A self-diagnosing gas density relay and its usage method

Abstract

The present application provides a self-diagnosing gas density relay and a method for using the same. The gas density relay includes a gas density relay body, a gas density detection sensor, at least one diagnostic sensor, and an intelligent control unit. Among them, the diagnostic sensor is configured to collect the amount of deformation of a component that deforms when the pressure, temperature, or gas density in the gas density relay body changes, and / or the position or displacement amount of a component that generates displacement. The intelligent control unit is respectively connected to the gas density detection sensor and the diagnostic sensor, receives the data collected by the gas density detection sensor and / or the diagnostic sensor, and diagnoses the current working state of the gas density relay body. The present application is used to monitor the gas density of electrical equipment for gas insulation or arc extinguishing, and at the same time, it also completes the on-line self-check of the gas density relay, improves efficiency, requires no maintenance, greatly reduces the operation and maintenance cost, and ensures the safe operation of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power, and particularly relates to a self-diagnosing gas density relay applied to high-voltage and medium-voltage electrical equipment and a using method thereof. Background Art

[0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in the power sector, industrial and mining enterprises, promoting the rapid development of the power industry. In recent years, with the rapid economic development, the capacity of China's power system has expanded sharply, and the consumption of SF6 electrical equipment has been increasing. The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment decreases and the micro water content exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment: 1) When the density of SF6 gas decreases to a certain extent, the insulation and arc extinguishing performance will be lost. 2) In the presence of some metal substances, SF6 gas can react with water at a temperature above 200°C to generate active HF and SOF2, corrode the insulation parts and metal parts, and generate a large amount of heat, causing the gas chamber pressure to rise. 3) When the temperature drops, excessive moisture may form condensed water, significantly reducing the insulation strength of the surface of the insulation parts, and even causing flashover, resulting in serious hazards. Therefore, the grid operation regulations compulsorily stipulate that the density and water content of SF6 gas must be regularly detected before the equipment is put into operation and during operation.

[0003] With the development of unattended substations towards networking and digitization and the continuous strengthening of the requirements for remote control and remote measurement, the on-line monitoring of the gas density and micro water content status of SF6 electrical equipment has important practical significance. With the continuous vigorous development of China's smart grid, intelligent high-voltage electrical equipment, as an important part and key node of intelligent substations, plays a crucial role in the safety of the smart grid. Most high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as caused by leakage, etc.), it will seriously affect the electrical performance of the equipment and pose a serious hidden danger to safe operation. At present, it is very common to on-line monitor the gas density value in SF6 high-voltage electrical equipment. The existing gas density monitoring systems (gas density relays) are basically: 1) Applying a remote transmission type SF6 gas density relay to collect, upload density, pressure and temperature, and realize on-line monitoring of gas density. 2) Applying a gas density transmitter to collect, upload density, pressure and temperature, and realize on-line monitoring of gas density. The SF6 gas density relay is the core and key component, and the remote transmission type SF6 gas density relay or gas density transmitter is the core and key component. It is very crucial to ensure its normal operation.

[0004] Regular inspection of the gas density relay on electrical equipment is a necessary measure to prevent problems before they occur and ensure the safe and reliable operation of electrical equipment. Both the "Power Preventive Test Regulations" and the "Twenty-five Key Requirements for Preventing Major Power Production Accidents" require regular calibration of the gas density relay. From the actual operation situation, regular calibration of the gas density relay is one of the necessary means to ensure the safe and reliable operation of power equipment. In addition, if calibrating or inspecting an on-line gas density monitoring device or a remote transmission density relay, a large amount of manpower and material resources are required.

[0005] Therefore, there is a great need to invent a self-diagnostic gas density relay or gas density monitoring device, which is applied to the gas density monitoring system based on the ubiquitous power Internet of Things, can realize on-line self-checking and calibration of the gas density relay, achieve maintenance-free, improve efficiency and ensure safety. Summary of the Invention

[0006] The present invention provides a self-diagnostic gas density relay (gas density monitoring device) for high-voltage or medium-voltage electrical equipment and its use method. While monitoring the gas density of electrical equipment for gas insulation or arc extinguishing, it also completes on-line self-checking and calibration of the gas density relay, improves efficiency, requires no maintenance, reduces operation and maintenance costs, and ensures the safe operation of the power grid.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The first aspect of the present application provides a self-diagnostic gas density relay, including: a gas density relay body, a gas density detection sensor, at least one diagnostic sensor, and an intelligent control unit;

[0009] The gas density relay body includes: a housing, and a pressure detection element, a temperature compensation element, a signal generator, and a signal action mechanism provided in the housing;

[0010] The gas density detection sensor is connected to the gas density relay body in the gas path and is used to collect pressure values, temperature values, and / or gas density values;

[0011] The diagnostic sensor is arranged in the housing of the gas density relay body and is configured to collect the deformation amount of the component that generates deformation when the pressure, temperature, or gas density in the gas density relay body changes, and / or the position or displacement amount of the component that generates displacement;

[0012] The intelligent control unit is respectively connected to the gas density detection sensor and the diagnostic sensor, and is configured to receive the data collected by the gas density detection sensor and / or the diagnostic sensor. By judging whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold value, or comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value, to diagnose whether the current working state of the gas density relay body is normal; or, the intelligent control unit is configured to upload the received data to the background, and the background diagnoses whether the current working state of the gas density relay body is normal by judging whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold value, or comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value.

[0013] The second aspect of the present application provides a self-diagnostic gas density monitoring device, including: a gas density relay body, a gas density detection sensor, at least one diagnostic sensor, and an intelligent control unit;

[0014] The gas density relay body includes: a housing, and a pressure detection element, a temperature compensation element, a signal generator, and a signal action mechanism arranged in the housing;

[0015] The gas density detection sensor is communicated with the gas density relay body in the gas path, and is used to collect pressure values, temperature values, and / or gas density values;

[0016] The diagnostic sensor is arranged in the housing of the gas density relay body, and is configured to collect the deformation amount of the component that deforms when the pressure change, or temperature change, or gas density change occurs in the gas density relay body, and / or the position or displacement amount of the component that generates displacement;

[0017] The intelligent control unit is respectively connected to the gas density detection sensor and the diagnostic sensor, and is configured to receive the data collected by the gas density detection sensor and / or the diagnostic sensor. By judging whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold value, or comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value, to diagnose whether the current working state of the gas density relay body is normal; or, the intelligent control unit is configured to upload the received data to the background, and the background diagnoses whether the current working state of the gas density relay body is normal by judging whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold value, or comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value.

[0018] Preferably, the diagnostic sensor is arranged on the pressure detection element; or,

[0019] The diagnostic sensor is disposed on the temperature compensation element; or,

[0020] The diagnostic sensor is disposed on the signal actuating mechanism; or,

[0021] There are two diagnostic sensors, one of which is disposed on the pressure detection element and the other is disposed on the temperature compensation element.

[0022] Preferably, the diagnostic sensor includes one or more of a displacement sensor, a magnetic sensor, a gravity sensor, a pressure sensor, a deformation amount sensor, a distance measuring sensor, an optoelectronic sensor, an angle sensor, an ultrasonic sensor, an infrared sensor, a strain gauge sensor, and a camera.

[0023] Preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or, the gas density relay body and the gas density detection sensor are a remote gas density relay of an integrated structure.

[0024] Preferably, the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter of an integrated structure.

[0025] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter composed of a pressure sensor and a temperature sensor is adopted; or, a density detection sensor using quartz tuning fork technology is adopted.

[0026] More preferably, the pressure sensor is installed on the gas path of the gas density relay body; the temperature sensor is installed on the gas path of the gas density relay body or outside the gas path, or inside the gas density relay body, or outside the gas density relay body.

[0027] More preferably, the pressure sensor includes a relative pressure sensor and / or an absolute pressure sensor.

[0028] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and the temperature value collected by the gas density detection sensor to complete the on-line monitoring of the gas density of the electrical equipment monitored by the gas density relay.

[0029] Preferably, the signal generator includes a microswitch or a magnetic-assisted electric contact, and the gas density relay body outputs a contact signal (alarm and / or locking) through the signal generator; the pressure detector includes a Bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or a gas enclosed in a housing.

[0030] Preferably, the diagnostic sensor detects the deformation amount of the temperature compensation element relative to its external dimension at 20°C. The intelligent control unit or the background determines whether the deformation amount is within a preset threshold. If the deformation amount is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or,

[0031] Pre-generate a data table for the correspondence between the temperature change value △T of each historical detected ambient temperature T relative to 20°C and the preset standard value of the deformation amount △L of the corresponding temperature compensation element. The intelligent control unit or the background calculates the difference, i.e., the error, between the deformation amount of the temperature compensation element detected by the diagnostic sensor under the current temperature change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within a preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Wherein, △T = │T - 20│°C, △L = │L T -L 20 │, L T is the external dimension corresponding to the temperature compensation element at the ambient temperature T, and L 20 is the external dimension corresponding to the temperature compensation element at 20°C.

[0032] Preferably, the diagnostic sensor detects the position of the temperature compensation element under a set gas density value. The intelligent control unit or the background determines whether the position is within a preset threshold. If the position is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or,

[0033] Pre-generate a data table for the correspondence between each historical detected gas density value and the preset standard value of the position of the corresponding temperature compensation element. The intelligent control unit or the background calculates the difference, i.e., the error, between the position of the temperature compensation element detected by the diagnostic sensor under the current gas density and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within a preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or,

[0034] The diagnostic sensor detects the displacement amount generated by the temperature compensation element when the gas density changes. The intelligent control unit or the background determines whether the displacement amount is within a preset threshold. If the displacement amount is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or,

[0035] Pre - generate a data table for the correspondence between each historically detected gas density change value and the preset standard value of the displacement of the corresponding temperature compensation element; the intelligent control unit or the background calculates the difference, that is, the error, between the displacement of the temperature compensation element detected by the diagnostic sensor under the current gas density change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state.

[0036] Preferably, the diagnostic sensor detects the position of the pressure detection element under a set gas pressure value, and the intelligent control unit or the background determines whether the position is within the preset threshold. If the position is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state; or,

[0037] Pre - generate a data table for the correspondence between each historically detected gas pressure value and the preset standard value of the position of the corresponding pressure detection element; the intelligent control unit or the background calculates the difference, that is, the error, between the position of the pressure detection element detected by the diagnostic sensor under the current gas pressure and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state; or,

[0038] The diagnostic sensor detects the displacement amount generated by the pressure detection element when the gas pressure changes, and the intelligent control unit or the background determines whether the displacement amount is within the preset threshold. If the displacement amount is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state; or,

[0039] Pre - generate a data table for the correspondence between each historically detected gas pressure change value and the preset standard value of the displacement of the corresponding pressure detection element; the intelligent control unit or the background calculates the difference, that is, the error, between the displacement of the pressure detection element detected by the diagnostic sensor under the current gas pressure change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state.

[0040] Preferably, the diagnostic sensor detects the position of the signal action mechanism under a set gas density value, and the intelligent control unit or the background determines whether the position is within the preset threshold. If the position is within the preset threshold, the current working state of the signal action mechanism is the normal working state; otherwise, it is the abnormal working state; or,

[0041] Generate a data table for the correspondence between each historically detected gas density value and the preset standard value of the position of the signal operating mechanism corresponding thereto; the intelligent control unit or the background calculates the difference, that is, the error, between the position of the signal operating mechanism detected by the diagnostic sensor under the current gas density and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the signal operating mechanism is the normal working state; otherwise, it is the abnormal working state; or,

[0042] The diagnostic sensor detects the displacement generated by the signal operating mechanism when the gas density value changes. The intelligent control unit or the background determines whether the displacement is within the preset threshold. If the displacement is within the preset threshold, the current working state of the signal operating mechanism is the normal working state; otherwise, it is the abnormal working state; or,

[0043] Pre-generate a data table for the correspondence between each historically detected gas density change value and the preset standard value of the displacement of the signal operating mechanism corresponding thereto; the intelligent control unit or the background calculates the difference, that is, the error, between the displacement of the signal operating mechanism detected by the diagnostic sensor under the current gas density change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the signal operating mechanism is the normal working state; otherwise, it is the abnormal working state.

[0044] Preferably, the gas density relay or the gas density monitoring device further includes: a driving contact operating mechanism, which is arranged inside or outside the housing of the gas density relay body and is connected to the intelligent control unit; the driving contact operating mechanism includes a force applying mechanism and a moving mechanism, the force applying mechanism includes a driving component and a force transmitting member driven by the driving component, the moving mechanism includes a push rod, and the push rod moves under the drive of the force applying mechanism to apply a force to the gas density relay body, directly or indirectly causing the signal operating mechanism to displace, so as to trigger the signal generator to generate a contact signal action; wherein, the contact signal includes alarm and / or locking.

[0045] More preferably, the driving component includes one of magnetic force, gravity, motor, electric push rod motor, stepping motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure generating pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic component, magnetic coupling thrust mechanism, heating generating thrust mechanism, electric heating generating thrust mechanism, chemical reaction generating thrust mechanism.

[0046] More preferably, the force transmitting member includes one of a cam, a connecting rod, a spring, a metal member, a non-metal member, a telescopic member, a non-telescopic member.

[0047] More preferably, the gas density relay body further includes a base, an end seat, and a movement mechanism disposed inside the housing; the movement mechanism is fixed on the base; the pressure detection element is a Bourdon tube, one end of which is fixed on the base and communicated therewith, and the other end is connected to one end of the temperature compensation element through the end seat, and a signal action mechanism is provided at the other end of the temperature compensation element; an adjusting screw or a trigger for pushing the signal generator to make the contacts of the signal generator connect or disconnect is provided on the signal action mechanism, and the gas density relay body outputs a contact signal through the signal generator; the driving contact action mechanism is disposed outside the housing of the gas density relay body, and the driving contact action mechanism further includes an outer cover with an opening, the outer cover is fixedly connected to the housing, and the opening faces the housing, and the driving component, the force transmission member, and the push rod are disposed inside the outer cover.

[0048] Further, one end of the push rod facing the force applying mechanism passes through a fixing bracket, the fixing bracket is fixedly arranged on the housing of the gas density relay body, and after the end of the push rod away from the force applying mechanism extends out of the opening of the outer cover, it extends into the housing through a pore on the housing of the gas density relay body; the end of the push rod extending into the housing is disposed opposite to the pressure detection element inside the housing.

[0049] Furthermore, a return spring is sleeved on the push rod between the fixing bracket and the pore.

[0050] Specifically, the force transmission member is a cam, the end face of the cam opposite to the convex portion of the cam contacts with one end of the push rod facing the force transmission member, and the return spring is in a natural extension state; the driving component drives the cam to rotate, the convex portion of the cam strikes the push rod, driving the push rod to move in its axial direction, and when the convex portion of the cam leaves the end of the push rod facing the force transmission member, the push rod is reset under the elastic force of the return spring.

[0051] Further, the movement mechanism includes a sector gear and a central gear, the first end of the sector gear meshes with the central gear, and the second end of the sector gear is connected to the other end of the temperature compensation element through a connecting rod or directly; the second end of the sector gear is fixedly connected to one end of a sector gear contact member, and the other end of the sector gear contact member extends out of the housing through a pore on the housing of the gas density relay body and is disposed opposite to the end of the push rod of the driving contact action mechanism away from the force applying mechanism.

[0052] Further, the force application mechanism applies a force to the sector gear contact member through the push rod, causing a displacement at the second end of the sector gear. The second end of the sector gear drives the temperature compensation element to generate a displacement through the connecting rod. The first end of the sector gear meshing with the central gear drives the central gear to rotate. The central gear and the pointer are both mounted on the drive rod, and the rotation of the central gear drives the drive rod to rotate, causing the pointer to move and indicate on the scale.

[0053] More preferably, the gas density relay body includes a first bellows provided in the housing as a pressure detection element, and also includes a second bellows. The first open end of the first bellows is fixed to the inner wall of the housing. The second open end of the first bellows is hermetically connected to a first seal. The inner wall of the first bellows, the first seal, and the inner wall of the housing together enclose a first sealed gas chamber, and the first sealed gas chamber is provided with an interface communicating with the insulating gas of the electrical equipment. The first open end of the second bellows is hermetically connected to the first seal. The second open end of the second bellows is connected to the inner wall of the housing through a second seal. The outer wall of the first bellows, the first seal, the outer wall of the second bellows, the second seal, and the inner wall of the housing together enclose a second sealed gas chamber, and the second sealed gas chamber is filled with a standard compensation gas, forming a temperature compensation element. The inner wall of the second bellows, the second seal, and the inner wall of the housing together enclose a third gas chamber. The signal generator and the signal action mechanism are arranged in the third gas chamber. The signal action mechanism is connected to the first seal, and the signal generator is arranged corresponding to the signal action mechanism. The driving contact action mechanism is arranged in the housing of the gas density relay body. A fixing member is provided at one end of the push rod close to the force transmission member. The end of the push rod far from the force transmission member penetrates through a fixing bracket fixed to the inner wall of the housing and extends below the fixing bracket to be arranged opposite to the signal action mechanism.

[0054] Further, the outer diameter of the first bellows is larger than the outer diameter of the second bellows.

[0055] Further, the signal action mechanism includes a moving rod. One end of the moving rod extends into the second bellows, is connected to the first seal, and generates a displacement along with the deformation of the first bellows. The other end of the moving rod extends out of the second bellows and is fixedly connected to an adjusting fixing member. An adjusting screw is provided on the adjusting fixing member, and the adjusting screw is used to touch the signal generator under the driving force of the moving rod.

[0056] Further, a return spring is sleeved on the push rod between the fixing member and the fixing bracket.

[0057] More preferably, the intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and the displacement D collected by the diagnostic sensor, calculates or converts the corresponding pressure value P2 according to the displacement D, and calculates the equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P, and according to the gas pressure-temperature characteristic, convert it into a pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online calibration of the gas density relay; or,

[0058] The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched. 20 , and the displacement D collected by the diagnostic sensor, combined with the temperature value T collected by the temperature sensor, are calculated or converted into the corresponding gas density value P2 20 , and according to the gas density value P1 20 And gas density value P2 20 Calculate the gas density value P 20 , complete the online calibration of the gas density relay.

[0059] Furthermore, when the gas density relay body generates a contact signal action or switching, its equivalent gas pressure value P = P1-P2; according to the equivalent gas pressure value P, and according to the gas pressure-temperature characteristic, it is converted into a pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online calibration of the gas density relay; or, when the gas density relay body has a contact signal action or switching, its equivalent gas pressure value P = P1-P2*K, where K is a preset coefficient; according to the equivalent gas pressure value P, and according to the gas pressure-temperature characteristics, it is converted into a pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online calibration of the gas density relay.

[0060] Furthermore, when the gas density relay body generates a contact signal action or switching, its gas density value P 20 And gas density value P1 20 、P2 20 The corresponding relationship between them is preset into a data table, and according to the gas density value P1 20 And gas density value P2 20 Query the data table to obtain the corresponding gas density value P 20 , complete the online verification of the gas density relay; or, when the gas density relay body has a contact signal action or switching, its gas density value P 20The correspondence relationship between the gas pressure values P1, P2 and the temperature value T is preset as a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1, P2 and the temperature value T 20 , and the online calibration of the gas density relay is completed.

[0061] More preferably, the gas density relay or the gas density monitoring device further includes a force sensor, which is arranged on the driving contact operating mechanism or in the housing and is connected to the intelligent control unit, and is configured to detect the magnitude of the force exerted on the gas density relay body by the driving contact operating mechanism.

[0062] Furthermore, the force sensor includes one of a gravity sensor, a pressure sensor, a magnetic sensor, a displacement sensor, a deformation sensor, an optoelectronic sensor, an angle sensor, and a camera.

[0063] Furthermore, the force sensor is arranged on the push rod of the driving contact operating mechanism; or,

[0064] the force sensor is arranged on the pressure detection element; or,

[0065] the force sensor is arranged on the temperature compensation element; or,

[0066] the force sensor is arranged on the signal operating mechanism.

[0067] Furthermore, when the gas density relay body generates a contact signal action or switching, the intelligent control unit obtains the pressure value P1 and the temperature value T collected by the gas density detection sensor, and the signal value F collected by the force sensor is calculated and converted into a corresponding equivalent pressure value P3, and the equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P3; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , and the online calibration of the gas density relay is completed; or,

[0068] The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the gas density relay body generates a contact signal action or switching 20 , and the signal value F collected by the force sensor and the temperature value collected by the temperature sensor are calculated and converted into a corresponding equivalent gas density value P3 20 , and the gas density value P is calculated according to the gas density value P1 20 and the gas density value P3 20 to obtain the gas density value P 20 , and the online calibration of the gas density relay is completed.

[0069] Furthermore, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed; or, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3*M, where M is a preset coefficient; according to this equivalent gas pressure value P, temperature value T, and converted into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed.

[0070] Furthermore, when the contact signal of the gas density relay body acts or switches, its gas density value P 20 and gas density value P1 20 、P3 20 The corresponding relationship between them is pre-designed into a data table, and the corresponding gas density value P is queried from the data table according to the gas density value P1 20 and gas density value P3 20 , the online calibration of the gas density relay is completed; or, 20

[0071] When the contact signal of the gas density relay body acts or switches, its gas density value P 20 The corresponding relationship between it and the gas pressure values P1, P3 and the temperature value T is pre-designed into a data table, and the corresponding gas density value P is queried from the data table according to the gas pressure values P1, P3 and the temperature value T 20 , the online calibration of the gas density relay body is completed; or,

[0072] When the contact signal of the gas density relay body acts or switches, its gas density value P 20 The corresponding relationship between it and the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T is pre-designed into a data table, and the corresponding gas density value P is queried from the data table according to the gas pressure value P1, the signal value F collected by the force sensor and the temperature value T 20 , the online calibration of the gas density relay is completed; or,

[0073] When the contact signal of the gas density relay body acts or switches, its gas density value P 20The corresponding relationship between the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T is pre-designed as a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T. 20 , and the online calibration of the gas density relay is completed.

[0074] Preferably, the gas density relay or the gas density monitoring device further includes an online calibration contact signal sampling unit, which is respectively connected to the signal generator and the intelligent control unit of the gas density relay body, and is configured to sample the contact signal of the gas density relay body.

[0075] More preferably, the online calibration contact signal sampling unit includes an isolation sampling element, and the isolation sampling element is controlled by the gas density relay body or the intelligent control unit; in the non-calibration state, the online calibration contact signal sampling unit is electrically isolated from the contact signal of the gas density relay body through the isolation sampling element; in the calibration state, the online calibration contact signal sampling unit cuts off the contact signal control loop of the gas density relay body through the isolation sampling element and connects the contact of the gas density relay body to the intelligent control unit; wherein, the isolation sampling element includes one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optocoupler, and a thyristor.

[0076] More preferably, the online calibration contact signal sampling unit samples the contact signal of the gas density relay body to satisfy: the online calibration contact signal sampling unit has at least two independent sampling contacts, and can automatically complete the calibration of at least two contacts at the same time, and continuously measure without replacing the contacts or reselecting the contacts; wherein, the contacts include, but are not limited to, an alarm contact, an alarm contact + a locking contact, an alarm contact + a locking 1 contact + a locking 2 contact, an alarm contact + a locking contact + an overpressure contact.

[0077] More preferably, the test voltage of the action value or its switching value of the contact signal of the gas density relay body sampled by the online calibration contact signal sampling unit is not less than 24V, that is, during calibration, a voltage not less than 24V is applied between the corresponding terminals of the contact signal.

[0078] More preferably, the gas density relay or the gas density monitoring device further includes: a multi-way joint, and one or more of the gas density relay body, the gas density detection sensor, the online calibration contact signal sampling unit, and the intelligent control unit are arranged on the multi-way joint.

[0079] Preferably, the control of the intelligent control unit is through on-site control and / or through background control.

[0080] Preferably, a display mechanism for displaying the density of the insulating gas is further provided on the housing of the gas density relay body.

[0081] More preferably, the display mechanism includes a connecting rod, a movement, a pointer and a dial. The movement is connected to the signal action mechanism or the temperature compensation element through the connecting rod. The pointer is installed on the movement and is arranged in front of the dial. The pointer combines with the dial to display the gas density value; alternatively, the display mechanism includes a liquid crystal or / and a digital tube.

[0082] Furthermore, the diagnostic sensor is arranged on the movement, or on the pointer, or on the connecting rod.

[0083] Preferably, the gas density relay body includes, but is not limited to, a gas density relay compensated by a bimetal, a gas density relay compensated by gas, a gas density relay of a hybrid type compensated by a bimetal and gas; a completely mechanical gas density relay, a digital gas density relay, a gas density relay of a combined mechanical and digital type; a gas density relay with pointer display, a digital display gas density relay, a gas density switch without display or indication; an SF6 gas density relay, an SF6 mixed gas density relay, an N2 gas density relay.

[0084] Preferably, the gas density relay body outputs a comparison density value signal, and the comparison density value signal is connected to the intelligent control unit; alternatively, the gas density relay body outputs a comparison pressure value signal, and the comparison pressure value signal is connected to the intelligent control unit.

[0085] Preferably, the intelligent control unit is based on an embedded system embedded algorithm and control program of a microprocessor, and automatically controls the entire calibration process, including all peripherals, logics and input / outputs.

[0086] More preferably, the intelligent control unit is based on a general computer, an industrial control computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC, etc., an industrial control main board, an embedded main control board, etc., and is embedded with an algorithm and a control program to automatically control the entire calibration process, including all peripherals, logics and input / outputs.

[0087] Preferably, the intelligent control unit has an electrical interface, and the electrical interface completes the storage of test data, and / or the export of test data, and / or the printing of test data, and / or the data communication with the upper computer, and / or the input of analog and digital information.

[0088] More preferably, the gas density relay or gas density monitoring device supports basic information input, and the basic information includes one or several of the factory number, accuracy requirement, rated parameters, manufacturer, and operating position.

[0089] Preferably, the intelligent control unit further includes a communication module for realizing long-distance transmission of test data and / or verification results.

[0090] More preferably, the communication method of the communication module is a wired communication or wireless communication method.

[0091] Furthermore, the wired communication method includes, but is not limited to, one or several of RS232 bus, RS422 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable wire.

[0092] Furthermore, the wireless communication method includes, but is not limited to, one or several of NB-IOT, 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

[0093] Preferably, at least two of the gas density relays or gas density monitoring devices are sequentially connected to the remote background detection system through a hub and a protocol converter; wherein, the gas density relay or gas density monitoring device is arranged on the electrical equipment in its corresponding gas chamber.

[0094] More preferably, the hub adopts an RS485 hub.

[0095] More preferably, the protocol converter adopts an IEC61850 or IEC104 protocol converter.

[0096] The third aspect of the present application discloses a usage method of a self-diagnostic gas density relay, including:

[0097] In the normal working state, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment through the gas density detection sensor;

[0098] The diagnostic sensor collects the pressure change, or temperature change, or the deformation amount of the component that deforms when the gas density changes, and / or the position or displacement amount of the component that generates displacement in the gas density relay body, and sends the collected data to the intelligent control unit;

[0099] The intelligent control unit receives the data collected by the gas density detection sensor and / or the diagnostic sensor, and diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value; alternatively, the intelligent control unit uploads the received data to the background, and the background diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value.

[0100] Preferably, the gas density relay or the gas density monitoring device further includes a driving contact action mechanism, which is arranged inside or outside the housing of the gas density relay body and is connected to the intelligent control unit. The driving contact action mechanism is configured to apply a force to the gas density relay body to directly or indirectly displace the signal action mechanism and / or drive the gas density relay body to generate a contact signal action; the usage method further includes:

[0101] By controlling the driving contact action mechanism through the intelligent control unit, the gas density relay body generates a contact action, and the intelligent control unit can detect that the gas density relay body generates a contact action, thereby completing the online simulation or virtual verification of the gas density relay body.

[0102] More preferably, when the gas density relay body generates a contact signal action or switching, the intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor, and the displacement amount D collected by the diagnostic sensor, calculates or converts the displacement amount D into a corresponding pressure value P2, and calculates the equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P and the pressure value corresponding to 20°C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the online calibration of the gas density relay; or,

[0103] The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the gas density relay body generates a contact signal action or switching 20 , and the displacement amount D collected by the diagnostic sensor, combines the temperature value T collected by the temperature sensor, and calculates or converts it into a corresponding gas density value P2 20 , and calculates the gas density value P according to the gas density value P1 20 and the gas density value P2 20 to calculate the gas density value P 20, complete the on-line calibration of the gas density relay.

[0104] Further, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20 °C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , complete the on-line calibration of the gas density relay; or,

[0105] When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2 * K, where K is a preset coefficient; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20 °C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , complete the on-line calibration of the gas density relay; or,

[0106] When the contact signal of the gas density relay body acts or switches, its gas density value P 20 and the gas density value P1 20 、P2 20 The corresponding relationship between them is preset into a data table, and the corresponding gas density value P is queried from the data table according to the gas density value P1 20 and the gas density value P2 20 to complete the on-line calibration of the gas density relay; or, 20 When the contact signal of the gas density relay body acts or switches, its gas density value P

[0107] The corresponding relationship between the gas density value P, the gas pressure values P1, P2 and the temperature value T is preset into a data table, and the corresponding gas density value P is queried from the data table according to the gas pressure values P1, P2 and the temperature value T 20 to complete the on-line calibration of the gas density relay. 20 , complete the on-line calibration of the gas density relay.

[0108] More preferably, the gas density relay or the gas density monitoring device further includes a force sensor, the force sensor is arranged on the driving contact mechanism or arranged in the housing, and is connected to the intelligent control unit, and is configured to detect the force applied by the driving contact mechanism to the gas density relay body; the usage method further includes:

[0109] The intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches, and the signal value F collected by the force sensor is converted into the corresponding equivalent pressure value P3 through calculation, and the equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P3; according to the equivalent gas pressure value P, and converted into the pressure value corresponding to 20 °C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or,

[0110] The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches 20 , and the signal value F collected by the force sensor and the temperature value collected by the temperature sensor are converted into the corresponding equivalent gas density value P3 through calculation 20 , and the gas density value P is calculated according to the gas density value P1 20 and the gas density value P3 20 to complete the on-line calibration of the gas density relay. 20

[0111] Further, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3; according to the equivalent gas pressure value P, and converted into the pressure value corresponding to 20 °C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or,

[0112] When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3*M, where M is a preset coefficient; according to the equivalent gas pressure value P, temperature value T, and converted into the pressure value corresponding to 20 °C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or,

[0113] When the contact signal of the gas density relay body acts or switches, its gas density value P 20 and the gas density value P1 20 、P3 20 The corresponding relationship between them is pre-designed into a data table, and the corresponding gas density value P is queried according to the gas density value P1 20 and the gas density value P3 20 to complete the on-line calibration of the gas density relay; or, 20

[0114] ​​When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships among the gas density value P, the gas pressure values P1 and P3, and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1 and P3 and the temperature value T 20 , to complete the on-line calibration of the gas density relay body; or,

[0115] When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships among the gas density value P, the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay; or,

[0116] When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships among the gas density value P, the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay.

[0117] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0118] 1) Provide a self-diagnosing gas density relay, which can monitor the gas density of electrical equipment for gas insulation or arc extinguishing, and at the same time complete the on-line self-diagnosis of the gas density relay, improve the efficiency, eliminate the need for maintenance, reduce the operation and maintenance costs, and ensure the safe operation of the power grid.

[0119] 2) Provide a method for using a self-diagnosing gas density relay, which can support the normal operation of the above self-diagnosing gas density relay.

[0120] 3) Achieve maintenance-free for the gas density relay, and further realize the intelligent management of the entire life cycle of the gas density relay: repair only when there is a problem, and do not carry out maintenance services when there is no problem. Description of the Drawings

[0121] The accompanying drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0122] Figure 1 It is a schematic structural diagram of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the first embodiment;

[0123] Figure 2 It is a schematic structural diagram of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the second embodiment;

[0124] Figure 3 It is a schematic structural diagram of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the third embodiment;

[0125] Figure 4 It is a schematic structural diagram of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the fourth embodiment;

[0126] Figure 5 It is a schematic structural diagram of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the fifth embodiment;

[0127] Figure 6 It is a partial schematic diagram of a diagnostic sensor of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the sixth embodiment;

[0128] Figure 7 It is a partial schematic diagram of a diagnostic sensor of a self-diagnosing gas density relay or gas density monitoring device for high and medium voltage electrical equipment in the seventh embodiment;

[0129] Figures 8 - 9 It is a gas density monitoring system with self-diagnosis in the eighth embodiment. Specific implementation manners

[0130] To make the objectives, technical solutions and effects of the present invention clearer and more definite, the present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0131] Embodiment 1:

[0132] Such as Figure 1As shown in the figure, a self-diagnosing gas density relay or gas density monitoring device mainly includes: a gas density relay body 1, gas density detection sensors (i.e., a pressure sensor 2 and a temperature sensor 3), an intelligent control unit 7, and a diagnostic sensor 17 and a diagnostic sensor 19. Among them, the pressure sensor 2, the temperature sensor 3, and the intelligent control unit 7 are arranged on a joint 110 for connecting electrical equipment. In the gas path, the pressure sensor 2 of the gas density detection sensor is communicated with the gas density relay body 1. The pressure sensor 2, the temperature sensor 3, the diagnostic sensor 17, and the diagnostic sensor 19 are respectively connected to the intelligent control unit 7. The gas density relay or gas density monitoring device further includes a mutual self-calibration unit, and the data detected by the mutual self-calibration unit is compared through the intelligent control unit 7 to achieve maintenance-free; or, the data detected is compared through the intelligent control unit 7 and the mutual self-calibration unit to achieve maintenance-free. In this embodiment, the mutual self-calibration unit is composed of a comparison pressure value output signal and the pressure sensor 2.

[0133] Specifically, the gas density relay body 1 includes a housing 101, and a base 102, an end seat 108, a pressure detection element 103, a temperature compensation element 104, several signal generators 109, a signal action mechanism 111, a movement 105, a pointer 106, a connecting rod 112, and a dial 107 disposed within the housing 101. The diagnostic sensors 17 and 19 are disposed inside the housing 101 of the gas density relay body 1 and are respectively connected to the intelligent control unit 7. One end of the pressure detection element 103 is fixed on and communicated with the base 102, the other end of the pressure detection element 103 is connected to one end of the temperature compensation element 104 through the end seat 108, a signal action mechanism 111 is provided at the other end of the temperature compensation element 104, and an adjusting member (such as an adjusting screw) for pushing the signal generator 109 to make the contact of the signal generator 109 connect or disconnect is provided on the signal action mechanism 111. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected to the movement 105 through the connecting rod 112 or directly connected to the movement 105; the pointer 106 is installed on the movement 105 and is disposed in front of the dial 107, and the pointer 106 combines with the dial 107 to display the gas density value. In addition, the gas density relay body 1 may further include a digital device or a liquid crystal device with indication display. Wherein, the signal generator 109 includes a microswitch or a magnetic-assisted electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detection element 103 includes a Bourdon tube or a bellows, and a Bourdon tube is adopted in this embodiment; the temperature compensation element 104 adopts a temperature compensation sheet or the gas enclosed in the housing, and a temperature compensation sheet is adopted in this embodiment. The gas density relay body 1 of this embodiment may further include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch, or a gas pressure gauge.

[0134] The diagnostic sensor 17 is disposed on the temperature compensation element 104 inside the housing 101 and is in contact with or associated with the temperature compensation element 104 through a contact member 17A. The diagnostic sensor 17 is a displacement sensor (or a deformation amount sensor, or an optoelectronic sensor), and the diagnostic sensor 17 is configured to collect the deformation amount of the temperature compensation element 104 of the gas density relay body 1 and diagnose the current working state of the gas density relay body 1.

[0135] Its working principle: Specifically, in this case, the intelligent control unit 7 obtains the temperature value T collected by the temperature sensor 3 and the deformation amount △L (compared with the outer dimension at 20 °C) detected by the diagnostic sensor 17 for the temperature compensation element 104 at this temperature. For example, as Figure 1As shown, the temperature compensation element 104 elongates or shortens under the action of thermal expansion and contraction, compensating for the change in density value caused by the rise and fall of temperature. The external dimension of the temperature compensation element 104 at 20°C is L 20 , with the change in temperature, the external shape of the temperature compensation element 104 will change, and its external dimension becomes L T , that is, the deformation amount of the temperature compensation element 104 is ΔL = L T -L 20 . If this deformation amount ΔL is within its preset threshold, the current working state of the temperature compensation element 104 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. Further, for its temperature change value ΔT (ΔT = │T - 20│°C), the corresponding relationship between each temperature change value ΔT and the preset standard value of the deformation amount ΔL (ΔL = │L T -L 20 │) can be pre-generated into a data table; the intelligent control unit 7 obtains the deformation amount ΔL1 of the temperature compensation element 104 detected by the diagnostic sensor 17 under the current temperature change, queries the preset standard value ΔL2 of the deformation amount corresponding to the current temperature change value in the data table, calculates the difference |ΔL1 - ΔL2| between the detected deformation amount ΔL1 and the preset standard value ΔL2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, the current working state of the temperature compensation element 104 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is the abnormal working state.

[0136] The diagnostic sensor 19 is arranged at the end seat 108 inside the housing 101 and is in contact with or associated with the end seat 108 through the contact member 19A. The diagnostic sensor 19 is a displacement sensor (or deformation amount sensor, or photoelectric sensor, or ranging sensor), and the diagnostic sensor 19 is configured to collect the position or displacement amount of the end seat 108 of the gas density relay body 1 and diagnose the current working state of the gas density relay body 1. Specifically, in this case, the intelligent control unit 7 obtains, under the same gas pressure, the pressure value P collected by the pressure sensor 2 of the gas density detection sensor and the position or displacement amount ΔS detected by the diagnostic sensor 19 for the end seat 108 (for example, compared with when the pressure is zero). For example, as Figure 1As shown, when the pressure sensor 2 collects the pressure value P, the corresponding position detected by the diagnostic sensor 19 on the end seat 108 is at position A. If this position A is within its preset threshold, the current working state of the end seat 108 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. Alternatively, the corresponding relationship between each gas pressure value and the preset standard value of the position of the end seat 108 corresponding to it can be pre-designed into a data table. The intelligent control unit 7 obtains the position S1 of the end seat 108 detected by the diagnostic sensor 19 under the current gas pressure, queries the preset standard value S2 corresponding to the current gas pressure value in the data table, calculates the difference |S1 - S2| between the detected position S1 and the preset standard value S2 of the position, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, the current working state of the end seat 108 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. When calculating the pressure, in combination with the measurement principle of the density relay (absolute pressure or relative pressure), the atmospheric pressure can be combined for accurate calculation. Since the end seat 108 is welded to one end of the pressure detection element 103 (Bourdon tube in this case), it indirectly indicates that the current working state of the pressure detection element 103 (Bourdon tube in this case) is the normal working state; otherwise, it is the abnormal working state. Or, when the temperature T = T1, the pressure value P collected by the pressure sensor 2 T1 At this time, the corresponding position detected by the diagnostic sensor 19 on the end seat 108 is at position A; when the temperature T = T2, the pressure value P collected by the pressure sensor 2 T2 At this time, the corresponding position detected by the diagnostic sensor 19 on the end seat 108 is at position B. The distance between position A and position B is △S. That is to say, the change value △T caused by the temperature (△T = │T1 - T2│), and at the same time, the pressure value will also cause a corresponding pressure change value △P (△P = │P T1 -P T2 │), which further causes a corresponding displacement △S of the end seat 108. If this displacement amount △S is within its preset threshold, the current working state of the end seat 108 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. Since the end seat 108 is welded to one end of the pressure detection element 103 (Bourdon tube in this case), it indirectly indicates that the current working state of the pressure detection element 103 (Bourdon tube in this case) is the normal working state; otherwise, it is the abnormal working state. Or it can be said that the pressure change value △P generated by the change of the pressure value (△P = │P T1 -P T2│) causes the pressure detection element 103 (a Bourdon tube in this case) to undergo a corresponding deformation. If this deformation is within its preset threshold, it indicates that the current working state of the pressure detection element 103 (a Bourdon tube in this case) is the normal working state; otherwise, it is an abnormal working state. Alternatively, the correspondence between each pressure change value and the preset standard value of the displacement of its corresponding terminal block 108 can be pre-designed as a data table; the intelligent control unit 7 obtains the displacement ΔS1 of the terminal block 108 detected by the diagnostic sensor 19 under the current gas pressure change, queries the preset standard value ΔS2 corresponding to the current gas pressure change value in the data table, calculates the difference |ΔS1 - ΔS2| between the detected displacement ΔS1 and the preset standard value ΔS2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, then the current working state of the terminal block 108 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is an abnormal working state.

[0137] There can be multiple diagnostic sensors, one can be set on the pressure detection element, one on the temperature compensation element, one on the signal action mechanism, and even one on the signal generator.

[0138] The force application mechanism and the motion mechanism can also be integrally designed; alternatively, the driving component of the force application mechanism and the force transmission component driven by the driving component can also be integrally designed; the push rod of the motion mechanism generally refers to a pushing component, and the push rod (pushing component) moves under the drive of the force application mechanism, directly or indirectly causing the signal action mechanism to displace. The force transmission component generally refers to a force transmission part, including, but not limited to, one of a cam, a connecting rod, a spring, a metal part, a non-metal part, a telescopic part, and a non-telescopic part. The driving contact action mechanism can be arranged inside the housing of the gas density relay body. The end of the push rod passing through the fixing frame extends into the housing through the air hole on the housing of the gas density relay body. The push rod can be in sealed contact with the inner wall of the housing or can be not in contact; the push rod is arranged opposite to the pressure detection element, or the temperature compensation element, or the signal generator, or the signal action mechanism, or the push rod is directly or indirectly connected or in contact with the pressure detection element, or the temperature compensation element, or the signal generator, or the signal action mechanism. The force measurement sensor can also be connected to the pressure detection element, or the temperature compensation element, or the signal generator, or the signal action mechanism through a contact part or directly. The signal action mechanism is provided with a triggering part that pushes the signal generator to make the contacts of the signal generator connect or disconnect. Specifically, the triggering part completes the connection or disconnection of the contacts of the signal generator (specifically, a magnetic-assisted electric contact) according to the gas density value, and the gas density relay body outputs a contact signal through the signal generator (specifically, a magnetic-assisted electric contact).

[0139] Embodiment 2:

[0140] As shown in Figure 2 , a self-diagnostic gas density relay or gas density monitoring device mainly includes: a gas density relay body 1, gas density detection sensors (a pressure sensor 2 and a temperature sensor 3), an intelligent control unit 7, and a diagnostic sensor 17. Among them, the pressure sensor 2, the temperature sensor 3, and the intelligent control unit 7 are arranged on a joint 110 for connecting electrical equipment. In the gas path, the pressure sensor 2 of the gas density detection sensor is communicated with the gas density relay body 1. The pressure sensor 2, the temperature sensor 3, and the diagnostic sensor 17 are respectively connected to the intelligent control unit 7. The gas density relay or gas density monitoring device further includes a mutual self-calibration unit, and the data detected by the mutual self-calibration unit is compared through the intelligent control unit 7 to achieve maintenance-free; or, the data detected is compared through the intelligent control unit 7 and the mutual self-calibration unit to achieve maintenance-free. In this embodiment, the mutual self-calibration unit is composed of a comparison pressure value output signal and the pressure sensor 2.

[0141] Specifically, the gas density relay body 1 includes a housing 101, and a base 102, an end seat 108, a pressure detection element 103, a temperature compensation element 104, several signal generators 109, a signal action mechanism 111, a connecting rod 112, a movement 105, a pointer 106, and a scale 107 arranged in the housing 101. The diagnostic sensor 17 is arranged inside the housing 101 of the gas density relay body 1.

[0142] Significantly different from Embodiment 1, in this embodiment, the diagnostic sensor 17 is arranged at the signal action mechanism 111 inside the housing 101, and is in contact with or associated with the signal action mechanism 111 through a contact member 17A. The diagnostic sensor 17 is a displacement sensor (or a deformation amount sensor, or an optoelectronic sensor), and the diagnostic sensor 17 is configured to collect the corresponding position or displacement amount of the signal action mechanism 111 of the gas density relay body 1, and diagnose whether the current working state of the gas density relay body 1 is normal. Further, in this case, the intelligent control unit 7 obtains the density value P obtained by the pressure sensor 2 and the temperature sensor 3 of the gas density detection sensor under the same gas density 20 and the corresponding displacement amount △S detected by the diagnostic sensor 17 for the signal action mechanism 111 20 or the corresponding position. For example, as shown in Figure 2 , when the pressure value P collected by the pressure sensor 2 and the temperature value T collected by the temperature sensor 3, the corresponding density value P is obtained 20, at this time, the corresponding position detected by the diagnostic sensor 17 for the signal operating mechanism 111 is at position E. If this position E is within its preset threshold, then the current operating state of the signal operating mechanism 111 of the gas density relay or gas density monitoring device is the normal operating state; otherwise, it is the abnormal operating state. Or, the corresponding relationship between each gas density value and the preset standard value of the position of the signal operating mechanism 111 corresponding to it is pre-designed into a data table; the intelligent control unit 7 obtains the position S1 of the signal operating mechanism 111 detected by the diagnostic sensor 17 under the current gas density, queries the preset standard value S2 corresponding to the current gas density value in the data table, calculates the difference |S1 - S2| between the detected position S1 and the preset standard value S2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, then the current operating state of the signal operating mechanism 111 of the gas density relay or gas density monitoring device is the normal operating state; otherwise, it is the abnormal operating state. When calculating the density, in combination with the measurement principle of the density relay (absolute pressure or relative pressure), the atmospheric pressure can be combined for accurate calculation. Or, on a certain day D1, the density value P obtained by the pressure sensor 2 and the temperature sensor 3 20D1 when, the corresponding position detected by the diagnostic sensor 17 for the signal operating mechanism 111 is at position E; on another day D2, the density value P obtained by the pressure sensor 2 and the temperature sensor 3 20D2 when, the corresponding position detected by the diagnostic sensor 17 for the signal operating mechanism 111 is at position F; the distance between position E and position F is △S 20 , that is to say, the change value △P 20 (△P 20 =│P 20D1 -P 20D2 │) will cause the signal operating mechanism 111 to have a corresponding displacement. If this displacement amount △S 20 is within its preset threshold, then the current operating state of the signal operating mechanism 111 of the gas density relay or gas density monitoring device is the normal operating state; otherwise, it is the abnormal operating state. Or, the corresponding relationship between each density change value and the preset standard value of the displacement amount of the signal operating mechanism 111 corresponding to it is pre-designed into a data table; the intelligent control unit 7 obtains the displacement amount △S1 of the signal operating mechanism 111 detected by the diagnostic sensor 17 under the current gas density change, queries the preset standard value △S2 corresponding to the current gas density change value in the data table, calculates the difference |△S1 - △S2| between the detected displacement amount △S1 and the preset standard value △S2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, then the current operating state of the signal operating mechanism 111 of the gas density relay or gas density monitoring device is the normal operating state; otherwise, it is the abnormal operating state.

[0143] Similarly, the gas density relay or gas density monitoring device includes a diagnostic sensor 17, which is correspondingly arranged relative to the temperature compensation element 104, or the movement 105, or the pointer 106, or the connecting rod 112 of the gas density relay body 1. The diagnostic sensor 17 is a displacement sensor (or deformation amount sensor, or photoelectric sensor), and the diagnostic sensor 17 can also be configured to collect the corresponding position or / and displacement amount, or deformation amount of the temperature compensation element 104, or the movement 105, or the pointer 106, or the connecting rod 112 of the gas density relay body 1, and diagnose the current working state of the gas density relay body 1. The method is the same as that of the diagnostic sensor 17 monitoring through the signal action mechanism 111.

[0144] Embodiment 3:

[0145] As Figure 3 shown, the self-diagnostic gas density relay or gas density monitoring device of Embodiment 3 of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a driving contact action mechanism 15, an on-line calibration contact signal sampling unit 6, an intelligent control unit 7, and a diagnostic sensor 17. The on-line calibration contact signal sampling unit 6 and the intelligent control unit 7 are arranged on a connector 110 for connecting electrical equipment. The driving contact action mechanism 15 is arranged outside the housing 101.

[0146] Specifically, the gas density relay body 1 includes a housing 101, and a base 102, an end seat 108, a pressure detection element 103, a temperature compensation element 104, several signal generators 109, a movement 105, a pointer 106, and a scale 107 disposed inside the housing 101. Among them, one end of the pressure detection element 103 is fixed on the base 102 and communicates with it, the other end of the pressure detection element 103 is connected to one end of the temperature compensation element 104 through the end seat 108, a signal action mechanism 111 is provided at the other end of the temperature compensation element 104, and an adjusting member (such as an adjusting screw) for pushing the signal generator 109 to make the contact of the signal generator 109 connect or disconnect is provided on the signal action mechanism 111. The movement 105 is fixed on the base 102; the pointer 106 is installed on the movement 105 and is disposed in front of the scale 107, and the pointer 106 combines with the scale 107 to display the gas density value. The movement 105 contains a sector gear 1051 and a center gear, and the sector gear 1051 meshes with the center gear. The other end of the temperature compensation element 104 is connected to one end of the sector gear 1051 through a connecting rod 112. One end of the sector gear 1051 is fixedly connected to one end of a sector gear contact member 1051A, and the other end of the sector gear contact member 1051A extends out of the housing 101 through a pore of the housing 101 of the gas density relay body 1. When one end of the sector gear 1051 moves, the other end of the sector gear 1051 meshing with the center gear drives the center gear to rotate. The center gear and the pointer 106 are installed on a driving rod, and the rotation of the center gear drives the driving rod to rotate, causing the pointer 106 to move and indicate at a certain scale on the scale 107.

[0147] A pressure sensor 2 is disposed on the base 102, and a temperature sensor 3 is disposed inside the housing 101. The diagnostic sensor 17 is disposed at the temperature compensation element 104 inside the housing 101 and is in contact with or associated with the temperature compensation element 104 through a contact member 17A; alternatively, the diagnostic sensor 17 can also be disposed at the signal action mechanism 111 inside the housing 101 and is in contact with or associated with the signal action mechanism 111 through a contact member 17A. The pressure sensor 2, the temperature sensor 3, an on-line calibration contact signal sampling unit 6, and the diagnostic sensor 17 are respectively connected to an intelligent control unit 7; the on-line calibration contact signal sampling unit 6 is also connected to the signal generator 109.

[0148] What is different from the first embodiment is:

[0149] 1) The diagnostic sensor 17 described in this case is a displacement sensor (or deformation amount sensor, or photoelectric sensor). The diagnostic sensor 17 detects the corresponding position of the temperature compensation element 104. If this position is within its preset threshold, then the current working state of the temperature compensation element 104 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is an abnormal working state. Or, the gas density change value △P caused by the change of the gas density value 20 causes the temperature compensation element 104 to undergo a corresponding displacement, and the diagnostic sensor 17 detects this displacement amount △S 20 , the displacement amount △S 20 is within its preset threshold, then the current working state of the temperature compensation element 104 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is an abnormal working state. Or, the corresponding relationship between each density change value and the preset standard value of the displacement amount of its corresponding temperature compensation element 104 is pre-designed into a data table; the intelligent control unit 7 obtains the displacement amount △S1 of the temperature compensation element 104 detected by the diagnostic sensor 17 under the current gas density change, and queries the preset standard value △S2 corresponding to the current gas density change value in the data table, calculates the difference |△S1 - △S2| between the detected displacement amount △S1 and the preset standard value △S2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, then the current working state of the temperature compensation element 104 of the gas density relay or gas density monitoring device is the normal working state; otherwise, it is an abnormal working state. That is, the intelligent control unit 7 judges based on the density value collected under the same gas density and the corresponding position or / and displacement amount detected by the diagnostic sensor 17 for the temperature compensation element 104 to obtain whether the current working state of the monitoring part of the gas density relay is normal.

[0150] 2) The driving contact operating mechanism 15 is arranged outside the housing 101 and is oppositely arranged with respect to the sector gear contact 1051A of the movement 105 of the gas density relay body 1; the driving contact operating mechanism 15 is configured to apply a force to the sector gear 1051 of the gas density relay body 1, indirectly causing the signal operating mechanism 111 to generate a displacement, so that the adjusting member (such as an adjusting screw) on the signal operating mechanism 111 pushes the signal generator 109, causing the contacts of the signal generator 109 to be connected or disconnected, and driving the gas density relay body 1 to generate a contact signal action.

[0151] The driving contact operating mechanism 15 mainly includes a driving component 151, a push rod (force applying member) 153, and an outer cover 158; wherein the push rod (force applying member) 153 is disposed opposite to the sector gear contact member 1051A. When the driving component 151 does not apply force, the push rod (force applying member) 153 is away from the sector gear contact member 1051A, and the push rod 153 does not apply force to the sector gear contact member 1051A. During qualitative verification, the driving component 151 applies a force F to the sector gear contact member 1051A through the push rod 153, causing the sector gear 1051 to undergo a corresponding displacement. With the help of the connecting rod 112 and the temperature compensation element 104, the signal operating mechanism 111 is driven to generate a displacement, so that an adjusting member (such as an adjusting screw) on the signal operating mechanism 111 pushes the signal generator 109, causing the contacts of the signal generator 109 to be connected or disconnected, and driving the gas density relay body 1 to generate a contact signal operation. At the same time, the intelligent control unit 7 obtains the pressure value P1 collected by the pressure sensor and the temperature value T collected by the temperature sensor when the gas density relay body 1 generates a contact signal operation or switching, and according to the pressure value P1 and the temperature value T, and the pressure value corresponding to 20°C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the qualitative on-line verification of the gas density relay: It shows that the contacts of the gas density relay body 1 are capable of outputting contacts, indicating that its contact actuator is reliable, smooth, and feasible.

[0152] In this embodiment, the diagnostic sensor 17 is used to judge the corresponding position and / or displacement amount detected by the temperature compensation element 104 to obtain the current working state of the monitoring part of the gas density relay, and its accuracy is qualified; then, by driving the contact operating mechanism 15 to cause the components of the gas density relay body 1 to undergo corresponding displacements, and / or driving the gas density relay body 1 to generate a contact signal operation, it is verified that its contact actuator is normal.

[0153] Embodiment 4:

[0154] As Figure 4 shown, the self-diagnostic gas density relay or gas density monitoring device according to Embodiment 4 of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a driving contact operating mechanism 15, an on-line verification contact signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a diagnostic sensor 17, a force measuring sensor 18, and an electrical equipment joint 13. Among them, the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the on-line verification contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the multi-way joint 9.

[0155] Specifically, the gas density relay body 1 mainly includes: a housing, a first bellows 103 (i.e., a pressure detection element) inside the housing, a second bellows 113, a signal generator 109 (a micro switch in this embodiment), and a signal action mechanism 111. Among them, the first open end of the first bellows 103 is fixed on the inner wall of the housing, the second open end of the first bellows 103 is hermetically connected to a first seal 118, the inner wall of the first bellows 103, the first seal 118, and the inner wall of the housing together enclose a first sealed gas chamber G1, and the pressure sensor 2 is communicated with the first sealed gas chamber G1. The first sealed gas chamber G1 is communicated with the insulating gas of the electrical equipment 8 through a multi-way joint 9 and an electrical equipment joint 13. The first open end of the second bellows 113 is hermetically connected to the first seal 118, the second open end of the second bellows 113 is connected to the inner wall of the housing through a second seal 119, the outer wall of the first bellows 103, the first seal 118, the outer wall of the second bellows 113, the second seal 119, and the inner wall of the housing together enclose a second sealed gas chamber G2, and the second sealed gas chamber G2 is filled with a standard compensation gas with a density value of P 20BC of the standard compensation gas, that is, the second sealed gas chamber G2 is a temperature compensation standard gas chamber, constituting a temperature compensation element. The second pressure sensor 4 is arranged in the second sealed gas chamber G2 for detecting the gas pressure in the second sealed gas chamber G2. The inner wall of the second bellows 113, the second seal 119, and the inner wall of the housing together enclose a third gas chamber G3. The signal action mechanism 111 and the signal generator 109 are arranged in the third gas chamber G3. The signal action mechanism 111 is connected to the first seal 118, the signal generator 109 is arranged corresponding to the signal action mechanism 111, and the gas density relay body 1 outputs a contact signal through the signal generator 109. In this embodiment, the signal action mechanism 111 includes a moving rod. One end of the moving rod extends into the second bellows 113, is fixedly connected to the first seal 118, and generates a displacement along with the deformation of the first bellows 103; the other end of the moving rod extends out of the second bellows 113 and is fixedly connected to an adjusting and fixing member (such as a cross bar or a plate member), and an adjusting screw 10101 is arranged on the adjusting and fixing member, and the adjusting screw 10101 is arranged corresponding to the signal generator 109. By monitoring the gas density through the first sealed gas chamber G1 and the second sealed gas chamber G2, and combining with the signal generator 109 to realize the monitoring of the gas density. When the gas density is lower than or / and higher than the set gas density, an alarm or / and locking contact signal is output through the signal generator 109.

[0156] In this case, the diagnostic sensor 17 is arranged below the signal operating mechanism 111, opposite to the signal operating mechanism 111, and is in contact with or associated with the signal operating mechanism 111 through the contact 17A. The diagnostic sensor 17 is configured to collect the corresponding position and / or displacement of the signal operating mechanism 111 of the gas density relay body 1, and diagnose the current working state of the gas density relay body 1. The diagnostic sensor 17 detects the corresponding position of the signal operating mechanism 111. If this position is within its preset threshold, the current working state of the signal operating mechanism 111 of the gas density relay or the gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. Or, the density change value △P generated by the change of the gas density value 20 causes the signal operating mechanism 111 to have a corresponding displacement, and the diagnostic sensor 17 detects this displacement △S 20 , and the displacement △S 20 is within its preset threshold, then the current working state of the signal operating mechanism 111 of the gas density relay or the gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. Or, the corresponding relationship between each density change value and the preset standard value of the displacement of its corresponding signal operating mechanism 111 is pre-designed into a data table; the intelligent control unit 7 obtains the displacement △S1 of the signal operating mechanism 111 detected by the diagnostic sensor 17 under the current gas density change, and queries the preset standard value △S2 corresponding to the current gas density change value in the data table, and calculates the difference |△S1 - △S2| between the detected displacement △S1 and the preset standard value △S2, that is, the error, and determines whether this error is within the preset threshold. If this error is within the preset threshold, the current working state of the signal operating mechanism 111 of the gas density relay or the gas density monitoring device is the normal working state; otherwise, it is the abnormal working state. That is, the intelligent control unit 7 judges according to the density value collected under the same gas density and the corresponding position and / or displacement detected by the diagnostic sensor 17 for the signal operating mechanism 111, and obtains whether the current working state of the monitoring part of the gas density relay is normal.

[0157] The driving contact operating mechanism 15 is arranged above the signal operating mechanism 111 of the gas density relay body 1, and is configured to apply a force to the signal operating mechanism 111 to push the moving rod to move. The balance of the forces acting on the upper end surface of the first bellows 103 by the first sealed gas chamber G1 and the third gas chamber G3 is broken, and the first bellows 103 deforms with the movement of the moving rod, generating a certain displacement. The moving rod drives the adjusting screw 10101 to touch the button of the signal generator 109, and the signal generator 109 issues an alarm and a locking signal.

[0158] In this embodiment, the driving contact operating mechanism 15 includes a force applying mechanism and a motion mechanism, and the force applying mechanism drives the motion mechanism to move. Among them, the force applying mechanism includes a driving component 151 and a force transmitting component 152 driven by the driving component 151 (in this embodiment, it is a cam, and the cam rotates under the drive of the driving component 151); the motion mechanism includes a push rod 153. A fixing member 156 is provided at one end of the push rod 153 close to the force applying mechanism, and the other end of the push rod 153 passes through a fixing bracket 155 fixed in the housing of the gas density relay body 1 and faces the moving rod of the signal operating mechanism 111. A return spring 154 is sleeved on the push rod 153 between the fixing member 156 and the fixing bracket 155, that is, the push rod 153 makes a reciprocating motion in the vertical direction under the action of the force applying mechanism. The force measuring sensor 18 (in this case, a displacement sensor or a deformation amount sensor) is connected to the push rod 153 through a contact member 1501, or the force measuring sensor 18 can also be directly connected to the push rod 153. When the force applying mechanism does not apply force, under the action of the return spring 154, the push rod 153 moves away from the moving rod of the signal operating mechanism 111, and the push rod 153 does not apply force to the moving rod of the signal operating mechanism 111. When the force applying mechanism applies force, the push rod 153 is affected by the driving component 151 and the force transmitting component 152, and the force F it exerts on the return spring 154 can be obtained by detecting the deformation amount of the return spring 154 through the force measuring sensor 18 (F = L * N, where: L is the deformation amount, mm; N is the elastic coefficient, kg / mm). During calibration, the force transmitting component 152 rotates under the drive of the driving component 151, pushes the push rod 153 to move downward, and then applies a force F to the spring 154 and the signal operating mechanism 111, that is, the driving component 151 applies a force to the signal operating mechanism 111 through the force transmitting component 152, causing the gas density relay body 1 to generate a contact signal action.

[0159] The driving component 151 includes, but is not limited to, one of magnetic force, gravity, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure generating pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic component, magnetic coupling thrust mechanism, heating generating thrust mechanism, electric heating generating thrust mechanism, chemical reaction generating thrust mechanism; the force transmitting component 152 includes, but is not limited to, one of cam, connecting rod, spring, metal part, non-metal part, telescopic part, non-telescopic part. The force measuring sensor 18 is connected to the driving contact operating mechanism 15 or the signal operating mechanism 111; the force measuring sensor 18 is also connected to the intelligent control unit 7; the force measuring sensor 18 is configured to detect the force F exerted by the driving contact operating mechanism 15 on the signal operating mechanism 111; the force measuring sensor 18 includes, but is not limited to, one of gravity sensor, pressure sensor, magnetic force sensor, displacement sensor, deformation amount sensor, photoelectric sensor, angle sensor, deformation sheet sensor, force sensor, camera.

[0160] When the intelligent control unit 7 obtains that the contact signal of the gas density relay body 1 acts or switches, the pressure value P1 collected by the pressure sensor 2, the temperature value T collected by the temperature sensor 3, and the force F collected by the force sensor, calculates or converts the force F into the corresponding pressure value P2, and calculates the equivalent gas pressure value P based on the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P, and converts it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 to complete the on-line calibration of the gas density relay. Alternatively, when the intelligent control unit 7 obtains that the contact signal of the gas density relay body 1 acts or switches, the gas density value P1 collected by the pressure sensor 2 and the temperature sensor 3 20 , and the force F collected by the force sensor 18, combines the temperature value T collected by the temperature sensor, and calculates or converts it into the corresponding gas density value P2 20 , and calculates the gas density value P according to the gas density value P1 20 and the gas density value P2 20 to complete the on-line calibration of the gas density relay. Further, when the contact signal of the gas density relay body 1 acts or switches, its equivalent gas pressure value P = P1 - P2; according to the equivalent gas pressure value P, and converts it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 to complete the on-line calibration of the gas density relay; or, when the contact signal of the gas density relay body 1 acts or switches, its equivalent gas pressure value P = P1 - P2*M, where M is a preset coefficient obtained according to the characteristics of the density relay body; according to the equivalent gas pressure value P, the temperature value T, and converts it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 to complete the on-line calibration of the gas density relay. Or it can also be that when the contact signal of the gas density relay body 1 acts or switches, its gas density value P 20 and the gas density values P1 20 and P2 20 The corresponding relationship between them is pre-designed into a data table, and the corresponding gas density value P is queried from the data table according to the gas density value P1 20 and the gas density value P2 20 to complete the on-line calibration of the gas density relay; or, when the contact signal of the gas density relay body 1 acts or switches, its gas density value P 20 to complete the on-line calibration of the gas density relay; or, when the contact signal of the gas density relay body 1 acts or switches, its gas density value P 20 to complete the on-line calibration of the gas density relay; or, when the contact signal of the gas density relay body 1 acts or switches, its gas density value P 20The corresponding relationships between the gas pressure values P1, P2 and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1, P2 and the temperature value T. 20 , and the on-line calibration of the gas density relay body is completed.

[0161] In this embodiment, the diagnostic sensor 17 is used to judge the corresponding position and / or displacement detected by the signal action mechanism 111, so as to obtain the current working state of the monitoring part of the gas density relay, and its accuracy is qualified; then, the component of the gas density relay body 1 is displaced correspondingly by driving the contact action mechanism 15, and / or the contact signal of the gas density relay body 1 is driven to act, so as to verify that the actuator of its contact is normal.

[0162] Embodiment Five:

[0163] As Figure 5 shown, a gas density relay or gas density monitoring device with an on-line self-calibration function provided by Embodiment Five of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a simulated or virtual contact output signal 1012, a diagnostic sensor 17, a force sensor 18, a driving contact action mechanism 15, an on-line calibration contact signal sampling unit 6 and an intelligent control unit 7. Among them, the pressure sensor 2, the on-line calibration contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the joint 110 for connecting electrical equipment; in the gas path, the pressure sensor 2 is communicated with the gas density relay body 1; the force sensor 18 and the driving contact action mechanism 15 are arranged outside the housing 101 of the gas density relay body 1; the temperature sensor 3 is arranged in the housing 101 of the gas density relay body 1 and close to the temperature compensation element 104, or the temperature sensor 3 is directly arranged on the temperature compensation element 104; the pressure sensor 2, the temperature sensor 3, the on-line calibration contact signal sampling unit 6, the diagnostic sensor 17, the force sensor 18, and the driving contact action mechanism 15 are respectively connected to the intelligent control unit 7; the on-line calibration contact signal sampling unit 6 is also connected to the signal generator 109 of the gas density relay body 1.

[0164] The difference from Embodiment One is:

[0165] 1) The diagnostic sensor 17 is arranged on the right side (or below) of the pressure detection element 103 and is arranged opposite to the pressure detection element 103. The diagnostic sensor 17 is in contact with or associated with the pressure detection element 103 through the contact 17A. The diagnostic sensor 17 is configured to collect the corresponding position and / or displacement of the pressure detection element 103 of the gas density relay body 1, and diagnose whether the current working state of the gas density relay body 1 is normal. For the corresponding position detected by the diagnostic sensor 17 on the pressure detection element 103, if this position is within its preset threshold, then the current working state of the pressure detection element 103 of the gas density relay or the gas density monitoring device is a normal working state; otherwise, it is an abnormal working state. Or, the change value △P generated by the pressure change causes the pressure detection element 103 to have a corresponding displacement. The diagnostic sensor 17 detects this displacement amount △S. If the displacement amount △S is within its preset threshold, then the current working state of the pressure detection element 103 (Bourdon tube) of the gas density relay or the gas density monitoring device is a normal working state; otherwise, it is an abnormal working state. Or, the corresponding relationship between each pressure change value and the preset standard value of the displacement amount of its corresponding pressure detection element 103 is pre-designed into a data table; the intelligent control unit 7 obtains the displacement amount △S1 of the pressure detection element 103 detected by the diagnostic sensor 19 under the current gas pressure change, and queries the preset standard value △S2 corresponding to the current gas pressure change value in the data table, and calculates the difference |△S1 - △S2| between the detected displacement amount △S1 and the preset standard value △S2, that is, the error, and judges whether this error is within the preset threshold. If this error is within the preset threshold, then the current working state of the pressure detection element 103 of the gas density relay or the gas density monitoring device is a normal working state; otherwise, it is an abnormal working state. That is, the intelligent control unit 7 judges based on the pressure value collected under the same gas pressure and the corresponding position and / or displacement amount detected by the diagnostic sensor 17 on the pressure detection element 103, and obtains whether the current working state of the monitoring part of the gas density relay is normal.

[0166] 2) The driving contact operating mechanism 15 is arranged outside the housing 101 and is arranged corresponding to the pressure detection element 103 (Bourdon tube) of the gas density relay body 1; the driving contact operating mechanism 15 is configured to cause the signal operating mechanism 111 of the gas density relay body 1 to have a corresponding displacement, and further cause the gas density relay body 1 to have a contact signal operation.

[0167] The driving contact actuating mechanism 15 includes an outer cover 158 with an opening at one end, and a driving component 151, a force transmission member 152 (cam), a push rod 153, a spring 154, and a fixing bracket 155 disposed inside the outer cover 158. Among them, the opening of the outer cover 158 faces the housing 101 of the gas density relay body 1, and the push rod 153 is disposed opposite to the pressure detection element 103 (Bourdon tube) inside the housing 101. The force measurement sensor 18 (in this case, a pressure sensor, or a displacement sensor, or a deformation amount sensor, or a photoelectric sensor, or a strain gauge sensor) is disposed opposite to the pressure detection element 103 (Bourdon tube), wherein the force contact member 18A of the force measurement sensor 18 contacts the pressure detection element 103 (Bourdon tube), and the force F applied by the push rod 153 to the pressure detection element 103 (Bourdon tube) can be detected through the force measurement sensor 18.

[0168] The force transmission member 152 rotates under the drive of the driving component 151; the fixing bracket 155 is fixedly arranged on the housing 101 of the gas density relay body 1; one end of the push rod 153 close to the force transmission member 152 penetrates through the fixing bracket 155. After the end of the push rod 153 far from the force transmission member 152 extends out of the opening of the outer cover 158, it extends into the housing 101 through the air hole on the housing 101 of the gas density relay body 1 and is in sealed contact with the inner wall of the housing 101. The end of the push rod 153 extending into the housing 101 is disposed opposite to the pressure detection element 103 (Bourdon tube) inside the housing 101. A return spring 154 is sleeved on the push rod 153 between the fixing bracket 155 and the air hole of the housing 101. One end of the return spring 154 is fixedly connected to the fixing bracket 155, and the other end is fixedly connected to the housing 101. When the push rod 153 is in an unloaded state, the end face of the force transmission member 152 (cam) opposite to the convex portion of the force transmission member 152 (cam) contacts the end of the push rod 153 passing through the fixing bracket 155, the return spring 154 is in a natural extended state, and the portion of the push rod 153 extending into the housing 101 is located on one side of the pressure detection element 103 (Bourdon tube) of the gas density relay body 1 and does not contact the pressure detection element 103 (Bourdon tube), that is, the push rod 153 does not apply force to the pressure detection element 103 (Bourdon tube).

[0169] During verification, the driving component 151 (motor) drives the force transmission member 152 (cam) to rotate, and the raised portion of the force transmission member 152 (cam) hits the push rod 153, driving the push rod 153 to move along its axial direction. The push rod 153 applies a force F to the pressure detection element 103 (Baden tube), forcing the end seat 108 at the end of the pressure detection element 103 (Baden tube) to be displaced. With the help of the temperature compensation element 104, the signal action mechanism 111 is displaced, and the adjustment member (for example, the adjustment screw) on the signal action mechanism 111 pushes the signal generator 109 (for example, a micro switch), and the contacts of the signal generator 109 are connected, and a corresponding contact signal (alarm or lockout) is issued. Next, when the raised portion of the force transmission member 152 (cam) leaves the push rod 153 and passes through one end of the fixed frame 155, the push rod 153 is reset under the elastic force of the reset spring 154, and no longer applies force to the pressure detection element 103 (Baden tube), the temperature compensation element 104 is reset, the adjustment member moves away from the signal generator 109, the contact of the signal generator 109 is disconnected, and the contact signal (alarm or lockout) is released.

[0170] The intelligent control unit 7 obtains the pressure value P1 collected by the pressure sensor and the temperature value T collected by the temperature sensor when the contact signal of the gas density relay body 1 is actuated or switched, and the force F collected by the force sensor 18, calculates or converts the corresponding pressure value P2 according to the force F, and calculates the equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P, and according to the gas pressure-temperature characteristic, converts it into a pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online calibration of the gas density relay.

[0171] In this embodiment, the corresponding position and / or displacement detected by the pressure detection element 103 is judged by the diagnostic sensor 17 to obtain the current working state of the monitoring part of the gas density relay, and its accuracy is qualified; then, the contact action mechanism 15 is driven to make the elements of the gas density relay body 1 to undergo corresponding displacement, and / or the gas density relay body 1 is driven to generate a contact signal action to verify that its contact actuator is normal.

[0172] Embodiment six:

[0173] like Figure 6 As shown in FIG. 6 , a partial schematic diagram of a diagnostic sensor for a gas density relay or a gas density monitoring device with an online self-checking function provided by the sixth embodiment of the present invention. Figure 6As shown in the figure, the diagnostic sensor is the camera 20. The camera 20 is arranged inside or outside the housing of the gas density relay body 1. The camera 20 is disposed opposite to the pointer 106 and the scale dial 107, and the camera 20 is also connected to the intelligent control unit 7. The camera 20 obtains the pointer display value or digital display value of the gas density relay body 1 through face recognition technology, which is the first density value P Z20 , and the gas density value collected by the gas density detection sensor is the second density value P J20 . The intelligent control unit 7 or the background compares the first density value P Z20 with the second density value P J20 to obtain the density difference |P J20 - P Z20 |. If the density difference |P J20 - P Z20 | is within its preset threshold, the current working state of the monitoring part of the gas density relay or gas density monitoring device is the normal working state and no maintenance is required. Otherwise, it is an abnormal working state.

[0174] Embodiment Seven:

[0175] As Figure 7 shown, a partial schematic diagram of the diagnostic sensor for a gas density relay or gas density monitoring device with an online self-checking function provided in Embodiment Seven of the present invention. As Figure 7 shown, the diagnostic sensor is the photoelectric sensor 21. The photoelectric sensor 21 is arranged inside the housing of the gas density relay body 1 and is connected to the intelligent control unit 7. The photoelectric sensor 21 includes a receiving host 21B and a light-emitting member 21A. The receiving host 21B is arranged on the scale dial 107, and the light-emitting member 21A is arranged on the pointer 106. When the pointer 106 passes through the light-emitting member 21A of the photoelectric sensor 21, the receiving host 21B of the photoelectric sensor 21 cannot receive the light emitted by the light-emitting member 21A. At this time, the receiving host 21B emits a signal, and the intelligent control unit 7 knows that the pointer 106 is at the set density value P S20 , and at the same time the density value collected by the gas density detection sensor is P J20 . The intelligent control unit 7 or the background compares the density value P S20 with the density value P J20 to obtain the density difference |P J20 - P S20 |. If the density difference |P J20 - P S20 | is within its preset threshold, the current working state of the monitoring part of the gas density relay or gas density monitoring device is the normal working state and no maintenance is required. Otherwise, it is an abnormal working state.

[0176] This embodiment can also be designed as follows: The dial 107 is provided with an opening. When the photoelectric sensor 21 is not directly opposite to the pointer 106, the light emitted by the photoelectric sensor 21 is not immediately reflected back; when the photoelectric sensor 21 is directly opposite to the pointer 106, the light emitted by the photoelectric sensor 21 is immediately reflected back by the pointer 106. At this time, the photoelectric sensor 21 emits a signal, and the intelligent control unit 7 knows through this signal that the pointer 106 is at the set density value P S20 , and at the same time, the gas density value P collected by the gas density detection sensor J20 , the intelligent control unit 7 or the background compares the density value P S20 with the density value P J20 to obtain the density difference |P J20 - P S20 |; if the density difference |P J20 - P S20 | is within its preset threshold, the current working state of the monitoring part of the gas density relay or the gas density monitoring device is the normal working state and does not require maintenance; otherwise, it is an abnormal working state.

[0177] The above gas density relay can compare its error performance at different temperatures and different time periods. That is, comparisons within the same temperature range at different times are made to determine the performance of electrical equipment and gas density relays. It has comparisons for each historical period and comparisons between history and the present. It can also conduct a physical examination on the gas density relay. The gas density relay can be repeatedly calibrated multiple times (for example, 2 - 3 times), and its average value is calculated based on the calibration results each time. When necessary, the density relay can be calibrated online at any time.

[0178] The types of the above pressure sensor 2 are: absolute pressure sensor, relative pressure sensor, or both absolute pressure sensor and relative pressure sensor, and the quantity can be several. The form of the pressure sensor can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip - type pressure sensor, a coil - induced pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Bourdon tube), a resistive pressure sensor (such as a pressure measurement sensor with a slide - wire resistor attached to a Bourdon tube). It can be an analog pressure sensor or a digital pressure sensor. Pressure acquisition is achieved by various pressure - sensing elements such as pressure sensors and pressure transmitters, such as diffused silicon type, sapphire type, piezoelectric type, strain - gauge type (resistive strain - gauge type, ceramic strain - gauge type).

[0179] The above temperature sensor 3 can be: thermocouple, thermistor, semiconductor type; it can be contact type and non - contact type; it can be a thermal resistor and a thermocouple. In short, temperature acquisition can be achieved by various temperature - sensing elements such as temperature sensors and temperature transmitters.

[0180] The above-mentioned gas density relay body includes a density relay with indication (a density relay with pointer display, or a density relay with digital display, or a density relay with liquid crystal display), and a density relay without indication (i.e., a density switch).

[0181] The gas density relay has functions of pressure measurement, temperature measurement and software conversion. Without affecting the safe operation of electrical equipment, it can on-line detect the alarm and / or blocking contact action value and / or return value of the gas density relay. Of course, the return value of the alarm and / or blocking contact signal can also not be tested according to requirements.

[0182] The intelligent control unit 7 mainly completes the control of driving the contact action mechanism and signal acquisition, and can detect the pressure value and temperature value when the contact signal of the gas density relay body acts, and convert them into the pressure value P at 20 °C 20 (density value), that is, it can detect the contact action value P of the gas density relay D20 , and complete the calibration work of the gas density relay body. Or, it can directly detect the density value P when the contact signal of the gas density relay body acts D20, complete the calibration work of the gas density relay body, which is the most basic requirement. Of course, the intelligent control unit 7 can also achieve: storing test data; and / or exporting test data; and / or printing test data; and / or communicating data with the upper computer; and / or inputting analog and digital information. The intelligent control unit 7 further includes a communication module, and realizes the long-distance transmission of information such as test data and / or calibration results through the communication module. When the rated pressure value of the gas density relay body outputs a signal, the intelligent control unit 7 simultaneously collects the density value at that time to complete the calibration of the rated pressure value of the gas density relay. The gas density relay will automatically make a comparison and determination. If the error is large, an abnormal prompt will be issued: there is a problem with the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. That is, the gas density relay can complete the mutual calibration function of the pressure detector, pressure sensor, temperature sensor, or density transmitter, etc. of the gas density relay itself; it can complete the mutual calibration of the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. When the gas density relay completes the calibration of the gas density relay, it will automatically make a mutual comparison and judgment. If the error is large, an abnormal prompt will be issued: there is a problem with the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. That is, the gas density relay can complete the mutual calibration function of the pressure detector, or pressure sensor, temperature sensor, or density transmitter, etc. of the gas density relay itself. It has the ability of artificial intelligence proofreading; after completing the calibration work of the gas density relay, it can automatically generate a calibration report of the density relay. If there is an abnormality, it can automatically issue an alarm or send it to a designated receiver, such as sending it to a mobile phone; display the density value and calibration result on-site locally, or display the density value and calibration result through the background, and the specific method can be flexible; it has functions such as real-time online display of data such as density value, pressure value, temperature value, change trend analysis, historical data query, and real-time alarm; it can monitor the gas density value online, or the density value, pressure value, temperature value; it has a self-diagnosis function and can promptly notify abnormalities, such as disconnection, short-circuit alarm, sensor damage, etc.; it can compare the error performance of the gas density relay at different temperatures and different time periods, that is, compare in the same temperature range at different times, and make a judgment on the performance of the gas density relay. It has comparisons in various historical periods and comparisons between history and the present. It can also perform a self-inspection on the gas density relay; determine whether the density values of the gas density relay itself and the electrical equipment being monitored are normal.That is, it can judge, analyze and compare the density value of the electrical equipment itself, the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself, so as to realize the judgment, comparison and analysis of the gas density monitoring of the electrical equipment and the state of the gas density relay itself; it also includes an analysis system (expert management analysis system) to detect, analyze and judge the gas density monitoring, gas density relay and monitoring components, and know where the problem lies, whether it is the electrical equipment or the gas density relay itself; it also monitors the contact signal state of the gas density relay body and transmits its state remotely. It is possible to know the contact signal state of the gas density relay body in the background: whether it is open or closed, thus adding an extra layer of monitoring and improving reliability; it can also detect, or detect and judge the temperature compensation performance of the gas density relay body; it can also detect, or detect and judge the contact resistance of the contacts of the gas density relay body; it has data analysis and data processing functions and can perform corresponding fault diagnosis and prediction on electrical equipment.

[0183] As long as the detection data among the pressure sensor 2, temperature sensor 3, pressure detection element 103, temperature compensation element 104, etc. are consistent and normal, it indicates that the gas density relay itself is normal, and thus there is no need to use the traditional method for maintenance personnel to go to the site to calibrate the gas density relay, and it can be free of manual calibration throughout its life. Unless the detection data among the pressure sensor 2, temperature sensor 3, pressure detection element 103, temperature compensation element 104, etc. of a certain electrical equipment in the substation are inconsistent and abnormal, maintenance personnel will be arranged to handle it. For those that are consistent and normal, no manual calibration is required. In this way, the reliability and efficiency are greatly improved, and the cost is reduced.

[0184] Embodiment Eight:

[0185] Figures 8 - 9 It is a gas density monitoring system with self-diagnosis, and the gas density monitoring system includes the above-mentioned gas density relay or gas density monitoring device with self-diagnosis.

[0186] As Figure 8 shown, multiple electrical equipment with gas chambers, multiple self-diagnosis gas density relays or gas density monitoring devices are all connected to the remote background detection system through hubs and IEC61850 protocol converters in sequence; among them, the self-diagnosis gas density relays or gas density monitoring devices are respectively arranged on the electrical equipment corresponding to the gas chambers.

[0187] See Figure 8 and 9As shown, PC is the online monitoring background host and system, Gateway is the network switch, Server is the comprehensive application server, ProC is the protocol converter / online monitoring intelligent unit, HUB is the hub, and Z is the self-diagnosing gas density relay or gas density monitoring device. The online monitoring system architecture includes: detailed simple architecture ( Figure 8 ), conventional architecture ( Figure 9 ).

[0188] System architecture diagram and simple description: 1). Background software platform: Based on Windows, Linux, etc., or VxWorks, Android, Unix, Ucos, FreeRTOS, RTX, embOS, MacOS. 2). Key business modules and basic functions of the background software: Such as permission management, device management, data storage and query, etc.; as well as user management, alarm management, real-time data, historical data, real-time curve, historical curve, configuration management, data acquisition, data parsing, recording conditions, exception handling. 3). Interface configuration: Such as Form interface, Web interface, configuration interface, etc.

[0189] Specifically, as Figure 8 shown, the online monitoring background host and system PC communicate with multiple hubs HUB (HUB1, HUB2,..., HUBm) through hub HUB0. Each hub HUB connects a group of self-diagnosing gas density relays (or gas density monitoring devices) Z. For example, hub HUB1 connects self-diagnosing gas density relays (or gas density monitoring devices) Z11, Z12,..., Z1n, hub HUB2 connects self-diagnosing gas density relays (or gas density monitoring devices) Z21, Z22,..., Z2n,..., hub HUBm connects self-diagnosing gas density relays (or gas density monitoring devices) Zm1, Zm2,..., Zmn, where m and n are both natural numbers.

[0190] As Figure 9As shown in the figure, the online monitoring background host and the system PC are connected to two integrated application servers, Server1 and Server2, through a network switch, Gateway. The two integrated application servers, Server1 and Server2, communicate with multiple protocol converters / online monitoring intelligent units, ProC (ProC1, ProC2, …… ProCn), through the station control layer Network A and Network B. The protocol converters / online monitoring intelligent units, ProC, communicate with multiple hubs, HUB (HUB1, HUB2, …… HUBm), through the R5485 network. Each hub, HUB, is connected to a group of self-diagnosing gas density relays (or gas density monitoring devices), Z. For example, HUB1 is connected to self-diagnosing gas density relays (or gas density monitoring devices), Z11, Z12, …… Z1n, HUB2 is connected to self-diagnosing gas density relays (or gas density monitoring devices), Z21, Z22, …… Z2n, ……, HUBm is connected to self-diagnosing gas density relays (or gas density monitoring devices), Zm1, Zm2, …… Zmn, where m and n are both natural numbers.

[0191] In addition, it can also be an architecture with a wireless transmission method. For example, multiple integrated application servers, Server1, Server2, …… Server n, communicate wirelessly with each gas density relay through the cloud, Cluod, a wireless gateway, and the wireless modules of each gas density relay. Where n is a natural number.

[0192] Functions that can be achieved by the self-diagnosing gas density relay or gas density monitoring device: 1) Conduct online monitoring of gas density, or can achieve online monitoring of gas density and micro water, or can achieve online monitoring of gas density, micro water, and decomposition product content; 2) Online calibration of the density relay itself (the contact signal value and display value of the density relay can be calibrated online); 3) Through the mutual calibration of electronic detection (monitoring) and mechanical detection (monitoring), the reliable performance of the system can be achieved, and thus manual calibration can be avoided throughout the life cycle. Unless, the pressure sensor 2, temperature sensor 3, and the gas density relay body 1 of a certain electrical equipment in the substation do not match or are abnormal, then maintenance personnel are arranged to handle it. For those that match and are normal, no calibration is required. In this way, the reliability is greatly improved, the efficiency is increased, and the cost is reduced; 4) Even the zero position calibration of the pressure sensor 2 can be carried out.

[0193] The self-diagnosing gas density relay or gas density monitoring device has its own diagnostic function, can conduct self-diagnosis on each component, and diagnose the process, such as diagnosing the monitoring or calibration process; this gas density relay has the performance of self-calibration and comparison.

[0194] The self-diagnostic gas density relay or gas density monitoring device contains multiple pressure sensors and temperature sensors. The mutual verification of the test data of the multiple pressure sensors and temperature sensors, as well as the mutual verification of the test data of these sensors and the gas density relay body, ensure the normal operation of the gas density relay.

[0195] The self-diagnostic gas density relay or gas density monitoring device compares the transmitted ambient temperature value with the sampled value of the temperature sensor to complete the calibration of the temperature sensor.

[0196] The self-diagnostic gas density relay or gas density monitoring device, according to the gas density during monitoring, monitors the corresponding position or / and corresponding displacement or / and deformation amount of at least one element in the main elements of the gas density relay body through the diagnostic sensor, and diagnoses the current working state of the gas density relay body; or, according to the gas pressure during monitoring, monitors the corresponding position or / and corresponding displacement or / and deformation amount of at least one element in the main elements of the gas density relay body through the diagnostic sensor, and diagnoses the current working state of the gas density relay body; or, according to the temperature during monitoring, monitors the corresponding position or / and corresponding displacement or / and deformation amount of at least one element in the main elements of the gas density relay body through the diagnostic sensor, and diagnoses the current working state of the gas density relay body. The main elements of the gas density relay body may include: pressure detection element, temperature compensation element, signal generator, signal adjustment mechanism, movement, pointer. For example, the diagnostic sensor is arranged on the movement, or on the pointer, or on the connecting rod; or, the two diagnostic sensors, one is arranged on the pressure detection element and the other is arranged on the temperature compensation element. The intelligent control unit or the background judges according to the pressure value collected under the same gas pressure and the corresponding position or / and corresponding displacement or / and deformation amount detected by the diagnostic sensor for the pressure detection element; and / or, the intelligent control unit judges according to the temperature value collected under the same gas ambient temperature and the corresponding position or / and corresponding displacement or / and deformation amount detected by the diagnostic sensor for the temperature compensation element; or, the intelligent control unit judges according to the density value collected under the same gas density and the corresponding position or / and corresponding displacement or / and deformation amount detected by the diagnostic sensor for the signal adjustment mechanism or / and movement or / and pointer; to obtain the current working state of the monitoring part of the gas density relay. The movement is directly connected to the temperature compensation element for density value transmission.

[0197] It should be noted that the self-diagnostic gas density relay described in this application generally refers to the integrated design of its constituent elements; while the gas density monitoring device generally refers to the split design of its constituent elements for flexible composition. The gas temperature generally refers to the temperature in the gas or the corresponding ambient temperature. In addition to including that the corresponding differences are within their preset thresholds, the detected values are within their set ranges, and the division of two corresponding detected values is within its preset threshold, the diagnostic method in the present invention can also be completed by the intelligent control unit or / and the background for comparing the corresponding detection results, and the method can be flexible. The gas density relay can be technically transformed and upgraded by using the original gas density relay in the substation.

[0198] The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A self-diagnosing gas density relay, characterized in that, Comprising: A gas density relay body, a gas density detection sensor, at least one diagnostic sensor, an intelligent control unit, and a driving contact operating mechanism; The gas density relay body includes: a housing, and a pressure detection element, a temperature compensation element, a signal generator, and a signal operating mechanism disposed within the housing; The gas density detection sensor is in gas communication with the gas density relay body and is configured to collect pressure values, temperature values, and / or gas density values; The diagnostic sensor is disposed within the housing of the gas density relay body and is configured to collect the deformation amount of a component that deforms and / or the position or displacement amount of a component that generates displacement when there is a change in pressure, temperature, or gas density within the gas density relay body; The intelligent control unit is respectively connected to the gas density detection sensor and the diagnostic sensor, receives the data collected by the gas density detection sensor and / or the diagnostic sensor, and diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value; alternatively, the intelligent control unit uploads the received data to the background, and the background diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value; The driving contact operating mechanism is disposed within or outside the housing of the gas density relay body and is connected to the intelligent control unit; the driving contact operating mechanism includes a force application mechanism and a motion mechanism, the force application mechanism includes a driving component and a force transmission member driven by the driving component, the motion mechanism includes a push rod, and the push rod moves under the drive of the force application mechanism to apply a force to the gas density relay body, directly or indirectly causing the signal operating mechanism to displace, so as to trigger the signal generator to generate a contact signal action, and the contact signal includes an alarm and / or a lockout; The gas density relay body further includes any one of the following two structures: The first structure: The gas density relay body further includes a base, an end seat, and a movement mechanism disposed inside the housing; the movement mechanism is fixed on the base; the pressure detection element is a Bourdon tube, one end of which is fixed on and communicated with the base, and the other end is connected to one end of the temperature compensation element through the end seat, and a signal action mechanism is provided at the other end of the temperature compensation element; an adjusting screw or a trigger member for pushing the signal generator to make the contacts of the signal generator connect or disconnect is provided on the signal action mechanism, and the gas density relay body outputs contact signals through the signal generator; the driving contact action mechanism is disposed outside the housing of the gas density relay body, and the driving contact action mechanism further includes an outer cover with an opening, the outer cover is fixedly connected to the housing, and the opening faces the housing, and the driving member, the force transmission member, and the push rod are disposed inside the outer cover; Wherein, one end of the push rod facing the force application mechanism passes through a fixing frame, the fixing frame is fixedly disposed on the housing of the gas density relay body, and after the end of the push rod away from the force application mechanism extends out of the opening of the outer cover, it extends into the housing through a pore on the housing of the gas density relay body, and the end of the push rod extending into the housing is disposed opposite to the pressure detection element inside the housing; Or, The movement mechanism includes a sector gear and a central gear, the first end of the sector gear meshes with the central gear, the second end of the sector gear is connected to the other end of the temperature compensation element through a connecting rod or directly, the second end of the sector gear is fixedly connected to one end of a sector gear contact member, and the other end of the sector gear contact member extends out of the housing through a pore on the housing of the gas density relay body and is disposed opposite to the end of the push rod of the driving contact action mechanism away from the force application mechanism; Second structure: The gas density relay body includes a first bellows disposed in the housing as a pressure detection element, and further includes a second bellows. The first open end of the first bellows is fixed to the inner wall of the housing, and the second open end of the first bellows is hermetically connected to a first seal. The inner wall of the first bellows, the first seal, and the inner wall of the housing together enclose a first sealed gas chamber, and the first sealed gas chamber is provided with an interface communicating with the insulating gas of the electrical equipment. The first open end of the second bellows is hermetically connected to the first seal, and the second open end of the second bellows is connected to the inner wall of the housing through a second seal. The outer wall of the first bellows, the first seal, the outer wall of the second bellows, the second seal, and the inner wall of the housing together enclose a second sealed gas chamber, and the second sealed gas chamber is filled with a standard compensation gas to form a temperature compensation element. The inner wall of the second bellows, the second seal, and the inner wall of the housing together enclose a third gas chamber, and the signal generator and the signal operating mechanism are disposed in the third gas chamber. The signal operating mechanism is connected to the first seal, and the signal generator is disposed corresponding to the signal operating mechanism. The driving contact operating mechanism is disposed in the housing of the gas density relay body. A fixing member is provided at one end of the push rod close to the force transmission member. The end of the push rod far from the force transmission member penetrates through a fixing frame fixed to the inner wall of the housing and extends below the fixing frame to be disposed opposite to the signal operating mechanism.

2. The gas density relay according to claim 1, characterized in that: The diagnostic sensor is disposed on the pressure detection element; or, The diagnostic sensor is disposed on the temperature compensation element; or, The diagnostic sensor is disposed on the signal operating mechanism; or, There are two diagnostic sensors, one of which is disposed on the pressure detection element and the other is disposed on the temperature compensation element.

3. The gas density relay according to claim 1, wherein: The diagnostic sensor includes one or more of a displacement sensor, a magnetic sensor, a gravity sensor, a pressure sensor, a deformation amount sensor, a distance measuring sensor, an optical sensor, an angle sensor, an ultrasonic sensor, an infrared sensor, a strain gauge sensor, and a camera.

4. The gas density relay according to claim 1, characterized in that: The gas density relay body and the gas density detection sensor are of an integrated structure.

5. The gas density relay according to claim 4, wherein: The gas density relay body and the gas density detection sensor are a remote gas density relay of an integrated structure.

6. The gas density relay according to claim 1, wherein: The gas density detection sensor is of an integrated structure.

7. The gas density relay according to claim 6, characterized in that: The gas density detection sensor is an integrated gas density transmitter.

8. The gas density relay according to claim 1, characterized in that: The gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter composed of a pressure sensor and a temperature sensor is adopted; or, a density detection sensor using quartz tuning fork technology is adopted.

9. The gas density relay according to claim 8, characterized in that: The pressure sensor is installed on the gas path of the gas density relay body; the temperature sensor is installed on the gas path of the gas density relay body, outside the gas path, inside the gas density relay body, or outside the gas density relay body.

10. The gas density relay according to claim 1, characterized in that: The intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay.

11. The gas density relay according to claim 1, wherein: The signal generator includes a microswitch or a magnetic-assisted electrical contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes a Bourdon tube or a bellows; the temperature compensation element uses a temperature compensation sheet or a gas enclosed in the housing.

12. The gas density relay according to claim 1, wherein: The diagnostic sensor detects the deformation amount of the temperature compensation element relative to the outer dimension at 20°C, and the intelligent control unit or the background judges whether the deformation amount is within a preset threshold. If the deformation amount is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or, Generate a data table in advance for the correspondence between the temperature change value ΔT of each historical detected ambient temperature T relative to 20°C and the preset standard value of the deformation amount ΔL of the corresponding temperature compensation element; the intelligent control unit or the background calculates the difference, that is, the error, between the deformation amount of the temperature compensation element detected by the diagnostic sensor under the current temperature change and the corresponding preset standard value obtained by querying the data table, and determines whether this error is within the preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state; where ΔT = │T - 20│°C, ΔL = │L T -L 20 │, L T is the outer dimension corresponding to the temperature compensation element at the ambient temperature T, and L 20 is the outer dimension corresponding to the temperature compensation element at 20°C.

13. The gas density relay according to claim 1, wherein: The diagnostic sensor detects the position of the temperature compensation element at a set gas density value, and the intelligent control unit or the background judges whether the position is within a preset threshold. If the position is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or, The correspondence between each historically detected gas density value and the preset standard value of the position of the corresponding temperature compensation element is pre-generated into a data table; the intelligent control unit or the background calculates the difference, that is, the error, between the position of the temperature compensation element detected by the diagnostic sensor at the current gas density and the corresponding preset standard value obtained by querying the data table, and judges whether the error is within a preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or, The diagnostic sensor detects the displacement amount generated by the temperature compensation element when the gas density changes, and the intelligent control unit or the background judges whether the displacement amount is within a preset threshold. If the displacement amount is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state. Or, The correspondence between each historically detected gas density change value and the preset standard value of the displacement amount of the corresponding temperature compensation element is pre-generated into a data table; the intelligent control unit or the background calculates the difference, that is, the error, between the displacement amount of the temperature compensation element detected by the diagnostic sensor at the current gas density change and the corresponding preset standard value obtained by querying the data table, and judges whether the error is within a preset threshold. If the error is within the preset threshold, the current working state of the temperature compensation element is the normal working state; otherwise, it is the abnormal working state.

14. The gas density relay according to claim 1, characterized in that: The diagnostic sensor detects the position of the pressure detection element at a set gas pressure value, and the intelligent control unit or the background judges whether the position is within a preset threshold. If the position is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state. Or, Pre-generate a data table for the correspondence between each historically detected gas pressure value and the preset standard value of the position of the corresponding pressure detection element; the intelligent control unit or the background calculates the difference, that is, the error, between the position of the pressure detection element detected by the diagnostic sensor under the current gas pressure and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state; Or, The diagnostic sensor detects the displacement generated by the pressure detection element when the gas pressure changes. The intelligent control unit or the background determines whether the displacement is within the preset threshold. If the displacement is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state; Or, Pre-generate a data table for the correspondence between each historically detected gas pressure change value and the preset standard value of the displacement of the corresponding pressure detection element; the intelligent control unit or the background calculates the difference, that is, the error, between the displacement of the pressure detection element detected by the diagnostic sensor under the current gas pressure change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the pressure detection element is the normal working state; otherwise, it is the abnormal working state.

15. The gas density relay according to claim 1, wherein: The diagnostic sensor detects the position of the signal action mechanism under the set gas density value. The intelligent control unit or the background determines whether the position is within the preset threshold. If the position is within the preset threshold, the current working state of the signal action mechanism is the normal working state; otherwise, it is the abnormal working state; Or, Generate a data table for the correspondence between each historically detected gas density value and the preset standard value of the position of the corresponding signal action mechanism; the intelligent control unit or the background calculates the difference, that is, the error, between the position of the signal action mechanism detected by the diagnostic sensor under the current gas density and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the signal action mechanism is the normal working state; otherwise, it is the abnormal working state; Or, The diagnostic sensor detects the displacement generated by the signal action mechanism when the gas density value changes. The intelligent control unit or the background determines whether the displacement is within the preset threshold. If the displacement is within the preset threshold, the current working state of the signal action mechanism is the normal working state; otherwise, it is the abnormal working state; Or, Pre-generate a data table for the correspondence between the gas density change values detected in each history and the preset standard values of the displacement of the signal action mechanism corresponding thereto; the intelligent control unit or the background calculates the difference, i.e., the error, between the displacement of the signal action mechanism detected by the diagnostic sensor under the current gas density change and the corresponding preset standard value obtained by querying the data table, and determines whether the error is within the preset threshold. If the error is within the preset threshold, the current working state of the signal action mechanism is the normal working state; otherwise, it is the abnormal working state.

16. The gas density relay according to claim 1, characterized in that: The driving component includes one of magnetic force, gravity, motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure generating pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic component, magnetic coupling thrust mechanism, heating generating thrust mechanism, and chemical reaction generating thrust mechanism.

17. The gas density relay according to claim 1, wherein: The force transmitting member includes one of a cam, a connecting rod, a spring, a metal member, a non-metal member, a telescopic member, and a non-telescopic member.

18. The gas density relay according to claim 1, wherein: When the gas density relay body is of the first structure, a return spring is sleeved on the push rod between the fixing frame and the air hole.

19. The gas density relay according to claim 18, characterized in that: The force transmitting member is a cam. The end face of the cam opposite to the convex portion of the cam contacts the end of the push rod facing the force transmitting member, and the return spring is in a natural extension state; the driving component drives the cam to rotate, the convex portion of the cam strikes the push rod, driving the push rod to move in its axial direction, and when the convex portion of the cam leaves the push rod, the push rod is reset under the elastic force of the return spring.

20. The gas density relay according to claim 1, characterized in that: When the gas density relay body is of the second structure, the outer diameter of the first bellows is larger than the outer diameter of the second bellows.

21. The gas density relay according to claim 1, characterized in that: When the gas density relay body is of the second structure, the signal action mechanism includes a moving rod. One end of the moving rod extends into the second bellows, is connected to the first sealing member, and generates displacement along with the deformation of the first bellows; the other end of the moving rod extends out of the second bellows and is fixedly connected to an adjusting fixing member, and an adjusting screw is provided on the adjusting fixing member, and the adjusting screw is used to touch the signal generator under the driving force of the moving rod.

22. The gas density relay according to claim 1, characterized in that: When the gas density relay body is of the second structure, a return spring is sleeved on the push rod between the fixing member and the fixing frame.

23. The gas density relay according to claim 1, wherein: The intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches, and the displacement D collected by the diagnostic sensor, calculates or converts the displacement D into the corresponding pressure value P2, and calculates the equivalent gas pressure value P based on the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P and the pressure value corresponding to 20 °C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or, The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches 20 , and the displacement D collected by the diagnostic sensor, combines with the temperature value T collected by the temperature sensor, and calculates or converts it into the corresponding gas density value P2 20 , and based on the gas density value P1 20 and the gas density value P2 20 calculate the gas density value P 20 , and complete the online calibration of the gas density relay.

24. The gas density relay according to claim 23, wherein: When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed; or, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2*K, where K is a preset coefficient; according to this equivalent gas pressure value P, and converted into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed.

25. The gas density relay according to claim 23, characterized in that: When the contact signal of the gas density relay body acts or switches, the gas density value P 20 and the gas density values P1 20 , P2 20 The corresponding relationship between them is preset as a data table, and according to the gas density value P1 20 and the gas density value P2 20 Query the data table to obtain the corresponding gas density value P 20 , to complete the on-line calibration of the gas density relay; or, when the contact signal of the gas density relay body acts or switches, its gas density value P 20 The corresponding relationship between the gas pressure values P1, P2 and the temperature value T is preset as a data table, and according to the gas pressure values P1, P2 and the temperature value T, query the data table to obtain the corresponding gas density value P 20 , to complete the on-line calibration of the gas density relay.

26. The gas density relay according to claim 1, wherein: It further includes a force measuring sensor, which is arranged on the driving contact action mechanism or in the housing and is connected to the intelligent control unit, and is configured to detect the magnitude of the force exerted by the driving contact action mechanism on the gas density relay body.

27. The gas density relay according to claim 26, wherein: The force measuring sensor includes one of a gravity sensor, a pressure sensor, a magnetic force sensor, a displacement sensor, a deformation amount sensor, an optical sensor, an angle sensor, and a camera.

28. The gas density relay according to claim 26, wherein: The force measuring sensor is arranged on the push rod of the driving contact action mechanism; or, The force measuring sensor is arranged on the pressure detection element; or, The force measuring sensor is arranged on the temperature compensation element; or, The force measuring sensor is arranged on the signal action mechanism.

29. The gas density relay according to claim 26, wherein: The intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches, and the signal value F collected by the force sensor is converted into the corresponding equivalent pressure value P3 through calculation, and the equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P3; according to the equivalent gas pressure value P, and the pressure value corresponding to 20°C is converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or, The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches 20 , and the signal value F collected by the force sensor and the temperature value collected by the temperature sensor are converted into the corresponding equivalent gas density value P3 through calculation 20 , and based on the gas density value P1 20 and the gas density value P3 20 calculate the gas density value P 20 , completing the on-line calibration of the gas density relay.

30. The gas density relay according to claim 29, wherein: When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3; according to this equivalent gas pressure value P, and converting it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed; or, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P3*M, where M is a preset coefficient; according to this equivalent gas pressure value P, temperature value T, and converting it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the online calibration of the gas density relay is completed.

31. The gas density relay according to claim 29, wherein: When the contact signal of the gas density relay body acts or switches, the gas density value P 20 and the gas density value P1 20 , P3 20 The corresponding relationship between them is pre-designed as a data table, and according to the gas density value P1 20 and the gas density value P3 20 Query the data table to obtain the corresponding gas density value P 20 , complete the online calibration of the gas density relay; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships between the gas density value P, the gas pressure values P1 and P3, and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1 and P3 and the temperature value T 20 , to complete the on-line calibration of the gas density relay body; or When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationship between the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T is pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationship between the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T is pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay.

32. The gas density relay according to claim 1, wherein: The gas density relay or gas density monitoring device further includes an on-line calibration contact signal sampling unit, which is respectively connected to the signal generator and the intelligent control unit of the gas density relay body, and is configured to sample the contact signal of the gas density relay body.

33. The gas density relay according to claim 32, wherein: The on-line calibration contact signal sampling unit includes an isolation sampling element, which is controlled by the gas density relay body or the intelligent control unit; in the non-calibration state, the on-line calibration contact signal sampling unit is electrically isolated from the contact signal of the gas density relay body through the isolation sampling element; in the calibration state, the on-line calibration contact signal sampling unit cuts off the contact signal control loop of the gas density relay body through the isolation sampling element and connects the contact of the gas density relay body to the intelligent control unit; wherein, the isolation sampling element includes one of a travel switch, a microswitch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optocoupler, and a thyristor.

34. The gas density relay according to claim 32, wherein: It further includes a multi-way joint, and one or more of the gas density relay body, the gas density detection sensor, the on-line calibration contact signal sampling unit, and the intelligent control unit are arranged on the multi-way joint.

35. The gas density relay according to claim 1, wherein: The control of the intelligent control unit is through on-site control and / or through background control.

36. The gas density relay according to claim 1, wherein: A display mechanism for displaying the density of the insulating gas is further provided on the housing of the gas density relay body; the display mechanism includes a connecting rod, a movement, a pointer, and a dial, the movement is connected to the signal action mechanism or the temperature compensation element through the connecting rod, the pointer is installed on the movement and is arranged in front of the dial, and the pointer combines with the dial to display the gas density value; alternatively, the display mechanism includes a liquid crystal or / and a digital tube.

37. The gas density relay according to claim 36, wherein: The diagnostic sensor is arranged on the movement, or the pointer, or the connecting rod.

38. The gas density relay according to claim 1, characterized in that: At least two of the gas density relays or gas density monitoring devices are all connected to the remote background detection system through a hub and a protocol converter in sequence; wherein, the gas density relay or gas density monitoring device is arranged on the electrical equipment of its corresponding gas chamber.

39. The gas density relay according to claim 38, characterized in that: The hub adopts an RS485 hub; the protocol converter adopts an IEC61850 or IEC104 protocol converter.

40. A self-diagnosing gas density monitoring device, characterized in that, The gas density monitoring device includes a self-diagnosing gas density relay according to any one of claims 1-39.

41. A method for using a self-diagnosing gas density relay as described in claim 1, characterized in that, Including: In the normal working state, the gas density relay monitors the gas density value in the electrical equipment through the gas density detection sensor; The diagnostic sensor collects the pressure change, or temperature change, or the deformation amount of the component that deforms when the gas density changes, and / or the position or displacement amount of the component that generates displacement in the gas density relay body, and sends the collected data to the intelligent control unit; The intelligent control unit receives the data collected by the gas density detection sensor and / or the diagnostic sensor, and diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value; alternatively, the intelligent control unit uploads the received data to the background, and the background diagnoses whether the current working state of the gas density relay body is normal by determining whether the deformation amount, and / or position, and / or displacement amount is within a preset threshold, or by comparing the deformation amount, and / or position, and / or displacement amount with its corresponding preset standard value.

42. The method for using a self-diagnosing gas density relay according to claim 41, characterized in that: The gas density relay further includes a driving contact operating mechanism, which is arranged inside or outside the housing of the gas density relay body and is connected to the intelligent control unit. The driving contact operating mechanism is configured to apply a force to the gas density relay body, directly or indirectly causing the signal operating mechanism to displace, and / or driving the gas density relay body to generate a contact signal action; the usage method further includes: Controlling the driving contact operating mechanism through the intelligent control unit to cause the gas density relay body to generate a contact action. The intelligent control unit can detect that the gas density relay body generates a contact action, thereby completing the online simulation or virtual calibration of the gas density relay body.

43. The method for using a self-diagnosing gas density relay according to claim 42, characterized in that: The intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches, and the displacement D collected by the diagnostic sensor, calculates or converts the displacement D into the corresponding pressure value P2, and calculates the equivalent gas pressure value P based on the pressure value P1 and the pressure value P2; according to the equivalent gas pressure value P, and converts it into the pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or, The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches 20 , and the displacement D collected by the diagnostic sensor, combines with the temperature value T collected by the temperature sensor, and calculates or converts it into the corresponding gas density value P2 20 , and based on the gas density value P1 20 and the gas density value P2 20 calculates the gas density value P 20 , and completes the on-line calibration of the gas density relay.

44. The method for using a self-diagnosing gas density relay according to claim 43, characterized in that: When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2; according to this equivalent gas pressure value P, and the pressure value corresponding to 20°C, that is, the gas density value P, is converted according to the gas pressure-temperature characteristic, to complete the on-line calibration of the gas density relay; or, 20 , complete the on-line calibration of the gas density relay; or, When the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2 * K, where K is a preset coefficient; according to this equivalent gas pressure value P, and the pressure value corresponding to 20°C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , complete the on-line calibration of the gas density relay; or When the contact signal of the gas density relay body acts or switches, the gas density value P 20 and the gas density values P1 20 、P2 20 The corresponding relationship between them is preset as a data table, and according to the gas density value P1 20 and the gas density value P2 20 Query the data table to obtain the corresponding gas density value P 20 , complete the on-line calibration of the gas density relay; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 and the corresponding relationships between the gas pressure values P1, P2 and the temperature value T are preset as a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1, P2 and the temperature value T 20 , to complete the on-line calibration of the gas density relay.

45. The method for using a self-diagnosing gas density relay according to claim 42, characterized in that: The gas density relay further includes a force measuring sensor, which is arranged on the driving contact operating mechanism or inside the housing and is connected to the intelligent control unit, and is configured to detect the magnitude of the force applied by the driving contact operating mechanism to the gas density relay body; the usage method further includes: The intelligent control unit obtains the pressure value P1 and temperature value T collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches, and the signal value F collected by the force sensor is converted into the corresponding equivalent pressure value P3 through calculation, and the equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P3; according to the equivalent gas pressure value P, and the pressure value corresponding to 20 °C is converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , to complete the on-line calibration of the gas density relay; or, The intelligent control unit obtains the gas density value P1 collected by the gas density detection sensor when the contact signal of the gas density relay body acts or switches 20 , and the signal value F collected by the force sensor and the temperature value collected by the temperature sensor are converted into the corresponding equivalent gas density value P3 through calculation 20 , and based on the gas density value P1 20 and the gas density value P3 20 , the gas density value P is calculated 20 , completing the on-line calibration of the gas density relay.

46. The usage method of the self-diagnosing gas density relay according to claim 45, wherein: When the contact signal of the gas density relay body operates or switches, its equivalent gas pressure value P = P1 - P3; according to this equivalent gas pressure value P, and the pressure value corresponding to 20°C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the on-line calibration of the gas density relay is completed; or, When the contact signal of the gas density relay body operates or switches, its equivalent gas pressure value P = P1 - P3 * M, where M is a preset coefficient; according to the equivalent gas pressure value P, temperature value T, and the pressure value corresponding to 20 °C converted according to the gas pressure-temperature characteristic, that is, the gas density value P 20 , the on-line calibration of the gas density relay is completed; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 and the gas density values P1 20 , P3 20 The corresponding relationship between them is pre-designed as a data table, and according to the gas density value P1 20 and the gas density value P3 20 Query the data table to obtain the corresponding gas density value P 20 , to complete the online calibration of the gas density relay; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships between the gas density value P, the gas pressure values P1 and P3, and the temperature value T are pre-designed as a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure values P1 and P3 and the temperature value T 20 , to complete the on-line calibration of the gas density relay body; or, When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationship between the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T is pre-designed as a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the signal value F collected by the force sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay; or When the contact signal of the gas density relay body acts or switches, the gas density value P 20 The corresponding relationships among the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T are pre-designed into a data table, and the corresponding gas density value P is obtained by querying the data table according to the gas pressure value P1, the displacement D collected by the diagnostic sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay.

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