A gas density relay with an online self-checking function and its checking method

Abstract

The present application provides a gas density relay with an online self-checking function and a checking method thereof, which are used for high-voltage and medium-voltage electrical equipment. The gas density relay includes a gas density relay body, a first pressure sensor, a temperature sensor, a force sensor, a driving contact operating mechanism, and an intelligent control unit. The driving contact operating mechanism is configured to directly or indirectly drive the signal operating mechanism of the gas density relay body to displace, so that the gas density relay body generates a contact signal action. The intelligent control unit detects the alarm and / or locking contact signal action value and / or return value of the gas density relay body according to the density value at the time of contact action, and can complete the checking work of the gas density relay without the maintenance personnel going to the site, improving the reliability of the power grid, improving the efficiency, reducing the operation and maintenance cost, and realizing the maintenance-free of the gas density relay.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and particularly relates to a gas density relay with an on-line self-checking function and a checking method thereof, which are applied to high-voltage and medium-voltage electrical equipment. Background Art

[0002] With the development of unattended substations towards networking and digitization and the continuous strengthening of the requirements for remote control and remote measurement, on-line monitoring of the gas density and micro water content status of electrical equipment such as SF6 has important practical significance. With the continuous vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important part and key node of smart substations, plays a crucial role in the safety of the smart grid. Most current high-voltage electrical equipment is SF6 gas-insulated equipment. If the gas density decreases (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, on-line monitoring of the gas density value in SF6 high-voltage electrical equipment has been very common, and for this reason, the application of gas density monitoring systems (gas density relays) will flourish. Currently, the gas density monitoring systems (gas density relays) are basically as follows: 1) Using a remote transmission type SF6 gas density relay to collect, upload density, pressure and temperature, and realize on-line monitoring of gas density. 2) Using 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.

[0003] 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. Therefore, at present, the calibration of gas density relays has been highly regarded and popularized in the power system, and has been implemented by each power supply company, power plant, and large factory and mining enterprise. And power supply companies, power plants, and large factory and mining enterprises need to allocate testing personnel, equipment vehicles, and high-value SF6 gas to complete the on-site calibration and detection work of gas density relays. Roughly calculated, including the power outage business loss during detection, the annual detection cost allocated to each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the on-site calibration of the testing personnel is not carried out in a standardized manner, there are also potential safety hazards. Therefore, it is very necessary to innovate in the existing gas density self-checking gas density relays, especially in the gas density on-line self-checking gas density relays or systems, so that the gas density relay that realizes on-line gas density monitoring or the composed monitoring system also has the calibration function of the gas density relay, and then complete the regular calibration work of the (mechanical) gas density relay without the need for maintenance personnel to go to the site, so as to improve work efficiency and reduce operation and maintenance costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas density relay with an on-line self-checking function and its checking method to solve the problems raised in the above technical background.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The first aspect of the present application provides a gas density relay with an on-line self-checking function, including: a gas density relay body, a first pressure sensor, a temperature sensor, a force sensor, a driving contact action mechanism, and an intelligent control unit;

[0007] 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;

[0008] The first pressure sensor is connected to the pressure detection element of the gas density relay body;

[0009] The driving contact operating mechanism is disposed inside or outside the housing, and includes a force applying mechanism and a motion mechanism. The force applying mechanism includes a driving component and a force transmitting member driven by the driving component. The motion mechanism includes a push rod. The push rod moves under the drive of the force applying mechanism, directly or indirectly causing the signal operating mechanism to displace, so as to trigger the signal generator to generate a contact signal operation;

[0010] The force measuring sensor is disposed on the driving contact operating mechanism or inside the housing, and is configured to detect the magnitude of the force applied by the driving contact operating mechanism to the gas density relay body;

[0011] The intelligent control unit is respectively connected to the driving contact operating mechanism, the first pressure sensor, the temperature sensor, and the force measuring sensor, and is configured to complete the control of the driving contact operating mechanism, collect the pressure value, the temperature value, and / or the gas density value, and / or detect the contact signal operation value and / or the contact signal return value of the gas density relay body;

[0012] Wherein, the contact signal includes alarm and / or locking.

[0013] The second aspect of the present application provides a gas density monitoring device with an online self-checking function, including: a gas density relay body, a first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact operating mechanism, 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 operating mechanism disposed inside the housing;

[0015] The first pressure sensor is communicated with the pressure detection element of the gas density relay body;

[0016] The driving contact operating mechanism is disposed inside or outside the housing, and includes a force applying mechanism and a motion mechanism. The force applying mechanism includes a driving component and a force transmitting member driven by the driving component. The motion mechanism includes a push rod. The push rod moves under the drive of the force applying mechanism, directly or indirectly causing the signal operating mechanism to displace, so as to trigger the signal generator to generate a contact signal operation;

[0017] The force measuring sensor is disposed on the driving contact operating mechanism or inside the housing, and is configured to detect the magnitude of the force applied by the driving contact operating mechanism to the gas density relay body;

[0018] The intelligent control unit is respectively connected to the driving contact actuating mechanism, the first pressure sensor, the temperature sensor, and the force measuring sensor, and is configured to complete the control of the driving contact actuating mechanism, the acquisition of the pressure value and the temperature value, and / or the acquisition of the gas density value, or / and detect the contact signal action value and / or the contact signal return value of the gas density relay body;

[0019] Among them, the contact signal includes alarm and / or locking.

[0020] Preferably, the signal generator includes a microswitch or a magnetic-assisted electric contact, and the gas density relay body outputs a contact signal through the signal generator.

[0021] Preferably, the temperature compensation element uses a temperature compensation sheet or the gas enclosed in the housing.

[0022] Preferably, the pressure detection element includes a Bourdon tube or a bellows.

[0023] Preferably, the force measuring sensor includes one of a gravity sensor, a pressure sensor, a magnetic force sensor, a displacement sensor, a deformation amount sensor, a photoelectric sensor, an angle sensor, and a camera.

[0024] 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, and chemical reaction generating thrust mechanism.

[0025] Preferably, the force transmitting member includes one of a cam, a connecting rod, a spring, a metal part, a non-metal part, a telescopic part, and a non-telescopic part.

[0026] Preferably, the force measuring sensor is arranged on the push rod of the driving contact actuating mechanism; or,

[0027] The force measuring sensor is arranged on the pressure detection element; or,

[0028] The force measuring sensor is arranged on the temperature compensation element; or,

[0029] The force measuring sensor is arranged on the signal actuating mechanism.

[0030] Preferably, the gas density relay body further includes a base, an end seat, and a movement mechanism disposed within the housing; the movement mechanism is fixed to the base; the pressure detection element is a Bourdon tube filled with a sealed gas, one end of which is fixed to and communicates 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 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 contact driving mechanism is disposed outside the housing of the gas density relay body, and the contact driving 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 component, and the push rod are disposed within the outer cover; alternatively, the contact driving mechanism is disposed within the housing of the gas density relay body.

[0031] More preferably, a fixing member is provided at one end of the push rod facing the force applying mechanism, the fixing member is fixed within the outer cover, the other end of the push rod passes through and is fixed to a fixing frame at the opening of the outer cover, and the end of the push rod passing through the fixing frame extends into the housing through a pore on the housing of the gas density relay body; an end seat contact plate is provided on the end seat within the housing, and the end of the push rod extending into the housing is disposed opposite to the end seat contact plate.

[0032] Further, the force measuring sensor is connected to the push rod through a contact member, or the force measuring sensor is directly connected to the push rod.

[0033] Further, a return spring is sleeved on the push rod between the fixing member and the fixing frame.

[0034] Even further, the force transmission component is a cam, the end face of the cam opposite to the convex portion of the cam contacts one end of the push rod facing the cam, and the return spring is in a natural extended state; the driving component drives the cam to rotate, the convex portion of the cam strikes the push rod to drive 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.

[0035] More preferably, one end of the push rod facing the force applying mechanism passes through a fixing frame, the fixing frame is fixedly provided 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 within the housing.

[0036] Further, the force measuring sensor is in contact with the pressure detecting element through a contact member, or the force measuring sensor is directly in contact with the pressure detecting element.

[0037] Further, a return spring is sleeved on the push rod between the fixing bracket and the air hole.

[0038] Furthermore, the force transmitting member is a cam. The end face of the cam opposite to the convex portion of the cam is in contact with one end of the push rod facing the cam, and the return spring is in a natural stretched state. The driving component drives the cam to rotate. The convex portion of the cam strikes the push rod to drive the push rod to move in its axial direction. When the convex portion of the cam leaves the push rod, the push rod is reset under the elastic force of the return spring.

[0039] More preferably, the movement includes a sector gear and a central gear. The first end of the sector gear is engaged 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. One end of a sector gear contact member is fixedly connected to the second end of the sector gear. The other end of the sector gear contact member extends out of the housing of the gas density relay body through the air hole of the housing and is disposed opposite to one end of the push rod of the driving contact operating mechanism away from the force applying mechanism.

[0040] Further, the force applying mechanism applies a force to the sector gear contact member through the push rod, causing a displacement of the second end of the sector gear. The first end of the sector gear engaged with the central gear drives the central gear to rotate. The central gear and the pointer are both mounted on the driving rod. The rotation of the central gear drives the driving rod to rotate, causing the pointer to move and indicate on the scale.

[0041] Furthermore, a trigger is provided on the pointer, and the trigger is used to connect or disconnect the contact of the signal generator.

[0042] Further, the force measuring sensor is disposed on the force applying mechanism of the driving contact operating mechanism.

[0043] Preferably, 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 define 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 define 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 define a third gas chamber, and the signal generator and the signal action mechanism are disposed in the third gas chamber. The signal action mechanism is connected to the first seal, and the signal generator is disposed corresponding to the signal action mechanism. The driving contact action 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 transmitting member. The end of the push rod far from the force transmitting member penetrates through a fixing bracket fixed to the inner wall of the housing and extends below the fixing bracket to be disposed opposite to the signal action mechanism.

[0044] More preferably, the outer diameter of the first bellows is larger than the outer diameter of the second bellows.

[0045] More preferably, 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. The adjusting fixing member is provided with an adjusting screw, and the adjusting screw is used to touch the signal generator under the driving force of the moving rod.

[0046] More preferably, a return spring is sleeved on the push rod between the fixing member and the fixing bracket.

[0047] More preferably, the force measuring sensor is connected to the push rod through a contact member, or the force measuring sensor is directly connected to the push rod.

[0048] Further, the force measuring sensor is disposed at one end of the push rod facing the force transmitting member, or the force measuring sensor is disposed at one end of the push rod facing away from the force transmitting member.

[0049] Preferably, the intelligent control unit obtains the gas density values collected by the first pressure sensor and the temperature sensor; alternatively, the intelligent control unit obtains the pressure value collected by the first pressure sensor and the temperature value collected by the temperature sensor, for online monitoring of the gas density of electrical equipment by the gas density relay.

[0050] Preferably, when the contact signal of the gas density relay body acts or switches, the intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, 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 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 online calibration of the gas density relay; or,

[0051] The intelligent control unit obtains the gas density value P1 collected by the first pressure sensor and the temperature sensor when the contact signal of the gas density relay body acts or switches 20 , and the force F collected by the force sensor, combines 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 , to complete the online calibration of the gas density relay; or,

[0052] The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, and calculates the corresponding gas density value P based on the pressure value P1, T and F 20 , to complete the online calibration of the gas density relay.

[0053] More preferably, when the contact signal of the gas density relay body acts or switches, its equivalent gas pressure value P = P1 - P2; 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 online 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 the equivalent gas pressure value P, the 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 P20 , complete the on-line calibration of the gas density relay.

[0054] More preferably, 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 pre-designed into a data table, and the corresponding gas density value P is obtained by querying 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

[0055] 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 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 to complete the on-line calibration of the gas density relay body; or,

[0056] 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 value P1, the force 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, F and the temperature value T 20 , complete the on-line calibration of the gas density relay body.

[0057] Preferably, the gas density relay or the gas density monitoring device further includes an on-line calibration contact signal sampling unit, and the on-line calibration contact signal sampling unit 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.

[0058] ​More preferably, the on-line verification contact signal sampling unit includes an isolation sampling element, which is controlled by the gas density relay body, or the driving contact action mechanism, or the intelligent control unit; in the non-verification state, the on-line verification contact signal sampling unit is electrically isolated from the contact signal of the gas density relay body through the isolation sampling element; in the verification state, the on-line verification 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.

[0059] Furthermore, the on-line verification contact signal sampling unit includes a first connection circuit and a second connection circuit. The first connection circuit connects the contact of the gas density relay body to the contact signal control loop, and the second connection circuit connects the contact of the gas density relay body to the intelligent control unit; in the non-verification state, the second connection circuit is disconnected and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit cuts off the first connection circuit and connects the second connection circuit to connect the contact of the gas density relay body to the intelligent control unit.

[0060] 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 first pressure sensor, the driving contact action mechanism, the on-line verification contact signal sampling unit, the intelligent control unit, and the temperature sensor are arranged on the multi-way joint.

[0061] Preferably, the control of the intelligent control unit is through on-site control and / or through background control.

[0062] Preferably, a display mechanism for displaying the density of the insulating gas is further provided on the housing of the gas density relay body.

[0063] More preferably, the display mechanism includes a connection mechanism, a movement, a pointer, and a dial. The movement is connected to the signal action mechanism through the connection mechanism. 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; or, the display mechanism includes a liquid crystal or / and a digital tube.

[0064] The third aspect of the present application provides a method for verifying a gas density relay, including:

[0065] In the normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;

[0066] The gas density relay or gas density monitoring device, according to the set calibration time or / and calibration instruction, and the gas density value, under the condition that the gas density relay is allowed to be calibrated:

[0067] Drive the contact operating mechanism through the intelligent control unit, so that the moving mechanism of the contact operating mechanism applies a force to the components inside the gas density relay under the drive of the force applying mechanism, causing the signal operating mechanism of the gas density relay body to displace, triggering the signal generator to generate a contact signal operation; the intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force measuring sensor when the contact signal operation or switching occurs in the gas density relay body, calculates or converts the force F into the 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 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 , complete the on-line calibration of the gas density relay; or,

[0068] The intelligent control unit obtains the gas density value P1 collected by the first pressure sensor and the temperature sensor when the contact signal operation or switching occurs in the gas density relay body 20 , and the force F collected by the force measuring sensor, combines the temperature value T collected by the temperature sensor, and calculates or converts it into the corresponding gas density value P2 20 , and according to the gas density value P1 20 and the gas density value P2 20 calculate the gas density value P 20 , complete the on-line calibration of the gas density relay; or,

[0069] The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force measuring sensor when the contact signal operation or switching occurs in the gas density relay body, and calculates the corresponding gas density value P according to the pressure value P1, T and F 20 , complete the on-line calibration of the gas density relay;

[0070] When all the contact signal calibration work is completed, the intelligent control unit restores the contact operating mechanism.

[0071] Preferably, the gas density relay or the 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; the calibration method includes:

[0072] In the normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and at the same time, the gas density relay or the gas density monitoring device on-line monitors the gas density value in the electrical equipment through the first pressure sensor, the temperature sensor and the intelligent control unit;

[0073] According to the set calibration time or / and calibration instruction, and the gas density value situation, when the situation allows the gas density relay to be calibrated:

[0074] The on-line calibration contact signal sampling unit is adjusted to the calibration state through the intelligent control unit. In the calibration state, the on-line calibration contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit;

[0075] The intelligent control unit drives the contact operating mechanism, so that the moving mechanism of the contact operating mechanism applies a force to the components in the gas density relay body under the drive of the force applying mechanism, causing the signal operating mechanism of the gas density relay body to displace, triggering the signal generator to generate a contact signal action. The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force measuring sensor when the gas density relay body has a contact signal action or switching. The force F is calculated or converted into a corresponding pressure value P2, and the equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P2; 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 , completing the on-line calibration of the gas density relay; or,

[0076] The intelligent control unit obtains the gas density value P1 collected by the first pressure sensor and the temperature sensor when the gas density relay body has a contact signal action or switching 20 , and the force F collected by the force measuring sensor, combines the temperature value T collected by the temperature sensor, and is calculated or converted into a corresponding gas density value P2 20 , and according to the gas density value P1 20 and the gas density value P2 20 calculate the gas density value P 20, complete the on-line calibration of the gas density relay; or,

[0077] When the intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, and calculates the corresponding gas density value P according to the pressure value P1, T, and F 20 , complete the on-line calibration of the gas density relay;

[0078] When all the contact signal calibration work is completed, the intelligent control unit restores the driving contact action mechanism, adjusts the on-line calibration contact signal sampling unit to the working state, and the control loop of the contact signal of the gas density relay body resumes normal operation.

[0079] Preferably, a calibration method for a gas density relay includes:

[0080] 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 corresponding pressure value at 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,

[0081] 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, temperature value T, and converted into the corresponding pressure value at 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,

[0082] 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 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 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,

[0083] 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, P2 and the temperature value T is pre-designed into a data table, and the corresponding gas density value P is queried according to the gas pressure values P1, P2 and the temperature value T20 , complete the on-line calibration of the gas density relay body; or,

[0084] When the gas density relay body has a contact signal action or switching, its gas density value P 20 The corresponding relationships between the gas pressure value P1, the force 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 force F collected by the force sensor, and the temperature value T 20 , complete the on-line calibration of the gas density relay body.

[0085] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0086] The present application provides a gas density relay with an on-line self-calibration function and its calibration method, which are used for high-voltage and medium-voltage electrical equipment, including a gas density relay body, a first pressure sensor, a temperature sensor, a force sensor, a driving contact action mechanism, and an intelligent control unit. The driving contact action mechanism is configured to directly or indirectly drive the signal action mechanism of the gas density relay body to displace, so that the gas density relay body has a contact signal action. The intelligent control unit detects the alarm and / or locking contact signal action value and / or return value of the gas density relay body according to the density value during the contact action, and the calibration work of the gas density relay can be completed without the maintenance personnel going to the site, improving the reliability of the power grid, improving the efficiency, reducing the cost, and realizing the maintenance-free of the gas density relay. At the same time, the entire calibration process realizes zero emission of SF6 gas, meeting the requirements of environmental protection regulations. Most importantly, due to the technical innovation of the present invention: the driving contact action mechanism is not connected to the main gas path of SF6 of the gas density relay body or the electrical equipment, which can greatly improve the reliability of the power grid, reduce its sealing requirements, and can reduce the manufacturing cost and improve the convenience and flexibility of on-site installation. The present application realizes the on-line calibration of the gas density relay, and further realizes the intelligent management of the entire life cycle of the gas density relay: repair only when there is a problem, and no operation and maintenance services are required when there is no problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments and descriptions thereof of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0088] Figure 1 is a schematic structural diagram of a gas density relay with an on-line self-calibration function in Embodiment 1;

[0089] Figure 2It is a schematic structural diagram of the gas density relay with an online self-checking function in the second embodiment;

[0090] Figure 3 It is a schematic structural diagram of the gas density relay with an online self-checking function in the third embodiment;

[0091] Figure 4 It is a schematic structural diagram of the gas density relay with an online self-checking function in the fourth embodiment. Specific implementation manners

[0092] 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.

[0093] Embodiment 1:

[0094] Figure 1 It is a schematic structural diagram of the gas density relay of Embodiment 1 of this application. As Figure 1 shown, a gas density relay includes: a gas density relay body 1, a first pressure sensor 2, a temperature sensor 3, a force sensor 16, a driving contact action mechanism 15, an online calibration contact signal sampling unit 6, and an intelligent control unit 7.

[0095] Among them, 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, a plurality of signal generators 109, a movement 105, a pointer 106, a connecting rod 112, and a dial 107 provided in the housing 101. The movement 105 is fixed on the base 102; one end of the pressure detection element 103 (Bourdon tube) is fixed on the base 102 and communicated with it. The pressure detection element 103 (Bourdon tube) is filled with a sealed gas. The other end of the pressure detection element 103 (Bourdon tube) is connected to one end of the temperature compensation element 104 through the end seat 108. The temperature compensation element 104 adopts a temperature compensation sheet. A signal action mechanism 111 is provided at the other end of the temperature compensation element 104; an adjusting member (such as an adjusting screw) for pushing the signal generator 109 and making the contacts of the signal generator 109 connect or disconnect is provided on the signal action mechanism 111. The signal generator 109 includes a microswitch or a magnetic-assisted electric contact. The gas density relay body 1 outputs contact signals through the signal generator 109. An end seat contact plate 108A is provided on the end seat 108. 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 provided in front of the dial 107. The pointer 106 combines with the dial 107 to display the gas density value. The gas density relay body 1 may further include a digital device or a liquid crystal device with indication display.

[0096] The gas density relay body 1 of this embodiment may include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch, or a gas pressure gauge. The first pressure sensor 2, the temperature sensor 3, the on-line calibration contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the joint 110. The force measurement sensor 16 and the driving contact action mechanism 15 are arranged outside the housing 101. The first pressure sensor 2, the temperature sensor 3, the on-line calibration contact signal sampling unit 6, the force measurement sensor 16, and the intelligent control unit 7 are connected; the on-line calibration contact signal sampling unit 6 is connected to the signal generator 109.

[0097] The driving contact operating mechanism 15 is arranged outside the housing 101 and is correspondingly arranged opposite to the end seat contact plate 108A on the end seat 108 of the gas density relay body 1; the driving contact operating mechanism 15 is configured to indirectly cause a corresponding displacement of the signal operating mechanism 111 of the gas density relay body 1, thereby causing the contact signal operation of the gas density relay body 1. Specifically, the contact operating mechanism 15 includes an outer cover 158 with an opening, and a driving component 151, a force transmission member 152, and a push rod 153 arranged inside the outer cover 158. The push rod 153 is correspondingly arranged opposite to the end seat contact plate 108A, and the opening of the outer cover 158 faces the housing 101 of the gas density relay body 1. The force transmission member 152 rotates under the drive of the driving component 151; one end of the push rod 153 close to the force transmission member 152 is provided with a fixing member 156, and the fixing member 156 is fixedly arranged on the inner wall of the outer cover 158. The end of the push rod 153 far from the force transmission member 152 penetrates through a fixing bracket 155 fixed at the opening of the outer cover 158. The fixing bracket 155 is provided with a through guiding hole for the push rod 153 to pass through and be installed. The inner diameter of the guiding hole is larger than the outer diameter of the push rod 153. After the end of the push rod 153 far from the force transmission member 152 passes through the guiding hole on the fixing bracket 155, it extends into the housing 101 through a gas hole on the housing 101 of the gas density relay body 1, and the end of the push rod 153 extending into the housing 101 is arranged opposite to the end seat contact plate 108A inside the housing 101.

[0098] In this embodiment, the driving component 151 is a motor, and the force transmission member 152 is a cam, and the cam rotates under the drive of the motor. There are many specific ways for the motor to drive the cam to rotate. For example, a rotating shaft is connected between two support plates through bearings, the cam is arranged between the two support plates through the rotating shaft, and the output shaft of the motor is fixedly connected to one end of the rotating shaft. When the motor rotates, it drives the rotating shaft to rotate, thereby driving the cam fixedly installed on the rotating shaft to rotate. Another example is that a rotatable rotating shaft is erected above the push rod, the cam and a large gear are coaxially fixedly installed on the rotating shaft, a small gear is fixedly installed on the output shaft of the motor, the small gear is meshed with the large gear, when the motor rotates, it drives the small gear to rotate, the large gear rotates accordingly, driving the rotating shaft for installing the large gear to rotate, thereby driving the cam fixedly installed on the rotating shaft to rotate.

[0099] A return spring 154 is sleeved on a push rod 153 between a fixing member 156 and a fixing bracket 155. When the push rod 153 is in an unloaded state, the end face of the cam opposite to the convex portion of the cam contacts one end of the push rod 153 provided with the fixing member 156, the return spring 154 is in a natural extension state, and the portion of the push rod 153 extending out of the fixing bracket 155 is located on one side of the end seat contact plate 108A of the gas density relay body 1 and does not contact the end seat contact plate 108A. When the motor drives the cam to rotate and the convex portion of the cam strikes the push rod 153 to drive the push rod 153 to move in its axial direction, when the convex portion of the cam leaves one end of the push rod 153 provided with the fixing member 156, the push rod 153 is reset under the elastic force of the return spring 154.

[0100] The contact operating mechanism 15 further includes a force measuring sensor 16, and the force measuring sensor 16 is connected to the push rod 153 through a contact member 1501. In this embodiment, the force measuring sensor 16 is a displacement sensor or a deformation amount sensor and is arranged at one end of the push rod 153 provided with the fixing member 156. The force measuring sensor 16 is connected to the intelligent control unit 7 and is used to detect the force F applied by the driving contact operating mechanism 15 to the end seat 108.

[0101] When the driving component 151 does not apply force, under the action of the return spring 154, the push rod 153 moves away from the end seat contact plate 108A and the push rod 153 does not apply force to the end seat contact plate 108A. The force measuring sensor 16 is connected to the push rod 153 through the contact member 1501. The push rod 153 is acted on by the force applying component 151 and the force transmitting member 152, and the force F applied to the return spring 154 by the push rod 153 can be detected by measuring the deformation amount of the return spring 154 by the force measuring sensor 16 (F = L * N, where: L is the deformation amount, mm; N is the elastic coefficient, kg / mm). During calibration, the force applying component 151 rotates the force transmitting member 152, then pushes the push rod 153 to move rightward, and further applies a force F to the return spring 154 and the end seat contact plate 108A (i.e., the end seat 108), that is, the force applying component 151 applies a force to the end seat 108 through the force transmitting member 152 to cause the contact signal action of the gas density relay body 1.

[0102] The above-mentioned 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, thrust mechanism generated by heating, thrust mechanism generated by electric heating, and thrust mechanism generated by chemical reaction; the force transmission member 152 includes, but is not limited to, one of cam, connecting rod, spring, metal part, non-metal part, telescopic part, and non-telescopic part; the force measuring sensor 16 includes, but is not limited to, one of gravity sensor, pressure sensor, magnetic force sensor, displacement sensor, deformation amount sensor, photoelectric sensor, angle sensor, strain gauge sensor, force sensor, and camera, and the displacement sensor includes, but is not limited to, one of laser displacement sensor, infrared displacement sensor, contact displacement sensor, and non-contact displacement sensor.

[0103] Its working principle is as follows:

[0104] The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the first pressure sensor 2 and the temperature sensor 3, and obtains the corresponding pressure value P at 20 °C 20 (i.e., the gas density value). When it is necessary to calibrate the gas density relay body 1, if the gas density value P 20 ≥ the set safety calibration density value P S ; the intelligent control unit 7 disconnects the control circuit of the gas density relay body 1, so that when calibrating the gas density relay body 1 online, it will not affect the safe operation of the electrical equipment, nor will it misemit alarm signals or block the control circuit during calibration. Because before starting the calibration of the gas density relay, the gas density value P 20 ≥ the set safety calibration density value P S has been monitored and judged, and the gas of the electrical equipment is within the safe operation range. Moreover, gas leakage is a slow process, and it is safe during calibration. At the same time, the intelligent control unit 7 connects the contact sampling circuit of the gas density relay body 1.

[0105] Through the drive of the intelligent control unit 7, the contact action mechanism 15 is driven, so that the end seat 108 of the gas density relay body 1 is displaced. With the help of the temperature compensation element 104, the signal action mechanism 111 is displaced. The adjusting part (for example, adjusting screw) on the signal action mechanism 111 pushes the signal generator 109 (for example, micro switch), and the contacts of the signal generator 109 are closed, sending out corresponding contact signals (alarm or block).

[0106] Next, the push rod 153 is reset under the elastic force of the reset spring 154, and no longer applies force to the end seat contact plate 108A, the temperature compensation element 104 is reset, the adjustment member is away from the signal generator 109, the contact of the signal generator 109 is disconnected, and the contact signal (alarm or lockout) is released.

[0107] The intelligent control unit 7 obtains the pressure value P1 collected by the first pressure sensor 2 and the temperature value T collected by the temperature sensor 3 when the contact signal of the gas density relay body 1 is actuated or switched, and the force F collected by the force sensor 16, 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 Alternatively, the intelligent control unit 7 obtains the gas density value P1 collected by the first pressure sensor 2 and the temperature sensor 3 when the contact signal of the gas density relay body 1 is actuated or switched. 20 , and the force F collected by the force sensor 16, combined with the temperature value T collected by the temperature sensor 3, 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. Further, when the gas density relay body 1 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 characteristics, it is converted into a pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online verification of the gas density relay; or, when the contact signal of the gas density relay body 1 is actuated or switched, its equivalent gas pressure value P = P1-P2*K; wherein K is a preset coefficient, obtained according to the characteristics of the gas density relay body; according to the equivalent gas pressure value P, temperature value T, and according to the gas pressure-temperature characteristics, the pressure value corresponding to 20°C, that is, the gas density value P 20 , complete the online verification of the gas density relay. Alternatively, when the gas density relay body 1 has 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 designed 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 P20 , 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 The corresponding relationship between the gas pressure values P1, P2 and the temperature value T is 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, P2 and the temperature value T 20 , complete the on-line calibration of the gas density relay. Calibrate multiple times repeatedly (for example, 2 to 3 times), and then calculate its average value, so that the calibration work of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. At the same time, the contact driving mechanism 15 is restored through the intelligent control unit 7. The control loop of the gas density relay body 1 is connected through the intelligent control unit 7, the density monitoring loop of the gas density relay body 1 works normally, and the gas density relay body 1 monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. In this way, it is convenient to complete the on-line calibration work of the gas density relay body 1, and at the same time, the on-line calibration of the gas density relay body 1 will not affect the safe operation of the electrical equipment.

[0108] After the gas density relay body 1 has completed the calibration work, the gas density relay makes a determination and can announce the detection result. The methods are flexible. Specifically, it can: 1) Announce locally, for example, through indicators, digital displays, or liquid crystal displays; 2) Or upload through online remote communication methods, for example, it can be uploaded to the background of the online monitoring system; 3) Or upload wirelessly to a specific terminal, for example, it can be wirelessly uploaded to a mobile phone; 4) Or upload through other channels; 5) Or upload the abnormal result through the alarm signal line or dedicated signal line; 6) Upload alone or bundled with other signals. In short, after completing the online calibration work of the gas density relay, if there is an abnormality, it can automatically issue an alarm, be uploaded to a remote location, or be sent to a designated receiver, such as a mobile phone. Or, after completing the calibration work of the gas density relay, if there is an abnormality, the intelligent control unit 7 can upload to a remote location (monitoring room, background monitoring platform, etc.) through the alarm contact signal of the gas density relay body 1, and can also display and announce locally. For the simple version of the online calibration of the gas density relay, the abnormal calibration result can be uploaded through the alarm signal line. It can be uploaded regularly. For example, when there is an abnormality, a contact is connected in parallel to the alarm signal contact and closes and disconnects regularly, and the situation can be obtained through analysis; or it can be uploaded through an independent calibration signal line. Specifically, it can upload when the status is good or when there is a problem, and can also be uploaded through remote density online monitoring, or upload the calibration result through a separate calibration signal line, or through local display and local alarm, or through wireless upload and connect to a smart phone for upload. Its communication method can be wired or wireless. The wired communication method can be industrial buses such as RS232, RS485, CAN-BUS, fiber optic Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; the wireless communication method can be 2G / 3G / 4G / 5G, etc., WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, acoustic wave, satellite, light wave, quantum communication, sonar, sensors with built-in 5G / NB-IOT communication modules (such as NB-IOT), etc. In short, it can be in multiple ways and multiple combinations to fully ensure the reliable performance of the gas density relay.

[0109] The gas density relay can be calibrated online according to the set time or according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). When calibrating online at high temperature, low temperature, normal temperature, and 20°C ambient temperature, the error judgment requirements are different. For example, when calibrating at 20°C ambient temperature, it can be based on the accuracy requirements of the gas density relay being 1.0 level or 1.6 level, and at high temperature, it can be 2.5 level. Specifically, it can be implemented according to the temperature requirements in accordance with relevant standards. For example, in accordance with the temperature compensation performance provisions in Article 4.8 of DL / T 259 "Calibration Specification for Sulfur Hexafluoride Gas Density Relay", the accuracy requirements corresponding to each temperature value.

[0110] The gas density relay can compare its error performance according to the density relay at different temperatures and different time periods. That is, the comparison within the same temperature range at different times to determine the performance of the gas density relay and electrical equipment. It has comparisons for each historical period and comparisons between history and the present.

[0111] The gas density relay can be calibrated repeatedly (such as 2 - 3 times), and its average value can be calculated based on the calibration results of each time. When necessary, the gas density relay can be calibrated online at any time.

[0112] The gas density relay has functions of pressure, temperature measurement, and software conversion. Without affecting the safe operation of electrical equipment, it can detect online the alarm and / or locking contact action value and / or return value of the gas density relay body 1. Of course, the return value of the alarm and / or locking contact signal can also not be tested according to requirements. At the same time, the gas density relay can also monitor online the gas density value, and / or pressure value, and / or temperature value of electrical equipment and upload them to the target device to achieve online monitoring.

[0113] The above-mentioned gas density relay body 1 includes: a gas density relay with bimetal compensation, a gas density relay with gas compensation, or a gas density relay with a combination of bimetal and gas compensation; a completely mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a density relay with indication (a density relay with pointer display, or digital display, or liquid crystal display), a density relay without indication (i.e., density switch); an SF6 gas density relay, an SF6 mixed gas density relay, an N2 gas density relay, other gas density relays, etc.

[0114] The types of the above-mentioned first pressure sensor 2: absolute pressure sensor, relative pressure sensor, or both absolute and relative pressure sensors, 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 induction 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, for example, diffused silicon type, sapphire type, piezoelectric type, strain gauge type (resistance strain gauge type, ceramic strain gauge type).

[0115] The above-mentioned 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.

[0116] The above-mentioned on-line calibration contact signal sampling unit 6 is used to complete the contact signal sampling of the gas density relay body 1. That is, the basic requirements or functions of the on-line calibration contact signal sampling unit 6 are: 1) It does not affect the safe operation of electrical equipment during calibration. That is, when the contact signal of the gas density relay body 1 operates during calibration, it will not affect the safe operation of electrical equipment; 2) The contact signal control circuit of the gas density relay body 1 does not affect the performance of the gas density relay, especially does not affect the performance of the intelligent control unit 7, and will not cause damage to the gas density relay or affect the test work.

[0117] The basic requirements or functions of the above-mentioned intelligent control unit 7 are: It can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 operates, and convert them into the corresponding pressure value P at 20°C 20 (density value), that is, it can detect the contact operation value P of the gas density relay body 1 D20 , and complete the calibration work of the gas density relay body 1. Or, it can directly detect the density value P when the contact signal of the gas density relay body 1 operates D20, the calibration work of the gas density relay body 1 is completed. Of course, the intelligent control unit 7 can also achieve: completing the storage of test data; and / or exporting test data; and / or making test data printable; and / or communicating with the upper computer for data; and / or inputting analog and digital information. The intelligent control unit 7 further includes a communication module, which 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 1 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 body 1. At the same time, through the test of the rated pressure value of the gas density relay body 1, the self-calibration work among the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 can be completed to achieve maintenance-free operation.

[0118] The above electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas-insulated switchgear, ring main units, and so on.

[0119] The gas density relay body 1, the first pressure sensor 2, the temperature sensor 3, the driving mechanism for actuating the contact 15, the on-line calibration contact signal sampling unit 6, and the intelligent control unit 7 can be flexibly set as needed. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 can be set together; in short, their settings can be flexibly arranged and combined.

[0120] 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 bracket extends into the housing through the air hole on the housing of the gas density relay body. The push rod and the inner wall of the housing can be in sealed contact 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 trigger part for pushing the signal generator to make the contact of the signal generator connect or disconnect. Specifically, the trigger part completes the connection or disconnection of the contact 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).

[0121] Embodiment 2:

[0122] As Figure 2 shown, a gas density relay or a gas density monitoring device with an online self-checking function provided by Embodiment 2 of the present invention.

[0123] The difference from Embodiment 1 is that:

[0124] 1) The driving contact action mechanism 15 is arranged outside the housing 101 and is correspondingly arranged opposite to the pressure detection element 103 (Bourdon tube) of the gas density relay body 1; the driving contact action mechanism 15 is configured to indirectly cause the signal action mechanism 111 of the gas density relay body 1 to generate a corresponding displacement, thereby causing the gas density relay body 1 to have a contact signal action.

[0125] 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 return spring 154, and a fixing bracket 155 arranged 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 arranged opposite to the pressure detection element 103 (Bourdon tube) inside the housing 101. The force measurement sensor 16 (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 arranged opposite to the pressure detection element 103 (Bourdon tube), and the force contact member 16A of the force measurement sensor 16 contacts the pressure detection element 103 (Bourdon tube). Through the force measurement sensor 16, the force F exerted by the push rod 153 on the pressure detection element 103 (Bourdon tube) can be detected.

[0126] 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 arranged 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. When the push rod 153 is in an unloaded state, the end face of the force transmission member 152 (cam) opposite to the convex part of the force transmission member 152 (cam) contacts one end of the push rod 153 passing through the fixing bracket 155, and the return spring 154 is in a natural extended state. The part 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 exert a force on the pressure detection element 103 (Bourdon tube).

[0127] 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.

[0128] The intelligent control unit 7 obtains the pressure value P1 collected by the first pressure sensor 2 and the temperature value T collected by the temperature sensor 3 when the contact signal of the gas density relay body 1 is actuated or switched, and the force F collected by the force sensor 16, 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.

[0129] 2) In this embodiment, the first pressure sensor 2, the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the joint 110. The temperature sensor 3 is arranged in the housing 101 and is arranged close to the temperature compensation element 104, or the temperature sensor 3 is directly arranged on the temperature compensation element 104. The first pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the force sensor 16 are respectively connected to the intelligent control unit 7; the online verification contact signal sampling unit 6 is also connected to the signal generator 109.

[0130] Embodiment three:

[0131] like Figure 3 As shown, a gas density relay or a gas density monitoring device with an online self-checking function is provided in the third embodiment of the present invention.

[0132] The difference from the first embodiment is that:

[0133] 1) The driving contact operating mechanism 15 is arranged outside the housing 101 of the gas density relay body 1, and includes an outer cover 158 with one end open, and a driving component 151, a force transmission component 152 (cam), and a push rod 153 arranged inside the outer cover 158. The outer cover 158 is hermetically (mainly to prevent water intrusion) connected to the housing 101 of the gas density relay body 1, and the opening of the outer cover 158 faces the housing 101. The driving contact operating mechanism 15 is configured to indirectly cause a corresponding displacement of the signal operating mechanism 111 of the gas density relay body 1, thereby causing the gas density relay body 1 to generate a contact signal operation.

[0134] The movement mechanism 105 of the gas density relay body 1 includes a sector gear 1051 and a central gear. The first end of the sector gear 1051 meshes with the central gear, and the second end of the sector gear 1051 is connected to the other end of the temperature compensation element 104 through a connecting rod 112 or directly. One end of the second end of the sector gear 1051 is fixedly connected to one end of a sector gear contact member 1051A. The other end of the sector gear contact member 1051A extends out of the housing 101 of the gas density relay body 1 through the air hole of the housing 101 and is arranged opposite to the end of the push rod 153 of the driving contact operating mechanism 15 away from the force applying mechanism. The driving component 151 and the force transmission component 152 apply a force to the sector gear contact member 1051A through the push rod 153, causing a displacement of the second end of the sector gear 1051. The first end of the sector gear 1051 meshing with the central gear drives the central gear to rotate. The central gear and the pointer 106 are both installed on the driving rod. The rotation of the central gear drives the driving rod to rotate, causing the pointer 106 to move and indicate at a certain scale on the scale disk 107.

[0135] A force measuring sensor 16 (in this case, a pressure sensor, or a displacement sensor, or a deformation amount sensor, or an optoelectronic sensor, or a strain gauge sensor) is arranged on the driving contact operating mechanism 15 and can detect the force F applied by the push rod 153 to the sector gear contact member 1051A.

[0136] Its working principle is as follows: When the driving component 151 does not apply force, the push rod 153 is away from the sector gear contact 1051A, and the push rod 153 does not apply force to the sector gear contact 1051A. During calibration, the driving component 151 applies a force F to the sector gear contact 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 action mechanism 111 is driven to generate a displacement, so that the adjusting member (such as an adjusting screw) on the signal action mechanism 111 pushes the signal generator 109, causing the contact of the signal generator 109 to be connected or disconnected, and driving the gas density relay body 1 to generate a contact signal action. At the same time, the intelligent control unit 7 obtains the pressure value P1 collected by the first pressure sensor 2 and the temperature value T collected by the temperature sensor 3 when the gas density relay body 1 generates a contact signal action or switches, as well as the force F collected by the force sensor 16. The force F is calculated or converted into a corresponding pressure value P2, and the equivalent gas pressure value P is calculated based on the pressure value P1 and the pressure value P2; 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.

[0137] 2) In this embodiment, the on-line calibration contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the joint 110. The first pressure sensor 2 is arranged on the base 102, and the temperature sensor 3 is arranged inside the housing 101. The first pressure sensor 2, the temperature sensor 3, the on-line calibration contact signal sampling unit 6, and the force sensor 16 are respectively connected to the intelligent control unit 7.

[0138] Embodiment 4:

[0139] As Figure 4 shown, a gas density relay or gas density monitoring device with an on-line self-calibration function provided by Embodiment 4 of the present invention. As Figure 4 shown, a gas density relay includes: a gas density relay body 1, a first pressure sensor 2, a temperature sensor 3, a force sensor 16, a driving contact action mechanism 15, an on-line calibration contact signal sampling unit 6, and an intelligent control unit 7.

[0140] The difference from Embodiment 1 is:

[0141] 1) The gas density relay body 1 of this embodiment adopts a bellows-type gas density relay. Specifically, it includes a housing 101, a first bellows 103 (i.e., a pressure detection element), a second bellows 113, a signal generator 109 (a microswitch 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 101, the second open end of the first bellows 103 is hermetically connected to a first seal 118, and the inner wall of the first bellows 103, the first seal 118, and the inner wall of the housing 101 together enclose a first sealed gas chamber G1, and a first 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, and the second open end of the second bellows 113 is connected to the inner wall of the housing 101 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 101 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 , that is, the second sealed gas chamber G2 is a temperature compensation standard gas chamber, constituting a temperature compensation element. The inner wall of the second bellows 113, the second seal 119, and the inner wall of the housing 101 together enclose a third gas chamber G3, and the third gas chamber G3 can be relatively sealed or semi-open. 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 fixing member, and a plurality of adjusting screws 10101 are arranged on the outside of the adjusting fixing member, and the plurality of adjusting screws 10101 are arranged corresponding to the corresponding 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 and / or higher than the set gas density, an alarm and / or locking contact signal is output through the signal generator 109.

[0142] The driving contact operating mechanism 15 is arranged inside the housing 101 of the gas density relay body 1, above the signal operating mechanism 111, and is configured to directly 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 as the moving rod moves, 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 alarm and locking signals.

[0143] When the force transmitting member 152 (cam) does not apply a 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 a force to the moving rod of the signal operating mechanism 111. When the force transmitting member 152 (cam) applies a force, the push rod 153 is affected by the driving member 151 and the force transmitting member 152, and the force F it applies to the return spring 154 can be obtained by detecting the deformation of the return spring 154 through the force measuring sensor 16 (F = L * N, where: L is the deformation, mm; N is the elastic coefficient, kg / mm). During calibration, the force transmitting member 152 rotates under the drive of the driving member 151, pushing the push rod 153 to move downward, and then applying a force F to the return spring 154 and the signal operating mechanism 111, that is, the driving member 151 applies a force to the signal operating mechanism 111 through the force transmitting member 152. The adjusting screw 10101 on the signal operating mechanism 111 pushes the signal generator 109, and the contacts of the signal generator 109 are closed, issuing corresponding contact signals (alarm or locking), that is, the driving contact operating mechanism 15 causes the gas density relay body 1 to generate contact signal actions. The force measuring sensor 16 is arranged at one end of the push rod 153 facing the force transmitting member, or can also be arranged above or below the adjusting and fixing member, and is arranged opposite to the adjusting and fixing member.

[0144] Working principle:

[0145] In the non-calibration state, the intelligent control unit 7 obtains the corresponding pressure value P at 20°C 20 (i.e., the gas density value) by monitoring the gas pressure and temperature of the electrical equipment 8 according to the first pressure sensor 2 and the temperature sensor 3, which can be remotely transmitted for online monitoring, that is, the intelligent control unit 7 obtains the gas density values collected by the first pressure sensor 2 and the temperature sensor 3; or, the intelligent control unit 7 obtains the pressure value collected by the first pressure sensor 2 and the temperature value collected by the temperature sensor 3 to complete the online monitoring of the gas density of the electrical equipment monitored by the gas density relay. At this time, the gas density value of the first sealed gas chamber G1 is greater than the gas density value of the third gas chamber G3, that is, the difference between the gas density value of the first sealed gas chamber G1 and the gas density value of the third gas chamber G3 is greater than a certain set value. From Figure 3It can be seen that there is a corresponding distance between the adjusting screw 10101 of the signal action mechanism 111 and the signal generator 109. At this time, the adjusting screw 10101 does not contact the signal generator 109, that is, the signal generator 109 is not triggered, the signal generator 109 does not act, and its contact signal is not output.

[0146] When the density relay body 1 needs to be checked, the intelligent control unit 7 controls the driving component 151 of the contact action mechanism 15 to drive the force transmission member 152 to rotate, and the force transmission member 152 rotates to push the push rod 153 to move downward, thereby applying a force F to the reset spring 154 and the signal action mechanism 111, that is, the driving component 151 applies a force F to the moving rod of the signal action mechanism 111 through the force transmission member 152, and the pressure acting on the upper end surface of the first bellows 103 increases, driving the first bellows 103 to move downward and deform. The moving rod moves downward, so that the distance between the adjustment screw 10101 and the signal generator 109 decreases. When the distance is less than the corresponding value, the adjustment screw 10101 of the signal action mechanism 111 contacts the signal generator 109, that is, the signal generator 109 is triggered, and the contact of the signal generator 109 is actuated (connected), and the corresponding contact signal (alarm or lockout) is issued. The contact action is uploaded to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the pressure value P1 collected by the first pressure sensor 2 and the temperature value T collected by the temperature sensor 3 when the contact signal of the gas density relay body 1 is actuated or switched, and the force F collected by the force sensor 16, and 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, it is converted into a pressure value corresponding to 20°C, that is, the gas density value P 20 Alternatively, the intelligent control unit 7 obtains the gas density value P1 collected by the first pressure sensor 2 and the temperature sensor 3 when the contact signal of the gas density relay body 1 is actuated or switched. 20 , and the force F collected by the force sensor 16, combined with the temperature value T collected by the temperature sensor 3, 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. Further, when the gas density relay body 1 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 characteristics, it is converted into a pressure value corresponding to 20°C, that is, the gas density value P20 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 gas density relay; 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 to complete the on-line calibration of the gas density relay. Or alternatively, when the contact signal of the gas density relay body 1 acts or switches, its gas density value P 20 and gas density value P1 20 、P2 20 The corresponding relationship between them 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 density value P1 20 and 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 The corresponding relationship between and the gas pressure values P1, P2 and the temperature value T is 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 to complete the on-line calibration of the gas density relay. Calibrate repeatedly for multiple times (for example, 2 - 3 times), and then calculate its average value, so as to complete the calibration work of the gas density relay. 20 Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. The control circuit of the gas density relay body 1 is connected through the intelligent control unit 7, and the density monitoring circuit of the gas density relay body 1 works normally. The gas density relay body 1 monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. In this way, it is convenient to complete the on-line calibration work of the gas density relay, and at the same time, the on-line calibration of the gas density relay will not affect the safe operation of the electrical equipment.

[0147] Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1. At this time, the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. The control circuit of the gas density relay body 1 is connected through the intelligent control unit 7. The density monitoring circuit of the gas density relay body 1 works normally. The gas density relay body 1 monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. In this way, it is convenient to complete the on-line calibration work of the gas density relay, and at the same time, the on-line calibration of the gas density relay will not affect the safe operation of the electrical equipment.

[0148] In summary, the present application provides a gas density relay with an online self-checking function and its checking method for high-voltage and medium-voltage electrical equipment, including a gas density relay body, a first pressure sensor, a temperature sensor, a force sensor, a driving contact operating mechanism, and an intelligent control unit. The driving contact operating mechanism is configured to apply a force to at least one main component of the gas density relay body. For example, it drives the end seat, or the pressure detection component, or the movement core of the gas density relay body to displace, thereby causing the signal operating mechanism to displace and making the contact signal of the gas density relay body act; or the driving contact operating mechanism directly drives the signal operating mechanism of the gas density relay body to displace, making the contact signal of the gas density relay body act. The force sensor is connected to or associated with the driving contact operating mechanism or at least one main component of the gas density relay body, and is used to detect the force applied by the force-applying mechanism to the main component of the gas density relay body. Here, the main components may include: a pressure detection component, an end seat, a temperature compensation component, a signal generator, a signal operating mechanism, a movement core, and a pointer. Alternatively, at least one diagnostic sensor may be provided on the gas density relay body to collect at least one of the corresponding position, and / or corresponding displacement, and / or corresponding deformation amount of the main components of the gas density relay body. According to the gas pressure during monitoring and the force applied by the driving contact operating mechanism, it is judged whether the data monitored by the diagnostic sensor meets the preset requirements, so as to diagnose whether the current working state of the gas density relay body is a normal working state. When a contact action occurs, the intelligent control unit detects the alarm and / or locking contact signal action value and / or return value of the gas density relay body according to the density value at the time of contact action, and the checking work of the gas density relay can be completed without the maintenance personnel going to the site, improving the reliability of the power grid, improving work efficiency, reducing operation and maintenance costs, and realizing the maintenance-free of the gas density relay. At the same time, the entire checking process realizes zero emission of SF6 gas, meeting the requirements of environmental protection regulations. Most importantly, due to the technical innovation of the present invention: the driving contact operating mechanism is not connected to the main gas path of SF6 of the gas density relay body or electrical equipment, which can greatly improve the reliability of the power grid, reduce its sealing requirements, and reduce manufacturing costs, improving the convenience and flexibility of on-site installation. The present application realizes online checking of the gas density relay, and further realizes the intelligent management of the entire life cycle of the gas density relay: repair only when there is a problem, and no operation and maintenance services are required when there is no problem.

[0149] It should be noted that a gas density relay with an online self-checking function generally refers to an integrated structure of its components; while a gas density monitoring device generally refers to a split structure of its components, which can be flexibly assembled. The gas density relay can be technically transformed and upgraded by using the original gas density relay in the substation.

[0150] 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 gas density relay with an online self-checking function, characterized in that, Comprising: The gas density relay body, a first pressure sensor, a temperature sensor, a force sensor, a driving contact operating mechanism, and an intelligent control unit; 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 provided inside the housing; The first pressure sensor is communicated with the pressure detection element of the gas density relay body; The driving contact operating mechanism is arranged inside or outside the housing and includes a force applying mechanism and a motion mechanism. The force applying mechanism includes a driving component and a force transmitting member driven by the driving component. The motion mechanism includes a push rod. The push rod moves under the drive of the force applying mechanism to directly or indirectly displace the signal operating mechanism, so as to trigger the signal generator to generate a contact signal action; The force sensor is arranged on the driving contact operating mechanism or inside the housing and is configured to detect the magnitude of the force applied by the driving contact operating mechanism to the gas density relay body; The intelligent control unit is respectively connected to the driving contact operating mechanism, the first pressure sensor, the temperature sensor, and the force sensor, and is configured to complete the control of the driving contact operating mechanism, the acquisition of the pressure value and the temperature value, and / or the acquisition of the gas density value, or / and to detect the contact signal action value and / or the contact signal return value of the gas density relay body; Wherein, the contact signal includes alarm and / or locking.

2. The gas density relay according to claim 1, characterized in that: The signal generator includes a microswitch or a magnetic-assisted electric contact. The gas density relay body outputs a contact signal through the signal generator; the temperature compensation element adopts a temperature compensation sheet or the gas enclosed in the housing; the pressure detection element includes a Bourdon tube or a bellows.

3. The gas density relay according to claim 1, characterized in that: The force sensor includes one of a gravity sensor, a pressure sensor, a magnetic sensor, a displacement sensor, a deformation amount sensor, an optical sensor, an angle sensor, and a camera.

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

5. The gas density relay according to claim 1, characterized in that: 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.

6. The gas density relay according to claim 1, characterized in that: The force sensor is arranged on the push rod of the driving contact operating mechanism; or, The force sensor is arranged on the pressure detection element; or, The force sensor is arranged on the temperature compensation element; or, The force sensor is arranged on the signal operating mechanism.

7. The gas density relay according to claim 1, characterized in that: The gas density relay body further includes a base, an end seat, and a movement mechanism disposed within the housing; the movement mechanism is fixed to the base; the pressure detection element is a Bourdon tube filled with a sealed gas, one end of which is fixed to and communicates 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 adjustment 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 a contact signal through the signal generator; the contact driving mechanism is disposed outside the housing of the gas density relay body, and the contact driving 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 within the outer cover; alternatively, the contact driving mechanism is disposed within the housing of the gas density relay body.

8. The gas density relay according to claim 7, characterized in that: A fixing member is provided at one end of the push rod facing the force applying mechanism, the fixing member is fixed within the outer cover, the other end of the push rod penetrates through and is fixed to a fixing frame at the opening of the outer cover, and the end of the push rod extending out of the fixing frame extends into the housing through a pore on the housing of the gas density relay body; an end seat contact plate is provided on the end seat within the housing, and the end of the push rod extending into the housing is disposed opposite to the end seat contact plate.

9. The gas density relay according to claim 8, characterized in that: The force measuring sensor is connected to the push rod through a contact member, or the force measuring sensor is directly connected to the push rod.

10. The gas density relay according to claim 8, characterized in that: A return spring is sleeved on the push rod between the fixing member and the fixing frame.

11. The gas density relay according to claim 10, characterized in that: The force transmission 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 cam, and the return spring is in a natural extended state; the driving component drives the cam to rotate, the convex portion of the cam strikes the push rod to drive 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.

12. The gas density relay according to claim 7, characterized in that: One end of the push rod facing the force applying mechanism passes through a fixing frame, the fixing frame is fixedly provided 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 within the housing.

13. The gas density relay according to claim 12, characterized in that: The force measuring sensor is in contact with the pressure detection element through a contact member, or the force measuring sensor is directly in contact with the pressure detection element.

14. The gas density relay according to claim 12, characterized in that: A return spring is sleeved on the push rod between the fixing frame and the pore.

15. The gas density relay according to claim 7, wherein: The movement 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 of the gas density relay body through a pore of the housing and is oppositely arranged with one end of the push rod of the driving contact operating mechanism away from the force applying mechanism.

16. The gas density relay according to claim 1, wherein: The gas density relay body includes a first bellows serving as a pressure detection element arranged in the housing, and also includes a second bellows. The first open end of the first bellows is fixed on 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 jointly 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 jointly 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 jointly enclose a third gas chamber, and the signal generator and the signal operating mechanism are arranged in the third gas chamber. The signal operating mechanism is connected to the first seal, and the signal generator is arranged corresponding to the signal operating mechanism; the driving contact operating 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 transmitting member, and the end of the push rod away from the force transmitting member penetrates through a fixing bracket fixed to the inner wall of the housing and extends below the fixing bracket and is oppositely arranged with the signal operating mechanism.

17. The gas density relay according to claim 16, wherein: The outer diameter of the first bellows is larger than the outer diameter of the second bellows.

18. The gas density relay according to claim 16, wherein: The signal operating mechanism includes a moving rod. One end of the moving rod extends into the second bellows, is connected to the first seal, 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 the adjusting fixing member is provided with an adjusting screw, and the adjusting screw is used to touch the signal generator under the driving force of the moving rod.

19. The gas density relay according to claim 16, wherein: A return spring is sleeved on the push rod between the fixing member and the fixing bracket.

20. The gas density relay according to claim 16, wherein: The force measuring sensor is arranged at one end of the push rod facing the force transmitting member, or the force measuring sensor is arranged at one end of the push rod facing away from the force transmitting member.

21. The gas density relay according to claim 1, wherein: The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, 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 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 first pressure sensor and the temperature sensor when the contact signal of the gas density relay body acts or switches 20 , and the force F collected by the force sensor, combines with the temperature value T collected by the temperature sensor, and through calculation or conversion becomes 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 , complete the on-line calibration of the gas density relay; or The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, and calculates the corresponding gas density value P based on the pressure value P1, T, and F 20 , and completes the on-line calibration of the gas density relay.

22. The gas density relay according to claim 1, wherein: It further includes an on-line calibration contact signal sampling unit, and the on-line calibration contact signal sampling unit 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.

23. The gas density relay according to claim 22, 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 contact actuating mechanism, 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.

24. The gas density relay according to claim 22, wherein: It further includes a multi-way joint, and one or more of the gas density relay body, the first pressure sensor, the contact actuating mechanism, the on-line calibration contact signal sampling unit, the intelligent control unit, and the temperature sensor are arranged on the multi-way joint.

25. 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.

26. 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.

27. A gas density monitoring device with an online self-checking function, wherein, The gas density monitoring device includes a gas density relay with an on-line self-calibration function according to any one of claims 1-26.

28. A calibration method for a gas density relay with an online self-checking function as claimed in claim 1, wherein, Including: In the normal working state, the gas density relay monitors the gas density value in the electrical equipment. According to the set calibration time or / and calibration instruction, and the gas density value, when it is allowed to calibrate the gas density relay: The intelligent control unit drives the contact operating mechanism, so that the moving mechanism driving the contact operating mechanism applies a force to the components inside the gas density relay body under the drive of the force applying mechanism, causing the signal operating mechanism of the gas density relay body to displace, triggering the signal generator to generate a contact signal operation; the intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force measuring sensor when the gas density relay body has a contact signal operation or a switch, 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 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 , complete the on-line calibration of the gas density relay; or, The intelligent control unit obtains the gas density value P1 collected by the first pressure sensor and the temperature sensor when the contact signal of the gas density relay body acts or switches 20 , and the force F collected by the force sensor, combines with the temperature value T collected by the temperature sensor, and through calculation or conversion, it becomes 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 , to complete the on-line calibration of the gas density relay; or The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, and calculates the corresponding gas density value P based on the pressure value P1, T, and F, so as to complete the on-line calibration of the gas density relay. 20 , and complete the on-line calibration of the gas density relay; When all the contact signal calibration work is completed, the intelligent control unit restores the contact actuating mechanism.

29. The calibration method of the gas density relay with an online self-checking function according to claim 28, characterized in that, The gas density relay 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; the calibration method includes: In the normal working state, the gas density relay monitors the gas density value in the electrical equipment, and at the same time, the gas density relay on-line monitors the gas density value in the electrical equipment through the first pressure sensor, the temperature sensor, and the intelligent control unit. According to the set calibration time or / and calibration instruction, and the gas density value, when it is allowed to calibrate the gas density relay: The intelligent control unit adjusts the on-line calibration contact signal sampling unit to the calibration state. In the calibration state, the on-line calibration contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit. The intelligent control unit drives the contact operating mechanism, so that the moving mechanism of the contact operating mechanism applies a force to the components inside the gas density relay body under the drive of the force applying mechanism, causing the signal operating mechanism of the gas density relay body to displace, triggering the signal generator to generate a contact signal operation. The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force measuring sensor when the gas density relay body has a contact signal operation or a switchover. The force F is calculated or converted into a corresponding pressure value P2, and the equivalent gas pressure value P is calculated 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 , the on-line calibration of the gas density relay is completed; or, The intelligent control unit obtains the gas density value P1 collected by the first pressure sensor and the temperature sensor when the contact signal of the gas density relay body acts or switches 20 , and the force F collected by the force sensor, combines with the temperature value T collected by the temperature sensor, and is calculated or converted 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 , to complete the on-line calibration of the gas density relay; or The intelligent control unit obtains the pressure value P1 collected by the first pressure sensor, the temperature value T collected by the temperature sensor, and the force F collected by the force sensor when the contact signal of the gas density relay body acts or switches, and calculates the corresponding gas density value P based on the pressure value P1, T, and F, so as to complete the on-line calibration of the gas density relay. 20 , and complete the on-line calibration of the gas density relay; When all the contact signal calibration work is completed, the intelligent control unit restores the contact actuating mechanism and adjusts the on-line calibration contact signal sampling unit to the working state, and the control loop of the contact signal of the gas density relay body resumes normal operation.

30. The calibration method of the gas density relay with an online self-checking function according to claim 28 or 29, characterized in that, Including: 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 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, its equivalent gas pressure value P = P1 - P2 * K; where K 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 , P2 20 The corresponding relationship between them is pre-designed into 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 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 among the gas density value P, the gas pressure values P1 and 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 and P2 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 force 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 force F collected by the force sensor, and the temperature value T 20 , to complete the on-line calibration of the gas density relay body.

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