Anti-vibration sulfur hexafluoride gas density monitoring device and verification method thereof

Abstract

According to the sulfur hexafluoride gas density monitoring device with the anti-vibration characteristic and the verification method of the sulfur hexafluoride gas density monitoring device, the outer sides of a first corrugated pipe and a second corrugated pipe are sleeved with guide cylinders, and the guide cylinders can prevent the first corrugated pipe and the second corrugated pipe from inclining and deforming due to external vibration; the anti-vibration performance can be improved as a result of the deformation damage of the anti-vibration device or the misoperation of the microswitch; through the design of the stroke amplification mechanism, the change of the expansion amount of the corrugated pipe generated by the change of the air pressure in the first corrugated pipe is amplified and converted into the stroke amount for pressing or loosening the microswitch through the driving rod, so that the microswitch can have a relatively large operation stroke for the change of the unit air pressure; and when vibration is generated outside, the vibration of the driving rod and the pressing column does not cause misoperation of the microswitch, so that the stability and accuracy of the device in a vibration environment are improved, and the anti-vibration performance is relatively good.

Description

Technical Field

[0001] The present invention relates to a sulfur hexafluoride gas density monitoring device and a calibration method thereof, in particular to a sulfur hexafluoride gas density monitoring device with anti-vibration characteristics and a calibration method thereof, which are suitable for power systems and other occasions requiring accurate monitoring of SF6 gas density. Background Art

[0002] In the power industry, the operation and proper functioning of high-voltage electrical equipment is inseparable from insulating gases such as sulfur hexafluoride (SF6) for arc extinguishing and insulation. Therefore, for insulated electrical products equipped with sealed SF6 or other insulating gas chambers, ensuring that the chambers are leak-proof is a fundamental requirement. If the gas leaks, the reduced gas density will seriously affect the electrical performance of the equipment, posing a serious risk to its safe operation. Currently, mechanical pointer-type SF6 gas density relays are commonly used to monitor the density of insulating gases such as SF6.

[0003] At the same time, with the development of unmanned substations towards networking and digitalization, online monitoring of the gas density status of SF6 electrical equipment has become increasingly common. Online monitoring of gas density values ​​in SF6 high-voltage electrical equipment has also become commonplace. Especially with the State Grid's initiative to build a ubiquitous power internet of things (PoI), the use of gas density relays will become increasingly widespread. This, in turn, significantly increases the calibration workload for SF6 and other insulating gas density relays. Manual calibration is inefficient and increases operating costs. High-voltage substations operate in harsh environments, particularly during system operation, generating high vibration levels that can damage components within remote density relays or cause malfunctions. This, in turn, can affect the accuracy and functionality of remote SF6 gas density relays, resulting in poor or no remote signal and unreliable operation. In short, currently used remote SF6 gas density relays suffer from poor vibration resistance and are prone to damage and malfunction, making them inadequate to meet the requirements of the PoI. Furthermore, regular on-site calibration requires manual personnel, which is time-consuming, labor-intensive, and costly. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a sulfur hexafluoride gas density monitoring device with vibration resistance and a calibration method thereof, which has good vibration resistance.

[0005] To achieve the above object, the present invention provides a vibration-resistant sulfur hexafluoride gas density monitoring device, comprising a housing, the housing being divided into a first chamber and a second chamber by a partition plate, and further comprising:

[0006] A base is disposed in the first chamber, the base is connected to an inflation connector mounted on the outside of the shell, and an air passage is provided in the base;

[0007] A pointer display mechanism, comprising a Baden tube and a pointer mechanism, wherein the Baden tube is connected to an air passage in the base;

[0008] The stroke amplification mechanism includes a first bellows and a second bellows arranged in parallel, the lower end of the first bellows is fixed to the left side of the base, the lower end of the second bellows is fixed to the right side of the base, the first bellows is connected to the air passage in the base, and the second bellows is pre-filled with compensation gas; a guide cylinder is sleeved on the outer side of the first bellows and the second bellows, and the lower end of the guide cylinder is fixed to the base; a support rod is provided between the first bellows and the second bellows, the distance between the support rod and the first bellows is smaller than the distance between the support rod and the second bellows, the upper end of the support rod is hinged to a lever, the left end of the lever is hinged to a first connecting rod, the lower end of the first connecting rod is hinged to the upper end of the first bellows; the right end of the lever is hinged to the second connecting rod, and the lower end of the second connecting rod is hinged to the upper end of the second bellows;

[0009] A micro switch comprises a drive rod, a guide plate, and a switch device. The upper end of the drive rod is connected to a crossbar, and a pressing column is connected to the crossbar. The pressing column is aligned with the switch device. The middle portion of the drive rod passes through a guide hole in the guide plate. The lower end of the drive rod is hinged to a lever. The drive rod is driven by the lever to cause the pressing column to press or release the switch device.

[0010] The signal acquisition device includes a MEMS pressure sensor, which is communicatively connected to the intelligent control unit, which is communicatively connected to the host computer. The MEMS pressure sensor is connected to the partition plate, and the air pressure acquisition portion of the MEMS pressure sensor is connected to the airway in the base. The MEMS pressure sensor transmits the acquired signal to the intelligent control unit for processing.

[0011] Preferably, the signal acquisition device further includes a MEMS temperature sensor, which is connected to the partition plate. The air temperature acquisition end of the MEMS temperature sensor is located in the first chamber, and the MEMS temperature sensor transmits the acquired signal to the intelligent control unit for processing.

[0012] Preferably, the micro switch is communicatively connected to the intelligent control unit, and the micro switch transmits a switch signal to the intelligent control unit.

[0013] Preferably, the intelligent control unit has a communication interface, and the communication interface is used to connect to a host computer, a storage device or a printing device.

[0014] Preferably, the upper end of the driving rod has a threaded connector, the middle portion of the cross bar is provided with a threaded hole for connecting the threaded connector, the threaded connector is connected in the threaded hole, and a compression nut is also provided on the threaded connector.

[0015] Preferably, a threaded hole for connecting a pressing column is provided on the cross bar, and the pressing column is threadedly connected in the threaded hole.

[0016] Preferably, the lower end of the driving rod is hinged to the lever via a universal joint.

[0017] Preferably, the shell is a rectangular parallelepiped structure, and the inflation joint is sealed to the shell.

[0018] Preferably, a multi-way connector is also connected to the inflation connector, and the multi-way connector has a first interface, a second interface and a third interface. The first interface is connected to the inflation connector, and the second interface is connected to the insulating air chamber of the electrical equipment. A solenoid valve is provided between the second interface and the insulating air chamber of the electrical equipment, and the solenoid valve is communicatively connected to the intelligent control unit, and the intelligent control unit controls the solenoid valve to be closed or connected; the third interface is connected to the air pressure regulating mechanism.

[0019] Furthermore, the air pressure regulating mechanism includes a pressure regulating bellows, a push rod and a motor. The motor is communicatively connected to the intelligent control unit. The intelligent control unit controls the motor to drive the push rod to move and drive the pressure regulating bellows to expand and contract, thereby regulating the gas pressure in the base airway.

[0020] The present invention also relates to a calibration method for a vibration-resistant sulfur hexafluoride gas density monitoring device, which is performed using the vibration-resistant sulfur hexafluoride gas density monitoring device described in the above technical solution, comprising the following steps:

[0021] 1) Setting the calibration time of the sulfur hexafluoride gas density monitoring device or / issuing a calibration instruction;

[0022] 2) When the calibration time is reached or a calibration instruction is received, the signal acquisition device is adjusted to the calibration state through the intelligent control unit. In the calibration state, the signal acquisition device cuts off the control loop of the gas density relay contact signal and connects the gas density relay contact to the intelligent control unit;

[0023] 3) The intelligent control unit controls the air pressure regulating mechanism, which causes the pressure regulating bellows to expand and contract to adjust the gas pressure value. The intelligent control unit adjusts the gas pressure of the gas density relay by changing the pressure of the pressure regulating bellows of the air pressure regulating mechanism;

[0024] 4) When the pressure increases, the intelligent control unit controls the solenoid valve to close, thereby shutting off the gas path between the gas density relay and the electrical equipment; then, the gas pressure is slowly reduced, causing the gas density relay to generate an alarm and a lockout signal contact action. The contact action is transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the alarm and lockout signal contacts are actuated, or directly obtains the gas density value P20, detects the alarm and lockout contact signal action values ​​of the gas density relay, and completes the calibration of the contact signal action value of the gas density relay;

[0025] 5) The intelligent control unit drives the air pressure regulating mechanism to slowly increase the gas pressure, causing the gas density relay to alarm and reset the lockout signal contacts. The alarm and lockout signal contact resets are transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the contacts are reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return values ​​of the gas density relay, and completes the verification of the contact signal return value of the gas density relay;

[0026] 6) When all contact signal verification work is completed, the intelligent control unit controls the solenoid valve to open, so that the gas density relay and the gas circuit of the electrical equipment are interconnected, and the signal acquisition device is adjusted to the working state, and the control circuit of the contact signal of the gas density relay resumes normal working state.

[0027] As described above, the present invention relates to a vibration-resistant sulfur hexafluoride gas density monitoring device and a calibration method thereof, which have the following beneficial effects: Compared with the prior art, the vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention, on the one hand, by sleeved with a guide cylinder on the outside of the first bellows and the second bellows, the guide cylinder can prevent the first bellows and the second bellows from tilting and deforming due to external vibration, which may cause deformation and damage to the first bellows or misoperation of the micro switch, thereby improving the vibration resistance. On the other hand, through the design of the stroke amplification mechanism, the change in the bellows expansion and contraction caused by the change in air pressure in the first bellows is amplified and converted into the stroke of pressing or releasing the micro switch through the drive rod, so that the micro switch can have a larger operating stroke for unit air pressure change. In this way, when external vibration occurs, the vibration of the drive rod and the pressing column will not cause misoperation of the micro switch, thereby improving the stability and accuracy of the device in a vibration environment and having better vibration resistance. In addition, the vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention realizes real-time monitoring of SF6 gas density and temperature through integrated MEMS pressure sensors and temperature sensors. The intelligent control unit can process the collected signals and communicate with external devices, thereby improving the intelligence level of monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front view of a sulfur hexafluoride gas density monitoring device with vibration resistance according to the present invention;

[0029] Figure 2 A partial side cross-sectional view of a sulfur hexafluoride gas density monitoring device with vibration resistance according to the present invention;

[0030] Figure 3 This is a circuit diagram of a sulfur hexafluoride gas density monitoring device with anti-vibration characteristics when not self-calibrating;

[0031] Figure 4 This is a circuit diagram of a sulfur hexafluoride gas density monitoring device with anti-vibration characteristics during self-calibration according to the present invention;

[0032] Component number description

[0033] 1 Density relay housing

[0034] 101 First Chamber

[0035] 102 base

[0036] 103 Baden-Württemberg

[0037] 104 Metal temperature compensation element

[0038] 105 movement

[0039] 106 pointers

[0040] 107 dial

[0041] 108 Baden tube sealing cap

[0042] 109 Micro switch

[0043] 110 crossbar

[0044] 111 Pressing column

[0045] 112 guide plate

[0046] 113 drive rod

[0047] 114 Universal Connector

[0048] 115A first connecting rod

[0049] 115B Second connecting rod

[0050] 116A First guide cylinder

[0051] 116B Second guide cylinder

[0052] 117A First fixed seat

[0053] 117B Second fixed seat

[0054] 118A First bellows

[0055] 118B Second bellows

[0056] 119 support rod

[0057] 120 base

[0058] 121 Leverage

[0059] 122 fixing nut

[0060] 123 trachea

[0061] 124 Second Chamber

[0062] 2 MEMS pressure sensor

[0063] 3 MEMS temperature sensor

[0064] 4 Solenoid valve

[0065] 5. Air pressure regulating mechanism

[0066] 501 pressure regulating bellows

[0067] 502 Push rod

[0068] 503 Motor

[0069] 6 Signal acquisition device

[0070] 7 Intelligent control unit

[0071] 8 Inflatable connector

[0072] 9 Multi-way connector

[0073] 901 First Interface

[0074] 902 Second Interface

[0075] 903 Third Interface

[0076] 10 Insulation chamber DETAILED DESCRIPTION

[0077] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0078] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0079] like Figure 1 and Figure 2 As shown, the present invention provides a vibration-resistant sulfur hexafluoride gas density monitoring device, comprising a housing, wherein the housing is divided into a first chamber 101 and a second chamber 124 by a partition plate, and further comprising:

[0080] The base 102 is disposed in the first chamber 101 and is connected to the inflation connector 8 installed on the outside of the shell. An air passage is provided in the base 102;

[0081] The pointer 106 display mechanism includes a Baden tube 103 and a pointer 106 mechanism, wherein the Baden tube 103 is connected to the air passage in the base 102;

[0082] The stroke amplification mechanism includes a first bellows 118A and a second bellows 118B arranged in parallel. The lower end of the first bellows 118A is fixed to the left side of the base 102, and the lower end of the second bellows 118B is fixed to the right side of the base 102. The first bellows 118A is connected to the air passage in the base 102, and the second bellows 118B is pre-filled with compensation gas; the outer sides of the first bellows 118A and the second bellows 118B are provided with a guide cylinder, and the lower end of the guide cylinder is fixed to the base 102; the first bellows 118A and the second bellows 118B are connected to the air passage in the base 102, and the second bellows 118B are pre-filled with compensation gas; the outer sides of the first bellows 118A and the second bellows 118B are provided with a guide cylinder, and the lower end of the guide cylinder is fixed to the base 102; A support rod 119 is provided between the two bellows 118B. The distance between the support rod 119 and the first bellows 118A is smaller than the distance between the support rod 119 and the second bellows 118B. The upper end of the support rod 119 is hinged to a lever 121. The left end of the lever 121 is hinged to a first connecting rod 115A. The lower end of the first connecting rod 115A is hinged to the upper end of the first bellows 118A. The right end of the lever 121 is hinged to a second connecting rod 115B. The lower end of the second connecting rod 115B is hinged to the upper end of the second bellows 118B.

[0083] Micro switch 109 includes a drive rod 113, a guide plate 112, and a switch device. The upper end of drive rod 113 is connected to cross bar 110, and a pressing column 111 is connected to cross bar 110. Pressing column 111 is aligned with the switch device. The middle portion of drive rod 113 passes through a guide hole in guide plate 112. The lower end of drive rod 113 is hinged to lever 121. Drive rod 113 is driven by lever 121, causing pressing column 111 to press or release the switch device.

[0084] The signal acquisition device 6 includes a MEMS pressure sensor 2, which is communicatively connected to the intelligent control unit 7, and the intelligent control unit 7 is communicatively connected to the host computer. The MEMS pressure sensor 2 is connected to the partition plate and fixed by a fixing nut 122. The air pressure acquisition port of the MEMS pressure sensor 2 is connected to the airway in the base 102. The MEMS pressure sensor 2 transmits the collected signal to the intelligent control unit 7 for processing.

[0085] Compared to the prior art, the present invention provides a vibration-resistant sulfur hexafluoride gas density monitoring device. On the one hand, by providing a guide tube sleeved outside the first bellows 118A and the second bellows 118B, the guide tube prevents the first bellows 118A and the second bellows 118B from tilting and deforming due to external vibration, which could cause deformation and damage to the first bellows 118A or misoperation of the microswitch 109, thereby improving vibration resistance. On the other hand, through the design of a stroke amplification mechanism, the change in bellows expansion and contraction caused by the pressure change in the first bellows 118A is amplified and converted into the stroke required to press or release the microswitch 109 via the drive rod 113, thereby enabling the microswitch 109 to have a larger operating stroke per unit pressure change. Thus, when external vibration occurs, the vibration of the drive rod 113 and the pressing column 111 will not cause the microswitch 109 to misoperate, thereby improving the stability and accuracy of the device in a vibrating environment and achieving better vibration resistance. In addition, the vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention realizes real-time monitoring of SF6 gas density and temperature through the integrated MEMS pressure sensor 2 and temperature sensor. The intelligent control unit 7 can process the collected signals and communicate with external devices, thereby improving the intelligent level of monitoring.

[0086] The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention features a rectangular parallelepiped housing, facilitating a sealed connection between the inflatable connector 8 and the housing. The density relay housing 1 is divided into a first chamber 101 and a second chamber 124 by a partition. This design helps isolate different functional components, improving the stability and safety of the device.

[0087] The base 102 is located within the first chamber 101 and is connected to the gas charging connector 8 outside the housing to introduce gas from the insulating gas chamber 10 of the electrical equipment. The base 102 is used to mount components such as the Baden tube 103, the first bellows 118A, and the second bellows 118B. The base 102 includes an airway, which serves as a passage for gas flow and connects to various monitoring and control components. One end of the Baden tube 103 is connected to the base 102 and communicates with the airway, while the other end is sealed by a Baden tube sealing cap 108. The Baden tube is a device that uses the principle of gas expansion to measure gas pressure. As the density of SF6 gas changes, the gas pressure in the Baden tube 103 changes and deforms, driving the pointer 106 mechanism to visually display the gas density.

[0088] The stroke amplification mechanism includes two bellows arranged in parallel. The first bellows 118A is connected to the airway and is used to drive the movement of the stroke amplification mechanism and control the on and off of the microswitch 109 according to the change of gas pressure in the insulating air chamber 10 of its equipment. The second bellows 118B is pre-filled with compensation gas. The second bellows 118B seals the compensation gas in its cavity to perform temperature compensation for the movement of the stroke amplification mechanism.

[0089] The present invention discloses a vibration-resistant sulfur hexafluoride gas density monitoring device. The stroke amplification effect of lever 121 enhances measurement accuracy while also providing stability and vibration resistance. The specific operating process is as follows: As the measured air pressure increases or decreases, it is ultimately converted into a corresponding displacement of the pressing column 111, which then moves up and down in response to the change in air pressure. Under the action of lever 121, since the stroke displacement of the pressing column 111 corresponds one-to-one with the air pressure value, the stroke displacement required to trigger the microswitch 109 button is amplified, meaning a larger displacement is required per unit change in air pressure. This helps improve the setting accuracy of the alarm pressure or locking pressure value, while also enhancing vibration resistance, minimizing the adverse effects of stroke displacement caused by environmental vibrations on accuracy and preventing false alarms. Furthermore, under the action of the first and second guide cylinders 116A, 116B, the bellows becomes more stable in the displacement direction, eliminating the effects of vibration on accuracy and improving stability and vibration resistance.

[0090] Signal acquisition device 6 includes a MEMS pressure sensor 2, which is attached to the partition plate. Its pressure acquisition port communicates with the airway in base 102, allowing direct measurement of SF6 gas pressure. MEMS pressure sensor 2 transmits the acquired signal to intelligent control unit 7 for processing. Intelligent control unit 7 performs further signal analysis and processing, such as temperature compensation and pressure calibration. It also communicates with a host computer to enable remote data transmission and monitoring.

[0091] In order to correct the influence of the ambient temperature, the signal acquisition device 6 also includes a MEMS temperature sensor 3, which is connected to the partition plate. The temperature acquisition end of the MEMS temperature sensor 3 is located in the first chamber 101. The MEMS temperature sensor 3 transmits the collected signal to the intelligent control unit 7 for processing. Figure 2 As shown, the second chamber 124 of the density relay housing 1 of a sulfur hexafluoride gas density monitoring device with vibration resistance of the present invention is provided with a MEMS pressure sensor 2 and a MEMS temperature sensor 3 for online monitoring of the gas pressure and temperature of the density relay housing 1, thereby obtaining the insulating gas density value. Figure 1 As shown, the inflation connector 8 is also connected to a multi-way connector 9, which has a first interface 901, a second interface 902, and a third interface 903. The first interface 901 is connected to the inflation connector 8, and the second interface 902 is connected to the insulating air chamber 10 of the electrical equipment. A solenoid valve 4 is provided between the second interface 902 and the insulating air chamber 10 of the electrical equipment. The solenoid valve 4 is communicatively connected to the intelligent control unit 7, which controls whether the solenoid valve 4 is closed or open. The third interface 903 is connected to the air pressure regulating mechanism 5. The air pressure regulating mechanism 5 can be designed and implemented in various ways. As a preferred embodiment, the air pressure regulating mechanism 5 includes a pressure regulating bellows 501, a push rod 502, and a motor 503. The motor 503 is communicatively connected to the intelligent control unit 7. The intelligent control unit 7 controls the motor 503 to drive the push rod 502 to move, thereby driving the pressure regulating bellows 501 to expand and contract, thereby regulating the gas pressure in the airway of the base 102. The air pressure regulating mechanism 5 is connected to the inflation connector 8 of the density relay housing 1 via a multi-way connector 9. It is installed in the insulated air chamber 10 of the electrical equipment via a solenoid valve 4. It regulates the gas pressure within the density relay housing 1, triggering contact signal activation. The density relay's self-calibration function is achieved through a signal acquisition device 6 and an intelligent control unit 7 located within the second chamber 124 of the density relay housing 1. The first chamber 101 of the density relay housing 1 houses a pointer display control unit and a contact signal control unit. These two units utilize independent control and monitoring. The density pointer 106 displays pressure using a Baden tube 103, while the contact signal is measured using a first bellows 118A. The density relay housing 1 utilizes a pressure measurement stroke amplification design, resulting in higher density monitoring accuracy and improved vibration resistance. The intelligent control unit 7 is electrically connected to the MEMS pressure sensor 2, MEMS temperature sensor 3, air pressure regulating mechanism 5, signal acquisition device 6, and the solenoid valve 4 located between the electrical equipment and the multi-way connector 9.

[0092] like Figure 1 and Figure 2As shown, one end of the Baden tube 103 is fixedly sealed to the base 102 and is in air communication with the base 102 and the inflation connector 8 via the air pipe 123. It is also in air communication with the first bellows 118A via the air pipe 123. The driving end of the movement 105 is connected to one end of the bimetallic temperature compensation element 104, the other end of which is connected to the other end of the Baden tube 103. The pointer 106 is mounted on the movement 105 and positioned in front of the dial 107. The movement 105, dial 107, and pointer 106 are all disposed within the first chamber 101.

[0093] Bimetallic temperature compensation element 104 is a temperature-sensitive "U"-shaped element. The opening and closing dimensions of its "U"-shaped end vary with temperature. This characteristic of bimetallic temperature compensation element 104 is used to reversely correct the relationship between the measured gas pressure and temperature, eliminating the effect of temperature on pressure and thereby reflecting changes in gas density. Baden tube 103 is an elastic element. Under the pressure of the measured gas, the end of Baden tube 103 is forced to undergo corresponding elastic deformation and displacement. The reverse correction of bimetallic temperature compensation element 104 transmits this corrected displacement to movement 105, which in turn transmits it to pointer 106, which in turn displays the measured gas density value on dial 107. This density relay eliminates the effect of temperature on pressure, thereby displaying the gas density value.

[0094] like Figure 1 and Figure 2As shown, the lower ends of the first bellows 118A and the second bellows 118B are respectively fixed on the base 120, and the base 120 is a part of the base 102. The upper ends of the first bellows 118A and the second bellows 118B are respectively sealed with the first fixing seat 117A and the second fixing seat 117B; the first fixing seat 117A and the second fixing seat 117B are respectively hinged to the lower ends of the first connecting rod 115A and the second connecting rod 115B; the upper ends of the first connecting rod 115A and the second connecting rod 115B are respectively connected to the movable link shafts at both ends of the lever 121 to ensure free rotation; a movable link shaft is provided on the lever 121, and a position at a non-middle side close to the first bellows 118A constitutes a stroke amplification effect of the lever 121; the movable link shaft on the lever 121 and the support One end of the support rod 119 is connected to ensure free rotation, and is fixed to the base 120 through the other end of the support rod 119; the lever 121 is provided with a universal connector 114 at one end on which the second connecting rod 115B is installed. The universal connector 114 is embedded in the end of the lever 121 and can rotate freely in any direction; a threaded hole is provided on the universal connector 114, which is connected to the drive rod 113 through a thread; the drive rod 113 is connected to the cross bar 110 through the hole on the guide plate 112 and is locked with a nut; the pressing column 111 is assembled on the threaded hole provided on the cross bar 110, and its protruding length relative to the surface of the cross bar 110 can be adjusted by rotation; the micro switch 109 is provided at the corresponding position of the corresponding pressing column 111 to ensure that the pressing column 111 can touch its switch contact.

[0095] The first bellows 118A is connected to the measured gas on the gas path as a pressure measuring element. When the gas density value changes and reaches the set value, compression or expansion produces axial displacement, which drives the lever 121 to swing through the first guide cylinder 116A. The lever 121 swings with the support rod 119 as the force fulcrum. Under the stroke amplification effect of the lever 121 effect, the driving rod 113 is driven to produce axial displacement under the guidance of the guide hole of the guide plate 112, and then the pressing column 111 is driven to touch the button on the corresponding micro switch 109, causing the micro switch 109 to produce the corresponding signal; at the same time, the second bellows 118B is sealed as a gas compensation element and is filled with a certain amount of compensation gas. The pressure of the compensation gas will change with the change of temperature. The pressure change causes the second bellows 118B to produce a corresponding axial displacement. This axial displacement is in a linear relationship with the displacement produced by the first bellows 118A, which offsets the pressure generated by the temperature change, realizes the reverse correction of the relationship between the pressure and temperature of the measured gas, eliminates the influence of temperature on pressure, and realizes gas density monitoring of the contact signal.

[0096] In order to facilitate the adjustment of the stroke of the driving rod 113 to trigger the micro switch 109 to be turned on and off, as shown in FIG. Figure 2As shown, the upper end of the drive rod 113 has a threaded connector, and the middle portion of the crossbar 110 is provided with a threaded hole for connecting the threaded connector. The threaded connector is connected to the threaded hole, and the threaded connector is also provided with a compression nut. The stroke of the drive rod 113 triggering the micro switch 109 can be adjusted by adjusting the depth of the threaded connector of the drive rod 113 screwed into the threaded hole on the crossbar 110. When adjusted to the set position, the compression nut is tightened to lock the crossbar 110 and the drive rod 113. To further fine-tune the stroke of the pressing post 111 triggering the micro switch 109, the crossbar 110 is provided with a threaded hole for the pressing post 111, which is threadedly connected to the threaded hole. To ensure that the connection point between the drive rod 113 and the lever 121 is flexible and does not get stuck, the lower end of the drive rod 113 is hinged to the lever 121 via a universal joint 114.

[0097] like Figure 3 and Figure 4As shown, the solenoid valve 4 is connected to the intelligent control unit 7 and opens or closes under the control of the intelligent control unit 7. The gas pressure regulating mechanism 5 adjusts the gas pressure in the density relay housing 1, causing the density relay housing 1 to generate a contact signal. The gas pressure regulating mechanism 5 uses the motor 503 to drive the push rod 502 to expand and contract the pressure regulating bellows 501, thereby adjusting the gas pressure. During normal operation, the solenoid valve 4 is open, and the gas density relay monitors the gas density within the electrical equipment. Simultaneously, the gas density relay monitors the gas density within the electrical equipment online via the MEMS pressure sensor 2, MEMS temperature sensor 3, and the intelligent control unit 7. The signal acquisition device 6 collects the contact signals of the gas density relay. The microswitch 109 is also part of the signal acquisition device 6 and is communicatively connected to the intelligent control unit 7, transmitting the switch signal to the intelligent control unit 7. The signal acquisition device 6 is also connected to the intelligent control unit 7. The intelligent control unit 7 can be a microprocessor-based embedded system with embedded algorithms and control programs to automatically control the entire monitoring process, including all peripherals, logic, and inputs and outputs. Intelligent control unit 77 is capable of converting the pressure and temperature values ​​measured by MEMS pressure sensor 2 and MEMS temperature sensor 3 into a corresponding pressure value P20 at 20°C based on gas properties. This constitutes a vibration-resistant, self-calibrating, remote-transmitting sulfur hexafluoride gas density monitoring device with pressure and temperature measurement and software conversion capabilities. Intelligent control unit 7 can measure both relative and absolute pressure gas densities. Intelligent control unit 7 also has a communication interface for connecting to a host computer, storage device, or printing device, enabling test data storage, export, printability, data communication with a host computer, and / or input of analog and digital information. The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention also features human-computer interaction: a data display interface that can refresh current data values ​​in real time, and a data input function that allows parameter setpoints to be entered. The electrical interface of the gas density relay can be protected to prevent damage to the interface due to misconnection.

[0098] The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention utilizes the coordinated work of various functional components to accurately and stably monitor the density of SF6 gas, maintaining high accuracy even in a vibration environment, and providing important protection for the safe operation of the power system.

[0099] Figure 3 、 Figure 4 This is a circuit diagram of a gas density monitoring device for high-voltage electrical equipment according to an embodiment of the present invention, wherein: Figure 3 This is a circuit diagram of a non-self-checking embodiment of the present invention. Figure 4 Schematic diagram of a circuit during self-checking in accordance with the first embodiment of the present invention.

[0100] by Figure 3 For example, the intelligent control unit 7 shown can be implemented using a general-purpose computer, an industrial computer, a CPU, a single-chip microcomputer, an ARM chip, an AI chip, a quantum chip, a photonic chip, an MCU, an FPGA, a PLC, an industrial control mainboard, an embedded main control board, etc.

[0101] See Figure 3 and Figure 4 As shown, the gas density monitoring device of this embodiment has a self-calibration function, and the working principle and steps of the self-calibration are as follows:

[0102] The present invention also relates to a calibration method for a vibration-resistant sulfur hexafluoride gas density monitoring device, which is performed using the vibration-resistant sulfur hexafluoride gas density monitoring device described in the above technical solution, comprising the following steps:

[0103] 1) Setting the calibration time of the sulfur hexafluoride gas density monitoring device or / issuing a calibration instruction;

[0104] 2) When the calibration time is reached or a calibration instruction is received, the signal acquisition device is adjusted to the calibration state through the intelligent control unit. In the calibration state, the signal acquisition device cuts off the control loop of the gas density relay contact signal and connects the gas density relay contact to the intelligent control unit;

[0105] 3) The intelligent control unit controls the air pressure regulating mechanism, which causes the pressure regulating bellows to expand and contract to adjust the gas pressure value. The intelligent control unit adjusts the gas pressure of the gas density relay by changing the pressure of the pressure regulating bellows of the air pressure regulating mechanism;

[0106] 4) When the pressure increases, the intelligent control unit controls the solenoid valve to close, thereby shutting off the gas path between the gas density relay and the electrical equipment; then, the gas pressure is slowly reduced, causing the gas density relay to generate an alarm and a lockout signal contact action. The contact action is transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the alarm and lockout signal contacts are actuated, or directly obtains the gas density value P20, detects the alarm and lockout contact signal action values ​​of the gas density relay, and completes the calibration of the contact signal action value of the gas density relay;

[0107] 5) The intelligent control unit drives the air pressure regulating mechanism to slowly increase the gas pressure, causing the gas density relay to alarm and reset the lockout signal contacts. The alarm and lockout signal contact resets are transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the contacts are reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return values ​​of the gas density relay, and completes the verification of the contact signal return value of the gas density relay;

[0108] 6) When all contact signal verification work is completed, the intelligent control unit controls the solenoid valve to open, so that the gas density relay and the gas circuit of the electrical equipment are interconnected, and the signal acquisition device is adjusted to the working state, and the control circuit of the contact signal of the gas density relay resumes normal working state.

[0109] In actual application operation, the sulfur hexafluoride gas density monitoring device performs data analysis based on the set calibration time and / or calibration instructions, the gas density value obtained based on the collected pressure value and temperature value, and the corresponding collected contact signal value; when the calibration time is reached or the calibration instruction is received, the signal acquisition device 6 is directly or indirectly adjusted to the calibration state through the intelligent control unit 7. Figure 4As shown, in the calibration state, signal acquisition device 6 disconnects the control circuit of the gas density relay contact signal. This means that the intelligent control unit 7 controls signal acquisition device 6, de-energizing the control coil of intermediate relay J1 of signal acquisition device 6. This disconnects contacts J11 and J12, disconnecting the gas density relay contact signal from the control circuit. Simultaneously, contact PJ of the gas density relay is connected to intelligent control unit 7. Intelligent control unit 7 then controls gas pressure regulating mechanism 5, which, through motor 503 driving push rod 502, causes pressure regulating bellows 501 to expand and contract, thereby adjusting the gas pressure. The intelligent control unit 7 adjusts the gas pressure of the gas density relay by controlling the pressure change of the pressure regulating bellows 501 of the gas pressure regulating mechanism 5; when the pressure increases, the intelligent control unit 7 controls the solenoid valve 4 to close, thereby shutting off the gas path between the gas density relay and the electrical equipment; then, the gas pressure is slowly reduced, causing the gas density relay to alarm and lock signal contacts to operate, and the contact operation is transmitted to the intelligent control unit 7 through the signal acquisition device 6. The intelligent control unit 7 obtains the gas density value P20 according to the pressure value P and temperature value T when the alarm and lock signal contacts operate, or directly obtains the gas density value P20, and detects whether the gas density relay The alarm and lockout contact signal action values ​​of the device are used to complete the verification of the contact signal action value of the gas density relay; next, the gas pressure is slowly increased by driving the air pressure regulating mechanism 5 through the intelligent control unit 7, so that the gas density relay generates an alarm and a lockout signal contact reset, and the alarm and lockout signal contact reset is transmitted to the intelligent control unit 7 through the signal acquisition device 6. The intelligent control unit 7 obtains the gas density value P20 according to the pressure value P and temperature value T at the time of contact reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return values ​​of the gas density relay, and completes the verification of the contact signal return value of the gas density relay. When all the contact signal verification work is completed, the intelligent control unit 7 controls the solenoid valve 4 to open, so that the gas density relay and the gas circuit of the electrical equipment are connected to each other, and the signal acquisition device 6 is adjusted to the working state. At this time, the signal acquisition device 6 is controlled by the intelligent control unit 7 to energize the control coil of the intermediate relay J1 of the signal acquisition device 6, and its contacts J11 and J12 are closed. In this way, the contact signal of the gas density relay is connected to the control circuit of the contact signal, and the control circuit of the contact signal of the gas density relay resumes normal working state.

[0110] In this embodiment, the intelligent control unit 7 controls the opening and closing of the solenoid valve 4 of the gas density monitoring device, ensuring that the gas density relay is connected to the electrical equipment in the gas path during operation. This ensures that the gas density relay can safely monitor the gas density of the electrical equipment, ensuring safe and reliable operation of the electrical equipment. In the calibration state, the gas density relay is disconnected from the electrical equipment in the gas path, and online calibration of the gas density relay does not affect the safe operation of the electrical equipment. This embodiment enables online calibration of the gas density relay, improving efficiency and reducing operation and maintenance costs. Furthermore, the entire calibration process achieves zero SF6 gas emissions, complying with environmental regulations and facilitating widespread application.

[0111] The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention uploads the density, temperature T, and / or pressure P of the gas in the insulating gas chamber 10 via data communication. For example, the device is connected to the substation's integrated automation online monitoring system via a data communication method such as RS-485, and the data is remotely transmitted to a central monitoring station at an unmanned station. Real-time monitoring is performed at both the local substation and remote central monitoring stations, enabling online monitoring of SF6 gas density in SF6 electrical equipment.

[0112] The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention can achieve long-distance transmission of test data and / or results and other information through data communication. It can also include a clock to record test time and can provide real-time online display of density, pressure, temperature, and other data, trend analysis, historical data query, and real-time alarms. When online monitoring detects an increasing trend in gas pressure, an abnormality notification can be promptly issued. The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention also includes a function to protect the ambient temperature of electronic components, preventing them from operating at excessively low or high temperatures and ensuring that they operate within the allowable temperature range. The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention can also be equipped with a heater and / or a heat sink (e.g., a fan), which is activated at low temperatures and the heat sink at high temperatures to ensure that electronic components such as the MEMS pressure sensor 2 and / or integrated circuit can operate reliably in low or high temperature environments. The vibration-resistant sulfur hexafluoride gas density monitoring device of the present invention can also include data analysis and data processing functions, enabling corresponding fault diagnosis and prediction for electrical equipment and the density relay itself.

[0113] Based on the above technical solution, the present invention provides a sulfur hexafluoride gas density monitoring device with anti-vibration characteristics. It is a highly vibration-resistant, high-precision, self-calibrating remote sulfur hexafluoride gas density monitoring device, which can improve monitoring efficiency, achieve maintenance-free operation, and thus reduce costs, making power grid operation more reliable. Its calibration method also has the above advantages.

[0114] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0115] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A vibration-resistant sulfur hexafluoride gas density monitoring device, comprising a housing, the housing being divided into a first chamber and a second chamber by a partition plate, wherein the device further comprises: include: A base is disposed in the first chamber, the base is connected to an inflation connector mounted on the outside of the shell, and an air passage is provided in the base; a pointer display mechanism, comprising a Baden tube and a pointer mechanism, wherein the Baden tube is connected to an air passage in the base; The stroke amplification mechanism includes a first bellows and a second bellows arranged in parallel, the lower end of the first bellows is fixed to the left side of the base, the lower end of the second bellows is fixed to the right side of the base, the first bellows is connected to the air passage in the base, and the second bellows is pre-filled with compensation gas; a guide cylinder is sleeved on the outer side of the first bellows and the second bellows, and the lower end of the guide cylinder is fixed to the base; a support rod is provided between the first bellows and the second bellows, the distance between the support rod and the first bellows is smaller than the distance between the support rod and the second bellows, the upper end of the support rod is hinged to a lever, the left end of the lever is hinged to a first connecting rod, the lower end of the first connecting rod is hinged to the upper end of the first bellows; the right end of the lever is hinged to the second connecting rod, and the lower end of the second connecting rod is hinged to the upper end of the second bellows; A micro switch comprises a drive rod, a guide plate, and a switch device. The upper end of the drive rod is connected to a crossbar, and a pressing column is connected to the crossbar. The pressing column is aligned with the switch device. The middle portion of the drive rod passes through a guide hole in the guide plate. The lower end of the drive rod is hinged to a lever. The drive rod is driven by the lever to cause the pressing column to press or release the switch device. The signal acquisition device includes a MEMS pressure sensor, which is communicatively connected to the intelligent control unit, which is communicatively connected to the host computer. The MEMS pressure sensor is connected to the partition plate, and the MEMS pressure sensor's air pressure acquisition port is connected to the airway in the base. The MEMS pressure sensor transmits the acquired signal to the intelligent control unit for processing.

2. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The signal acquisition device also includes a MEMS temperature sensor, which is connected to the partition plate. The air temperature acquisition end of the MEMS temperature sensor is located in the first chamber. The MEMS temperature sensor transmits the acquired signal to the intelligent control unit for processing.

3. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The micro switch is in communication connection with the intelligent control unit, and transmits a switch signal to the intelligent control unit.

4. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The intelligent control unit has a communication interface, and the communication interface is used to connect to a host computer, a storage device or a printing device.

5. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The upper end of the driving rod is provided with a threaded connector, the middle portion of the crossbar is provided with a threaded hole for connecting the threaded connector, the threaded connector is connected in the threaded hole, and a compression nut is also provided on the threaded connector.

6. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The cross bar is provided with a threaded hole for connecting the pressing column, and the pressing column is threadedly connected in the threaded hole.

7. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The lower end of the driving rod is hinged on the lever through a universal joint.

8. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The shell is a rectangular parallelepiped structure, and the inflation joint is sealed and connected to the shell.

9. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 1, characterized in that: The inflation connector is also connected to a multi-way connector, which has a first interface, a second interface and a third interface. The first interface is connected to the inflation connector, the second interface is connected to the insulating air chamber of the electrical equipment, and a solenoid valve is provided between the second interface and the insulating air chamber of the electrical equipment. The solenoid valve is communicatively connected to the intelligent control unit, and the intelligent control unit controls whether the solenoid valve is closed or connected; the third interface is connected to the air pressure regulating mechanism.

10. The vibration-resistant sulfur hexafluoride gas density monitoring device according to claim 9, characterized in that: The air pressure regulating mechanism includes a pressure regulating bellows, a push rod and a motor. The motor is communicatively connected to the intelligent control unit. The intelligent control unit controls the motor to drive the push rod to move and drive the pressure regulating bellows to extend and retract, thereby regulating the gas pressure in the base airway.

11. A method for calibrating a vibration-resistant sulfur hexafluoride gas density monitoring device, comprising the following steps: 1) Setting the calibration time of the sulfur hexafluoride gas density monitoring device or / issuing a calibration instruction; 2) When the calibration time is reached or a calibration instruction is received, the signal acquisition device is adjusted to the calibration state through the intelligent control unit. In the calibration state, the signal acquisition device cuts off the control loop of the gas density relay contact signal and connects the gas density relay contact to the intelligent control unit; 3) The intelligent control unit controls the air pressure regulating mechanism, which causes the pressure regulating bellows to expand and contract to adjust the gas pressure value. The intelligent control unit adjusts the gas pressure of the gas density relay by changing the pressure of the pressure regulating bellows of the air pressure regulating mechanism; 4) When the pressure increases, the intelligent control unit controls the solenoid valve to close, thereby shutting off the gas path between the gas density relay and the electrical equipment; then, the gas pressure is slowly reduced, causing the gas density relay to generate an alarm and a lockout signal contact action. The contact action is transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the alarm and lockout signal contacts are actuated, or directly obtains the gas density value P20, detects the alarm and lockout contact signal action values ​​of the gas density relay, and completes the calibration of the contact signal action value of the gas density relay; 5) The intelligent control unit drives the air pressure regulating mechanism to slowly increase the gas pressure, causing the gas density relay to alarm and reset the lockout signal contacts. The alarm and lockout signal contact resets are transmitted to the intelligent control unit through the signal acquisition device. The intelligent control unit obtains the gas density value P20 based on the pressure value P and temperature value T when the contacts are reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return values ​​of the gas density relay, and completes the verification of the contact signal return value of the gas density relay; 6) When all contact signal verification work is completed, the intelligent control unit controls the solenoid valve to open, so that the gas density relay and the gas circuit of the electrical equipment are interconnected, and the signal acquisition device is adjusted to the working state, and the control circuit of the contact signal of the gas density relay resumes normal working state.

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