CN213181916U

CN213181916U - Online checking and diagnosing device for gas density relay

Info

Publication number: CN213181916U
Application number: CN202021757326.6U
Authority: CN
Inventors: 杨美连
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2021-05-11
Anticipated expiration: 2030-08-20

Abstract

The application relates to an online checking and diagnosing device for a gas density relay, which relates to the technical field of electric power and comprises a detection mechanism for detecting gas density and a pressure adjusting mechanism for adjusting gas pressure, wherein the detection mechanism and the pressure adjusting mechanism are communicated; the pressure adjusting mechanism comprises a shell communicated with the detection mechanism, a corrugated pipe is arranged in the shell, one end, far away from the detection mechanism, of the corrugated pipe is fixedly connected to the inner side wall of the shell, and one end, close to the detection mechanism, of the corrugated pipe is arranged in a sealing mode through a plugging piece; one end of the corrugated pipe, which is far away from the detection mechanism, is also communicated with a pressure regulating assembly for realizing air pressure change. This application when the staff need detect gas density, only need through the atmospheric pressure in the pressure regulating subassembly control bellows, the atmospheric pressure in the bellows changes the back, is close to the atmospheric pressure that detection mechanism one side also can change in the casing to detect the casing and be close to the atmospheric pressure of detection mechanism one side, have the purpose that realizes detecting atmospheric pressure, raise the efficiency, reduce cost's effect.

Description

Online checking and diagnosing device for gas density relay

Technical Field

The application relates to the technical field of electric power, in particular to an online checking and diagnosing device for a gas density relay.

Background

At present, sulfur hexafluoride electrical products are widely applied to the power sector and industrial and mining enterprises, and rapid development of the power industry is promoted. In the power equipment in the power industry, the operation and normal work of high-voltage power equipment cannot be separated from sulfur hexafluoride gas medium used for arc extinction and insulation, so that in sulfur hexafluoride electric products provided with sealed sulfur hexafluoride gas chambers, the important basic requirement for ensuring that the gas chambers are not leaked is met, if the gas leaks, the reduction of gas density seriously affects the electrical performance of the equipment, and serious hidden danger is formed for the safe operation of the equipment. At present, a large number of gas density relays for monitoring whether sulfur hexafluoride in a gas chamber leaks are used, and ensuring the reliable and stable operation of the gas density relays becomes an important operation. The gas density relay on the power equipment is regularly checked, which is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the power equipment.

In the related art, the gas density relay is required to be periodically checked in the electric power preventive test procedure and the twenty-five key requirements for preventing the serious accidents of the electric power production. The inventors believe that verifying a gas density relay will be a significant amount of manpower and material.

SUMMERY OF THE UTILITY MODEL

In order to improve the efficiency and reduce the cost, the application provides an online checking and diagnosing device for a gas density relay.

The application provides a gas density relay online check diagnostic device adopts following technical scheme:

the gas density relay on-line checking and diagnosing device comprises a detection mechanism for detecting the gas density and a pressure adjusting mechanism for adjusting the gas pressure which are communicated;

the pressure adjusting mechanism comprises a shell communicated with the detection mechanism, a corrugated pipe is arranged in the shell, one end, far away from the detection mechanism, of the corrugated pipe is fixedly connected to the inner side wall of the shell, and one end, close to the detection mechanism, of the corrugated pipe is arranged in a sealing mode through a plugging piece;

one end of the corrugated pipe, which is far away from the detection mechanism, is also communicated with a pressure regulating assembly for realizing air pressure change.

Through adopting above-mentioned technical scheme, when the staff need detect gas density, only need through the atmospheric pressure in the pressure regulating subassembly control bellows, the atmospheric pressure in the bellows changes the back, is close to the atmospheric pressure that detection mechanism one side also can change in the casing to detect the casing and be close to the atmospheric pressure of detection mechanism one side, realize the purpose that detects atmospheric pressure, raise the efficiency, reduce cost.

Preferably, the pressure regulating assembly comprises a positive pressure air pump and a flow controller which are respectively communicated with the corrugated pipes, a first electromagnetic valve is further arranged between the flow controller and the corrugated pipes, and a second electromagnetic valve is further arranged between the positive pressure air pump and the corrugated pipes.

Through adopting above-mentioned technical scheme, positive pressure gas pump provides gas to in the bellows when the second solenoid valve switches on, realizes increasing the atmospheric pressure in the bellows, when needs reduce the atmospheric pressure in the bellows, closes the second solenoid valve, opens first solenoid valve simultaneously for the gas of bellows passes through flow controller discharge bellows, realizes reducing the atmospheric pressure in the bellows.

Preferably, one end of the shell, which is close to the pressure regulating assembly, is hermetically connected with a plugging plate, and the positive pressure air pump and the flow controller are both communicated with the plugging plate;

one end of the corrugated pipe, which is close to the pressure regulating assembly, is fixedly connected between the shell and the plugging plate through a corrugated pipe connecting plate.

Through adopting above-mentioned technical scheme, realize the sealed setting of bellows through shutoff board and bellows connecting plate, ensure the bellows at the in-process that atmospheric pressure detected, be difficult for the pressure release.

Preferably, a third connecting flange is arranged between the shell and the detection mechanism, and a third sealing element is arranged in the third connecting flange.

Through adopting above-mentioned technical scheme, third flange and third sealing member realize the sealing connection between casing and the detection mechanism.

Preferably, the detection mechanism comprises a multi-way joint, a density relay, a pressure sensor, a temperature sensor and a contact sampling and control processing unit;

the second end of the multi-way joint is communicated with the density relay, the fourth end of the multi-way joint is communicated with the third connecting flange, and the third end of the multi-way joint is communicated with the pressure sensor, the temperature sensor, the contact sampling unit and the control processing unit;

the control processing unit is in signal connection with the pressure sensor, the temperature sensor and the contact sampling, and the contact sampling signal is connected with the density relay;

the contact sampling signal is connected to the density relay and configured as a contact signal of the density relay.

Through adopting above-mentioned technical scheme, the circulation that leads to the joint realization gas that leads to more realizes, and the density relay, pressure sensor and the temperature sensor of being convenient for simultaneously detect atmospheric pressure.

Preferably, the first end of the multi-way joint is communicated with electrical equipment through a flow adjustable valve, and the flow adjustable valve is in signal connection with the control processing unit.

Through adopting above-mentioned technical scheme, when carrying out the atmospheric pressure and detect, disconnection flow adjustable valve and the disconnection of power equipment gas circuit are convenient for accurate detect atmospheric pressure.

Preferably, a first connecting flange is arranged between the power equipment and the flow adjustable valve, and a first sealing element is arranged in the first connecting flange;

and a second connecting flange is arranged between the flow adjustable valve and the multi-way joint, and a second sealing element is arranged in the second connecting flange.

Through adopting above-mentioned technical scheme, first flange and second flange make between electrical equipment, the adjustable valve of flow and the multi-ported connector sealing connection, and the leakproofness of connecting between electrical equipment, the adjustable valve of flow and the multi-ported connector is further strengthened to first sealing member and second sealing member.

Preferably, the positive pressure air pump, the second electromagnetic valve, the flow controller and the first electromagnetic valve are all controlled and connected to the control processing unit.

By adopting the technical scheme, the control processing unit controls the on-off of the positive pressure air pump and the flow controller through the electric signal, so that the air pressure in the corrugated pipe is automatically adjusted.

Preferably, one end of the density relay is in signal connection with a resistor R1, one end of the resistor R1, which is far away from the density relay, is in signal connection with a cathode of a light emitting diode LED in the optical coupler, an anode of the light emitting diode LED is in signal connection with a cathode of a diode D1, and an anode of the diode D1 is connected with a power supply terminal VCC;

an emitter of the triode VT in the optocoupler is connected with a resistor R2 in a signal mode, one end, far away from the triode VT, of the resistor R2 is grounded, a collector of the triode VT is connected with a resistor R3 in a signal mode, and one end, far away from the triode VT, of the resistor R3 is connected with a power supply end VCC in a signal mode.

Through adopting above-mentioned technical scheme, through the setting of opto-coupler for density relay reaches accurate steady voltage purpose, realizes signal reception and shifts.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the detection mechanism and the pressure adjusting mechanism, when a worker needs to detect the gas density, the pressure in the corrugated pipe is controlled only through the pressure adjusting assembly, and after the pressure in the corrugated pipe changes, the side, close to the detection mechanism, in the shell can also change, so that the pressure of the side, close to the detection mechanism, of the shell is detected, the purpose of detecting the pressure is achieved, the efficiency is improved, and the cost is reduced;

2. furthermore, the air pressure of the corrugated pipe can be adjusted by the remote control adjusting assembly through the arrangement of the control processing unit, so that the air pressure can be conveniently detected by a worker remotely;

3. further, through the setting of the adjustable valve of flow, when detecting atmospheric pressure, can with the disconnection of power equipment gas circuit, realize more accurate detection atmospheric pressure.

Drawings

Fig. 1 is a schematic diagram of a structure of an embodiment of the present application in normal operation.

Fig. 2 is a circuit schematic diagram of an embodiment of the present application.

Fig. 3 is a schematic structural diagram of the embodiment of the present application during step-down verification.

Description of reference numerals: 1. a detection mechanism; 11. a flow adjustable valve; 111. a first connecting flange; 1111. a first seal member; 12. a multi-way joint; 121. a second connecting flange; 1211. a second seal member; 122. a first connection port; 123. a second connection port; 124. a third connecting flange; 1241. a third seal member; 1242. a third connection port; 13. a pressure sensor; 14. a temperature sensor; 15. sampling a contact; 16. a control processing unit; 17. a density relay; 18. an electrical device; 2. a pressure adjusting mechanism; 21. a housing; 211. a cavity; 22. a bellows; 221. a blocking member; 222. a corrugated pipe connecting plate; 2221. a through hole; 223. a plugging plate; 23. a voltage regulating component; 231. a fourth connection port; 232. a fifth connection port; 233. a first solenoid valve; 234. a flow controller; 235. a second solenoid valve; 236. a positive pressure air pump.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a gas density relay on-line checking and diagnosing device. Referring to fig. 1, the online checking and diagnosing device for the gas density relay comprises a detection mechanism 1 for detecting the gas density and a pressure adjusting mechanism 2 for adjusting the gas pressure which are communicated.

The detection mechanism 1 comprises a flow adjustable valve 11, a multi-way joint 12, a pressure sensor 13, a temperature sensor 14, a contact point sample 15, a control processing unit 16 and a density relay 17.

One end of the flow adjustable valve 11 is communicated with the power equipment 18 through a first connecting flange 111, a first sealing element 1111 is arranged in the first connecting flange 111, and the first sealing element 1111 can be arranged as a rubber sealing ring; a second connecting flange 121 is arranged at one end of the flow adjustable valve 11 away from the first connecting flange 111, a second sealing element 1211 is arranged in the second connecting flange 121, and the second sealing element 1211 can be arranged as a rubber sealing ring; the flow adjustable valve 11 is configured to close or open the gas circuit of the electrical equipment 18, and the gas circuit of the electrical equipment 18 is closed.

The one end intercommunication in the first end of multi-way joint 12 that flow adjustable valve 11 is kept away from to second flange 121, and multi-way joint 12 is provided with four ports, and the second end intercommunication of multi-way joint 12 sets up to first connector 122, and first connector 122 communicates in density relay 17, and first connector 122 seals the setting.

The third end of the multi-way joint 12 is provided with a second connection port 123, the second connection port 123 is hermetically arranged, the second connection port 123 is communicated with the pressure sensor 13, the temperature sensor 14, the contact sample 15 and the control processing unit 16, and the pressure sensor 13, the temperature sensor 14 and the contact sample 15 are all in signal connection with the control processing unit 16.

Referring to fig. 1 and 2, one end of the contact sample 15 far away from the control processing unit 16 is in signal connection with the density relay 17 and the contact loop, and one end of the density relay 17 far away from the contact sample 15 is in signal connection with the contact loop and the ground; the end of the contact sample 15 close to the density relay 17 is further connected with a resistor R1 in a signal mode, one end of the resistor R1 far away from the density relay 17 is connected with the cathode of a Light Emitting Diode (LED) in the optical coupler in a signal mode, the anode of the LED is connected with the cathode of a diode D1 in a signal mode, and the anode of the diode D1 is connected with a power supply terminal VCC.

The emitter signal of triode VT in the opto-coupler is connected with resistor R2, and the one end ground that triode VT was kept away from to resistor R2, and the collector signal of triode VT has resistor R3, and the one end signal connection power end VCC that triode VT was kept away from to resistor R3.

The fourth end of the multi-way joint 12 is communicated with the pressure adjusting mechanism 2 through a third connecting flange 124, a third sealing element 1241 is arranged in the cavity 211 of the third connecting flange 124, the third sealing element 1241 can be a rubber sealing ring, and one end of the third connecting flange 124, which is close to the pressure adjusting mechanism 2, is set as a third connecting port 1242.

The pressure adjusting mechanism 2 comprises a shell 21 communicated with a third connecting port 1242, the shell 21 is in a cylindrical shape, a corrugated pipe 22 is arranged in the shell 21, one end, close to the detection mechanism 1, of the corrugated pipe 22 is hermetically arranged through a blocking piece 221, the blocking piece 221 can be arranged into a circular plate, the blocking piece 221 is not in contact with the shell 21, one end, close to the third connecting port 1242, of the corrugated pipe 22 forms a cavity 211, and the cavity 211 is communicated with the multi-way connector 12 on a gas path through the third connecting port 1242.

One end of the corrugated pipe 22, which is far away from the detection mechanism 1, is fixed at the end of the shell 21 through a corrugated pipe connecting plate 222, the corrugated pipe connecting plate 222 is arranged in a circular ring shape, a central hole of the corrugated pipe connecting plate 222 is provided with a through hole 2221, and the diameter of the through hole 2221 is equal to that of the corrugated pipe 22; one side of the corrugated pipe connecting plate 222, which is far away from the shell 21, is fixedly provided with a blocking plate 223, the corrugated pipe connecting plate 222 and the shell 21 form a sealed shell, and the sealed shell is communicated with a pressure regulating assembly 23 for realizing air pressure change.

Referring to fig. 1 and 3, the pressure regulating assembly 23 includes a fourth connection port 231 and a fifth connection port 232, which are opened on the blocking plate 223, and a first solenoid valve 233, a flow controller 234, a second solenoid valve 235, and a positive pressure gas pump 236; the interior of the bellows 22 is in gas-path communication with the second solenoid valve 235 through the fourth connection port 231, the positive pressure gas pump 236 is in gas-path communication with the bellows 22 through the second solenoid valve 235, and the second solenoid valve 235 is configured to open and close the gas path.

The flow controller 234 is in communication with the bellows 22 in an air path through the first solenoid valve 233 and the fifth connection port 232, and the first solenoid valve 233 is configured to open and close the air path.

The cavity 211 is communicated with the multi-way joint 12 and the density relay 17 on the gas path, and is mutually separated from the second electromagnetic valve 235 and the positive pressure gas pump 236 on the gas path through the corrugated pipe 22 to ensure sealing; meanwhile, the chamber 211 is isolated from the first solenoid valve 233 and the flow controller 234 by the bellows 22 and ensures sealing.

When the bellows 22 is filled with gas and pressurized by the positive pressure air pump 236 to gradually increase the air pressure, the bellows 22 expands and expands under the air pressure, and the volume increases while compressing the volume of the chamber 211; the volume of the cavity 211 is compressed by the corrugated pipe 22, the air pressure in the cavity 211 rises, and the pressure rise of the gas density relay 17 for online verification is realized; one end of the second electromagnetic valve 235 is communicated with the interior of the corrugated pipe 22 on the gas path through the fourth connecting port 231, and the flow controller 234 is communicated with the interior of the corrugated pipe 22 on the gas path through the first electromagnetic valve 233 and the fifth connecting port, so that the discharge and the flow control of gas in the corrugated pipe 22 are realized, and the purpose of controllable pressure reduction is achieved; when the gas in the bellows 22 is exhausted, the pressure is reduced, the volume of the bellows 22 is reduced, the volume of the cavity 211 is increased, the pressure is reduced, the pressure of the gas density relay 17 for on-line verification is reduced, and the gas density relay 17 for on-line verification generates contact signal action.

A pressure sensor 13 and a temperature sensor 14 which are arranged on the multi-way joint 12 are communicated on the gas path in a sealing way; the pressure sensor 13 collects real-time pressure signals of the pressure regulating mechanism 2 in the pressure increasing and reducing working processes and transmits the signals to the control processing unit 16; the temperature sensor 14 collects the corresponding temperature value and transmits the signal to the control processing unit 16.

The contact sampling device 15 is arranged at a proper position of the multi-pass connector 12, is connected with the gas density relay 17 for online verification, and is configured to sample a contact signal of the gas density relay 17 for online verification;

the control processing unit 16 is configured to control the closing or opening of the flow adjustable valve 11; the signals transmitted by the contact sample 15 and the pressure sensor 13, received through the connection cable, are configured to complete the control of the pressure regulating mechanism 2; and the control processing unit 16 is used for realizing pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detecting a contact signal action value and/or a contact signal return value of the gas density relay 17 subjected to online verification.

The control processing unit 16 is arranged at a proper position on the multi-way connector 12, is respectively connected with the contact point sampling 15, the pressure adjusting mechanism 2, the pressure sensor 13, the temperature sensor 14 and the density relay 17, and is configured to control the closing or opening of the flow adjustable valve 11; a contact sample 15, a pressure sensor 13 and a temperature sensor 14, received through a connection cable, configured to complete the control of the pressure adjustment mechanism 2;

and the control processing unit 16 is used for realizing pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detecting a contact signal action value and/or a contact signal return value of the gas density relay 17 subjected to online verification. When the contact signal action value and/or the contact signal return value of the gas density relay 17 obtained by online detection is abnormal, the control processing unit 16 sends an abnormal alarm signal.

The bellows 22 is a load-bearing elastic member having a plurality of laterally corrugated cylindrical thin-walled corrugated shells, and the bellows 22 has elasticity and is capable of being displaced by a pressure, an axial force, a lateral force or a bending moment to convert the pressure into a displacement or a force.

The bellows 22 is a metal bellows, and the bellows 22 is a single-layer or multi-layer bellows, and the material thereof is not limited to one or more of bronze, brass or stainless steel.

The positive pressure air pump 236 outputs positive pressure air pressure, which is not limited to one or more of a turbo pump, a screw pump, a plunger pump, a piston pump, a vane pump, and a diaphragm pump.

When the gas density relay 17 is checked and diagnosed on line, the flow adjustable valve 11 is closed, and the gas circuit of the power equipment 18 is disconnected. When the first electromagnetic valve 233 is closed, the positive pressure gas pump 236 inputs gas into the corrugated pipe 22 through the second electromagnetic valve 235, so that the gas pressure is increased, the volume is increased, the increase of the pressure in the cavity 211 is realized, and the purpose of increasing the pressure of the density relay 17 is achieved; when the second electromagnetic valve 235 is closed, the flow controller 234 controls the flow of the gas to be in a proper range through the opening of the first electromagnetic valve 233, and the gas is discharged controllably, slowly and stably, so that the gas pressure in the corrugated pipe 22 is slowly reduced, the volume is reduced, the gas pressure in the cavity 211 is reduced, and the purpose of reducing the pressure of the density relay 17 is achieved.

When the density relay 17 is verified, the control processing unit 16 closes the flow adjustable valve 11, disconnects the gas circuit of the power equipment 18, and controls the pressure adjusting mechanism 2 to perform pressure increasing and pressure reducing control on the density relay 17 through the control processing unit 16; in the voltage reduction process, the contact sampling 15 sends out corresponding pressure value contact signals, and the pressure value and the temperature value acquired by the pressure sensor 13 and the temperature sensor 14 are compared, so that the online checking and diagnosing performance of the density relay 17 can be realized.

The contact sample 15 is connected to the online verified gas density relay 17 and is configured to sample a contact signal of the online verified gas density relay 17.

The implementation principle of the online checking and diagnosing device for the gas density relay in the embodiment of the application is as follows: in a normal working state, the flow adjustable valve 11 of the online verification and diagnosis device is in an open state, the online verification and diagnosis device monitors a pressure value P and a temperature value T of gas in the power equipment 18 on line through the pressure sensor 13, the temperature sensor 14 and the control processing unit 16, and a microprocessor in the control processing unit 16 converts the pressure-temperature characteristic relation (which can be according to a state equation of corresponding gas) of the monitored gas into a gas density value P20, so that online real-time monitoring of the power equipment 18 including but not limited to the gas density value, the pressure value and the temperature value is realized; and the gas density relay 17 verified on-line monitors the gas density value in the power equipment 18. The control processing unit 16 monitors the gas pressure value P and the temperature value T of the power equipment 18 according to the pressure sensor 13 and the temperature sensor 14, and obtains a corresponding 20 ℃ pressure value P20 (i.e. a gas density value). When the gas density relay 17 needs to be checked, if the gas density value P20 of the power equipment 18 is more than or equal to the set safe check density value PS at this time; the control processing unit 16 or the background of the online verification diagnosis device sends out an instruction, namely the flow adjustable valve 11 is closed through the control processing unit 16, so that the online verification gas density relay 17 is isolated from the power equipment 18 on the gas path. Then, the control processing unit 16 disconnects the control loop of the online-check gas density relay 17, so that the safe operation of the power equipment 18 is not affected when the online-check diagnosis gas density relay 17 is performed, and an alarm signal is not mistakenly sent or the control loop is not locked when the online-check diagnosis gas density relay 17 is performed. Since the gas density relay 17 has already performed monitoring and judgment that the gas density value P20 of the power equipment 18 is not less than the set safe verification density value PS before the verification is started, the gas of the power equipment 18 is within the safe operation range, and moreover, the gas leakage is a slow process and is safe in the verification. Meanwhile, the control processing unit 16 is connected with the contact sampling 15 circuit of the gas density relay 17, then, the control processing unit 16 controls the first electromagnetic valve 233 of the pressure adjusting mechanism 2, and further adjusts the flow controller 234 of the pressure adjusting mechanism 2, so that the volume of the cavity composed of the bellows 22, the gas density relay 17, the flow adjustable valve 11, and the like is changed, the pressure of the gas density relay 17 is gradually reduced, so that the contact action of the density relay 17 is generated, the contact action is uploaded to the control processing unit 16 through the contact sampling 15, the control processing unit 16 converts the pressure value P and the temperature value T measured during the contact action into the pressure value P20 (density value) corresponding to 20 ℃ according to the gas characteristics, the contact action value PD20 of the gas density relay 17 can be detected, after all the contact action values of the alarm and/or locking signal of the gas density relay 17 are detected, and then the control processing unit 16 controls the positive pressure air pump 236 of the pressure adjusting mechanism 2 to adjust the bellows 22 of the pressure adjusting mechanism 2, so that the air pressure of the air density relay 17 is gradually increased, and the return value of the alarm and/or locking contact signal of the air density relay 17 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay 17 is completed. Then, the control processing unit 16 opens the circuit of the contact point sampling 15 of the gas density relay 17, and the contact point of the gas density relay 17 is disconnected from the control processing unit 16. Meanwhile, the flow adjustable valve 11 is opened through the control processing unit 16, so that the gas density relay 17 is communicated with the power equipment 18 on a gas path, sealing is ensured, and sealing performance is improved. The control processing unit 16 is communicated with a control loop of the gas density relay 17, a density monitoring loop of the gas density relay 17 restores to normal operation, and the gas density relay 17 monitors the gas density of the power equipment 18 safely, so that the power equipment 18 works safely and reliably. Therefore, the online checking and diagnosing work of the gas density relay 17 can be conveniently completed, and the safe operation of the power equipment 18 cannot be influenced when the gas density relay 17 is checked and diagnosed online.

After the gas density relay 17 is checked, the on-line check diagnosis device makes a judgment and can notify the detection result. The mode is flexible, and particularly can be as follows: 1) the online verification diagnosis device can be informed locally, for example, through an indicator light, a digital code or a liquid crystal display; 2) or uploading can be implemented through an online remote transmission communication mode, for example, uploading to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals.

According to the method and the device, the gas density relay 17 can be checked without a maintainer going to the site, so that the reliability of a power grid is greatly improved, the efficiency is improved, and the cost is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The on-line checking and diagnosing device for the gas density relay is characterized in that: comprises a detection mechanism (1) for detecting the density of the gas and a pressure adjusting mechanism (2) for adjusting the pressure of the gas which are communicated;

the pressure adjusting mechanism (2) comprises a shell (21) communicated with the detection mechanism (1), a corrugated pipe (22) is arranged in the shell (21), one end, far away from the detection mechanism (1), of the corrugated pipe (22) is fixedly connected to the inner side wall of the shell (21), and one end, close to the detection mechanism (1), of the corrugated pipe (22) is hermetically arranged through a plugging piece (221);

one end of the corrugated pipe (22) far away from the detection mechanism (1) is also communicated with a pressure regulating assembly (23) for realizing air pressure change.

2. An online verification and diagnosis device for a gas density relay (17) according to claim 1, characterized in that: pressure regulating subassembly (23) are including communicating respectively positive pressure gas pump (236) and flow controller (234) of bellows (22), flow controller (234) with still be provided with first solenoid valve (233) between bellows (22), positive pressure gas pump (236) with still be provided with second solenoid valve (235) between bellows (22).

3. The on-line verification and diagnosis device for the gas density relay as claimed in claim 2, wherein: one end of the shell (21) close to the pressure regulating assembly (23) is hermetically connected with a blocking plate (223), and the positive pressure air pump (236) and the flow controller (234) are both communicated with the blocking plate (223);

one end of the corrugated pipe (22) close to the pressure regulating assembly (23) is fixedly connected between the shell (21) and the blocking plate (223) through a corrugated pipe connecting plate (222).

4. The on-line verification and diagnosis device for the gas density relay as claimed in claim 3, wherein: a third connecting flange (124) is arranged between the shell (21) and the detection mechanism (1), and a third sealing piece (1241) is arranged in the third connecting flange (124).

5. The on-line verification and diagnosis device for the gas density relay as claimed in claim 4, wherein: the detection mechanism (1) comprises a multi-way joint (12), a density relay (17), a pressure sensor (13), a temperature sensor (14), a contact sampling unit (15) and a control processing unit (16);

the second end of the multi-way joint (12) is communicated with the density relay (17), the fourth end of the multi-way joint (12) is communicated with the third connecting flange (124), and the third end of the multi-way joint (12) is communicated with the pressure sensor (13), the temperature sensor (14), the contact sampling (15) and the control processing unit (16);

the control processing unit (16) is in signal connection with the pressure sensor (13), the temperature sensor (14) and the contact sample (15), and the contact sample (15) is in signal connection with the density relay (17);

the contact sampling (15) is connected with the density relay (17) in a signal mode and configured to be a contact signal of the density relay (17).

6. The on-line verification and diagnosis device for the gas density relay as claimed in claim 5, wherein: the first end of the multi-way joint (12) is communicated with an electric device (18) through a flow adjustable valve (11), and the flow adjustable valve (11) is in signal connection with the control processing unit (16).

7. The on-line verification and diagnosis device for the gas density relay as claimed in claim 6, wherein: a first connecting flange (111) is arranged between the power equipment (18) and the flow adjustable valve (11), and a first sealing member (1111) is arranged in the first connecting flange (111);

a second connecting flange (121) is arranged between the flow adjustable valve (11) and the multi-way joint (12), and a second sealing element (1211) is arranged in the second connecting flange (121).

8. The on-line verification and diagnosis device for the gas density relay as claimed in claim 5, wherein: the positive pressure air pump (236), the second electromagnetic valve (235), the flow controller (234) and the first electromagnetic valve (233) are all connected to the control processing unit (16) in a controlled manner.

9. The on-line verification and diagnosis device for the gas density relay as claimed in claim 5, wherein: one end of the density relay (17) is in signal connection with a resistor R1, one end of the resistor R1, which is far away from the density relay (17), is in signal connection with the cathode of a light-emitting diode (LED) in the optical coupler, the anode of the LED is in signal connection with the cathode of a diode D1, and the anode of the diode D1 is connected with a power supply terminal VCC;