CN114323617A - Novel gas relay oil-shortage mechanical checking device and checking method - Google Patents
Novel gas relay oil-shortage mechanical checking device and checking method Download PDFInfo
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- CN114323617A CN114323617A CN202111642636.2A CN202111642636A CN114323617A CN 114323617 A CN114323617 A CN 114323617A CN 202111642636 A CN202111642636 A CN 202111642636A CN 114323617 A CN114323617 A CN 114323617A
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Abstract
The invention relates to a novel gas relay oil-lack mechanical type calibration device and a calibration method, wherein the calibration device comprises an oil storage unit, a signal indication unit and a calibration unit, the oil storage unit is connected with one end of a gas relay, the calibration unit is connected with the other end of the gas relay, and the signal indication unit is connected with the gas relay; the oil storage unit comprises an oil storage tank and a buffer oil tank, the oil storage tank is connected with the buffer oil tank, and the buffer oil tank is connected with the gas relay and used for providing oil for checking; the signal indicating unit is used for indicating a checking result; the checking unit comprises a checking pipeline, a moving piston and a driving mechanism, the checking pipeline is communicated with the gas relay, the moving piston is arranged in the checking pipeline in a sliding mode, and the driving mechanism is connected with the moving piston and used for driving the moving piston to move in the checking pipeline. The invention detects and verifies the heavy gas signal and the light gas signal of the gas relay in a mechanical mode, can complete verification by adopting a small amount of transformer oil, and is energy-saving, environment-friendly, stable and reliable.
Description
Technical Field
The invention relates to the technical field of calibration equipment, in particular to a novel gas relay oil-lack mechanical calibration device and a calibration method.
Background
The gas relay is the most widely used non-electric quantity protection component in the power system, when the transformer breaks down, the gas relay can send out an alarm signal, when the fault is further enlarged and becomes serious, the gas relay can send out a trip signal to separate the transformer from the power system, and the larger loss is prevented from being caused. The gas relay determines the operation safety of the whole transformer according to the quality of the gas relay, so that the gas relay is an indispensable verification project in the power industry. Traditional progressive check-up belongs to and lasts and adds the sign indicating number, lasts the state that promotes, and buchholz relay actual working condition often is abrupt action in the twinkling of an eye, and traditional buchholz relay check-up has a great deal of drawback: 1. the working condition state of the actual action cannot be truly reflected by adopting progressive verification; 2. the detection precision is not high by adopting air pump air source type simulation verification; 3. the traditional equipment is provided with a large-scale motor oil pump or air pump, so that the energy consumption is large; 4. a large amount of transformer oil is needed, the oil pollution is serious, the post-treatment of the transformer oil is complicated, and the cost is high; 5. the accuracy of the electronic flowmeter is limited, and the accuracy of the traditional calibration stand is lower.
Disclosure of Invention
The invention aims to provide a novel gas relay oil-lack mechanical type checking device, which is used for solving the problems of the traditional gas checking device and also provides a checking method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel mechanical type gas relay oil-shortage calibration device comprises an oil storage unit, a signal indication unit and a calibration unit, wherein the oil storage unit is connected with one end of a gas relay, the calibration unit is connected with the other end of the gas relay, and the signal indication unit is connected with the gas relay; the oil storage unit comprises an oil storage tank and a buffer oil tank, the oil storage tank is connected with the buffer oil tank, and the buffer oil tank is connected with the gas relay and used for providing oil for checking; the signal indicating unit is used for indicating a checking result; the checking unit comprises a checking pipeline, a moving piston and a driving mechanism, the checking pipeline is communicated with the gas relay, the moving piston is arranged in the checking pipeline in a sliding mode, and the driving mechanism is connected with the moving piston and used for driving the moving piston to move in the checking pipeline.
Preferably, the driving mechanism comprises a spring force storage mechanism and a triggering mechanism, the spring force storage mechanism comprises a spring, an expansion link, a ratchet wheel and a crank, one end of the expansion link is connected with the moving piston, a plurality of meshing parts are arranged on the expansion link along the length direction, the ratchet wheel is meshed with the meshing parts, and the crank is in transmission connection with the ratchet wheel and used for driving the ratchet wheel to rotate; the trigger mechanism comprises a trigger handle, the trigger handle is used for being clamped with or separated from the meshing part, and the trigger handle triggers the spring force accumulation mechanism to act after being separated from the meshing part.
Preferably, the trigger handle is hinged to the housing, and the trigger handle includes a trigger handle body and a trigger spring, wherein the trigger handle body is hinged to the housing, one end of the trigger spring is fixed to the housing, the other end of the trigger spring is fixed to the upper end of the trigger handle body, and the trigger spring is used for providing pressing force between the trigger handle body and the engagement portion.
Preferably, the telescopic rod is provided with a plurality of protruding blocks extending outwards in the circumferential direction, the protruding blocks are arranged in a row along the length direction of the telescopic rod, and the engaging part is formed between every two adjacent protruding blocks.
Further preferably, a calibration unit is arranged on the calibration pipeline and comprises flow rate calibration and volume calibration, and a calibration indication mark is arranged on the moving piston.
Further preferably, the oil storage tank is connected with the buffer oil tank through an oil inlet pipeline, an oil pump is arranged in the oil inlet pipeline, and the oil pump is used for pumping the transformer oil in the oil storage tank into the buffer oil tank.
Preferably, the buffer oil tank is internally provided with a buffer air bag, the buffer air bag is connected with a sealing valve, the sealing valve is communicated with the atmosphere, the buffer oil tank is provided with a pressure gauge, and the oil inlet pipeline is internally provided with an oil feeding valve for controlling the on-off of the oil inlet pipeline.
Further preferably, the oil storage tank further comprises an oil return groove, the oil return groove is formed below the gas relay, and the oil return groove is connected with the oil storage tank through an oil return pipe.
Preferably, the buffer oil tank is connected with the gas relay through a test pipeline, one end of the test pipeline is communicated with the lower part of the buffer oil tank, and the other end of the test pipeline is communicated with the gas relay.
A verification method comprises the following steps of,
1) when the pointer indication mark indicates a corresponding flow rate scale, the trigger mechanism is started to instantly release the spring force accumulation mechanism to push the moving piston to move towards the relay direction, so that a stable quantitative oil mass is formed to impact a baffle of the gas relay, and a signal indication of the signal indication unit is observed to perform heavy gas test;
2) under the full oil state of the test pipeline and the gas relay, the moving piston moves towards the direction far away from the gas relay by operating the spring force storage mechanism, so that the oil level in the gas relay is lowered, the light gas floater is lowered, light gas action is caused, the signal indication of the signal indication unit is observed, and light gas test is carried out;
3) under the state that the test pipeline and the gas relay are full of oil, the sealing valve and the oil feeding valve are closed, the moving piston slowly moves towards the direction of the gas relay by operating the spring force storage mechanism, so that the pressure in the gas relay rises, pressure maintaining timing is started after the pressure gauge is observed to reach a pressure value, and sealing performance test is carried out;
4) the transformer oil in the gas relay is discharged into the oil return tank to cause the lower float of the gas relay to act,
and (5) testing the low liquid level alarm function of the gas relay.
The invention has the beneficial effects that:
the invention relates to a novel mechanical checking device for a gas relay with less oil, wherein a checking pipeline is communicated with a gas relay, a moving piston is arranged in the checking pipeline, the driving mechanism drives the moving piston to move towards the gas relay, stable oil flow is generated to impact a heavy gas baffle plate of the gas relay, heavy gas action is simulated, and the aim of testing heavy gas is achieved, the driving mechanism drives the moving piston to move towards the direction far away from the gas relay, so that the liquid level of transformer oil in the gas relay is reduced, a light gas floater sinks, and light gas action is caused, and the aim of testing light gas is achieved. Only need below transformer oil 16L, for traditional calibration equipment 160L, save transformer oil 90%, be favorable to extensive popularization.
Furthermore, the driving mechanism adopts an adjustable spring to accumulate force to trigger release, pushes the moving piston to enable oil flow to stably and controllably impact the heavy gas baffle of the gas relay to check heavy gas, simulates the burst state of the transformer during fault, adopts purely mechanical manual operation, effectively avoids the influences of attenuation of electronic elements, voltage fluctuation, electrostatic potential aggregation, poor grounding, electromagnetic interference and the like, is reliable and stable, has good repeatability, and can continuously work in a complex electromagnetic environment.
Drawings
FIG. 1 is a schematic diagram of the novel gas relay oil-lack mechanical checking device of the invention;
FIG. 2 is a schematic view at A in FIG. 1;
FIG. 3 is a schematic view showing a normal sealing state of the buchholz relay;
FIG. 4 is a schematic view of a gas relay in a light gas state;
FIG. 5 is a schematic diagram of a heavy gas state of the gas relay;
fig. 6 is a schematic view showing a state where the transformer oil of the buchholz relay is lost.
Names corresponding to the marks in the figure:
11. the device comprises an oil storage tank, 12, a buffer oil tank, 13, an oil inlet pipeline, 14, an oil feeding pump, 15, a buffer air bag, 16, a sealing valve, 17, a pressure gauge, 18, an oil feeding valve, 19, a test pipeline, 2, a signal indicating unit, 31, a checking pipeline, 32, a moving piston, 331, a force storage spring, 332, a telescopic rod, 3321, a lug, 333, a ratchet wheel, 334, a crank, 341, a trigger handle body, 342, a trigger spring, 35, a shell, 36, a flow rate scale, 37, a volume scale, 38, a scale indicating mark, 4, a gas relay, 41, a light gas floater, 42, a baffle, 5, transformer oil, 6, an oil return groove, 7, an oil return pipe, 8 and a support.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
the novel gas relay oil-lack mechanical checking device in the embodiment of the invention detects and checks a heavy gas signal, a light gas signal, sealing performance and an oil loss fault signal of a gas relay in a mechanical test mode, can complete checking by adopting a small amount of transformer oil, is energy-saving, environment-friendly, stable and reliable, and replaces the traditional gas relay checking equipment.
As shown in fig. 1, the novel mechanical type checking device for the gas relay oil shortage comprises an oil storage unit, a signal indication unit 2 and a checking unit, wherein the oil storage unit, the signal indication unit 2 and the checking unit are all arranged on a support 8, the oil storage unit is connected with one end of a gas relay 4, the checking device is connected with the other end of the gas relay 4, and the signal indication unit 2 is connected with the gas relay 4. The oil storage unit is used for providing the transformer oil 5, in the embodiment, the transformer oil amount is 16L, and compared with the requirement of 160L of transformer oil of the conventional verification device, a large amount of transformer oil 5 can be saved. The checking unit is used for checking the gas relay 4, and the signal indicating unit 2 is used for displaying a corresponding signal after the gas relay 4 generates a corresponding action.
When the gas relay 4 is actually used, one end of the gas relay is connected with an oil tank of a transformer, the other end of the gas relay is connected with an oil storage cabinet, the gas relay 4 is in different states as shown in figures 3-6, the protection of the gas relay 4 is divided into light gas and heavy gas, the light gas is mainly reflected in that gas decomposed by oil rises into the gas relay 4 when the gas relay is in operation or in slight fault, the oil level is reduced due to the gas pressure, a light gas floater 41 of the gas relay 4 descends, and a light gas dry spring contact is connected to send a signal. The heavy gas mainly reflects the serious internal faults of the transformer, particularly the faults that other transformers cannot act quickly, such as turn-to-turn short circuit and the like, the generated strong gas pushes oil flow to impact the baffle 42, and the magnet on the baffle 42 attracts the contact of the heavy gas reed pipe to make the contact connected and send a signal. This embodiment is through the cooperation of oil storage unit, signal indication unit 2 and check-up unit promptly, simulates the action of the light gas of gas relay 4 and heavy gas, comes to check-up gas relay 4, and wherein, check-up unit is connected with 4 one end of gas relay, simulates the oil tank of transformer, and the oil storage unit is connected with 4 other ends of gas relay, simulates the oil conservator.
As shown in fig. 1, the oil storage unit includes an oil storage tank 11 and a buffer oil tank 12, the oil storage tank 11 is connected to the buffer oil tank 12 through an oil inlet pipe 13, the buffer oil tank 12 is connected to the buchholz relay 4 through a test pipe 19, and the test pipe 19 is disposed at a lower portion of the buffer oil tank 12. An upper oil pump 14 is arranged on the oil inlet pipeline 13 and is used for pumping the transformer oil 5 in the oil storage tank 11 into the buffer oil tank 12.
In order to improve the calibration accuracy and truly simulate the structure of the transformer, a buffer air bag 15 is further arranged in the buffer oil tank 12, a sealing valve 16 is connected to the buffer air bag 15, the sealing valve 16 is communicated with the atmosphere, and the buffer air bag 15 can keep the interior of the buffer oil tank 12 in a micro-pressure state and prevent the transformer oil 5 from contacting with the air.
The buffer oil tank 12 is also provided with a pressure gauge 17 for indicating the pressure value of the buffer oil tank 12, and the oil inlet pipeline 13 is provided with an oil feeding valve 18 for controlling the on-off of the oil inlet pipeline 13.
As shown in fig. 1, the verification unit includes a verification conduit 31, a moving piston 32 and a driving mechanism, the verification conduit 31 is communicated with the buchholz relay 4, the moving piston 32 is slidably disposed in the verification conduit 31, and the driving mechanism is connected with the moving piston 32 and is used for driving the moving piston 32 to move in the verification conduit 31.
In this embodiment, the checking pipe 31 is made of a transparent material, the inner wall is smooth and seamless, the moving piston 32 can slide back and forth in the checking pipe 31, and in the moving process of the moving piston 32, the transformer oil 5 in the checking pipe 31, the gas relay 4 and the testing pipe 19 can be sucked or pressurized, so that the change of the transformer can be simulated.
Specifically, the driving mechanism comprises a spring force accumulation mechanism and a triggering mechanism, the spring force accumulation mechanism is used for extruding the moving piston 32, the triggering mechanism is used for triggering the spring force accumulation mechanism to act, the spring force accumulation mechanism generates instant thrust to push the moving piston 32 to act, the moving piston 32 drives the transformer oil 5 to impact the gas relay 4, and the scene of heavy gas action during serious faults of the transformer is simulated.
As shown in fig. 2, the spring power storage mechanism comprises a power storage spring 331, a telescopic rod 332, a ratchet 333 and a crank 334, one end of the telescopic rod 332 is connected with the moving piston 32, a plurality of convex blocks 3321 extend outwards on the circumference of the telescopic rod 332, each convex block 3321 is arranged along the length direction of the telescopic rod 332, a meshing part is formed between two adjacent convex blocks 3321, the ratchet 333 is meshed with the meshing part, the crank 334 is in transmission connection with the ratchet 333,
when the crank 334 rotates, the ratchet 333 rotates, and the telescopic rod 332 is driven to move in a direction away from the buchholz relay 4, thereby compressing the power storage spring 331.
The trigger mechanism comprises a trigger handle hinged on the housing 35, in this embodiment, the ratchet 333 and the crank 334 are also arranged on the housing 35, the trigger handle comprises a trigger handle body 341 and a trigger spring 342, wherein the trigger handle body 341 is hinged on the housing 35, one end of the trigger spring 342 is fixed on the housing 35, the other end is fixed on the upper end of the trigger handle body 341, the upper end of the trigger handle body 341 is provided with a clamping tooth clamped in the meshing part, the trigger spring 342 provides a pressing force for clamping the trigger handle body 341 in the meshing part, and simultaneously, the lower end of the trigger handle body 341 is pulled, so that the trigger handle body 341 can be separated from the clamping with the meshing part, and the moving piston 32 can be popped out instantly.
As shown in fig. 1, a calibration unit is provided on the calibration pipe 31, the calibration unit includes a flow rate calibration 36 and a volume calibration 37 for performing the calibration of the light gas and heavy gas actions, and a calibration indication mark 38 is provided on the movable piston 32 for indicating the flow rate value and the volume value.
The signal indicating unit 2 is connected with the gas relay 4 and used for generating corresponding indicating signals when light gas or heavy gas acts, and in the embodiment, an indicating lamp is used as the indicating signals.
An oil return groove 6 is arranged below the gas relay 4, the oil return groove 6 is communicated with an oil storage tank 11 through an oil return pipe 7, and the transformer oil 5 in the gas relay 4 flows into the oil return groove 6 after being discharged and then flows back to the oil storage tank 11 through the oil return pipe 7.
The gas relay calibration method adopting the novel gas relay oil-lacking mechanical calibration device comprises the following steps:
1) starting an oil feeding pump 14, pumping the transformer oil 5 in an oil storage tank 11 into a buffer oil tank 12, then rotating a crank 334, pulling a power storage spring 331 to drive a moving piston 32 to move towards a direction away from a gas relay 4, so that the transformer oil 5 is filled in a test pipeline 19 and the gas relay 4, meanwhile, a scale indication mark 38 indicates a corresponding flow rate scale 36, recording a numerical value indicated by the scale indication mark 38, then starting a trigger mechanism, enabling the power storage spring 331 to release instantly, pushing the moving piston 32 to form stable quantitative oil flow to impact a baffle 42 of the gas relay 4, and enabling an action signal indicator lamp of the baffle 42 to be on, so that the purpose of testing heavy gas is achieved;
2) when the gas relay 4 and the test pipeline 19 are in a full oil state, the crank 334 is rotated, the power storage spring 331 is pulled to drive the moving piston 32 to slowly move towards the direction away from the gas relay 4, the oil level of the part, higher than the diameter part of the test pipeline 19, of the gas relay 4 descends, so that the light gas floater 41 sinks to cause light gas action, a light gas signal lamp is lightened, the volume scale 37 at the moment is recorded, and the purpose of testing light gas is achieved;
3) under the state that the gas relay 4 and the test pipeline 19 are filled with oil, the sealing valve 16 and the oil adding valve 18 are closed to enable the equipment to be in a sealing state, the crank 334 is rotated to push the moving piston 32 to move towards the gas relay 4, so that the pressure in the gas relay 4 rises, the pressure gauge 17 is observed, pressure maintaining timing is started after a certain pressure value is reached, and whether the pressure gauge 17 descends or not is checked after the time is up, so that the purpose of a sealing test is achieved;
4) and (3) discharging oil in the test pipeline 19 and the buffer oil tank 12 into an oil return tank, so that a lower float of the gas relay 4 acts, and a signal indicator lamp is lightened, thereby realizing the test of the low liquid level alarm function of the gas relay 4.
Compared with the traditional progressive calibration which cannot truly reflect the working state of the gas relay, the progressive calibration belongs to a continuous code adding and pushing state, the actual working state of the gas relay is often instantaneous and sudden, the novel gas relay oil shortage mechanical calibration device adopts pressure increment extrusion oil flow test, the sudden change state of a transformer during fault is simulated in a panoramic mode, and the test result is more in line with the actual working real condition.
Example 2:
different from embodiment 1, this embodiment adopts a plurality of electron devices, has realized automatic test, and crank 334 is changed for servo motor, and servo motor drive ratchet 333 rotates, and trigger mechanism is changed for electromagnetic lock by trigger handle, and signal indication unit 2 is changed for signal collector by the pilot lamp, and manometer 17 is changed for pressure sensor, and the pointer instruction changes the slider resistance signal into, wholly is controlled by the host computer, accomplishes automatic check. The servo motor, the electromagnetic lock, the signal collector, the pressure sensor and the slide block resistor are all in the prior art.
Claims (10)
1. The utility model provides a novel few oily mechanical type calibration of buchholz relay device which characterized in that: the gas relay comprises an oil storage unit, a signal indicating unit and a checking unit, wherein the oil storage unit is connected with one end of the gas relay, the checking unit is connected with the other end of the gas relay, and the signal indicating unit is connected with the gas relay; the oil storage unit comprises an oil storage tank and a buffer oil tank, the oil storage tank is connected with the buffer oil tank, and the buffer oil tank is connected with the gas relay and used for providing oil for checking; the signal indicating unit is used for indicating a checking result; the checking unit comprises a checking pipeline, a moving piston and a driving mechanism, the checking pipeline is communicated with the gas relay, the moving piston is arranged in the checking pipeline in a sliding mode, and the driving mechanism is connected with the moving piston and used for driving the moving piston to move in the checking pipeline.
2. The novel mechanical type checking device for the gas relay oil shortage according to claim 1, is characterized in that: the driving mechanism comprises a spring force storage mechanism and a triggering mechanism, the spring force storage mechanism comprises a spring, a telescopic rod, a ratchet wheel and a crank, one end of the telescopic rod is connected with the moving piston, a plurality of meshing parts are arranged on the telescopic rod along the length direction, the ratchet wheel is meshed with the meshing parts, and the crank is in transmission connection with the ratchet wheel and used for driving the ratchet wheel to rotate; the trigger mechanism comprises a trigger handle, the trigger handle is used for being clamped with or separated from the meshing part, and the trigger handle triggers the spring force accumulation mechanism to act after being separated from the meshing part.
3. The novel mechanical type checking device for the gas relay oil shortage according to claim 2, is characterized in that: the trigger handle is hinged to the shell and comprises a trigger handle body and a trigger spring, wherein the trigger handle body is hinged to the shell, one end of the trigger spring is fixed to the shell, the other end of the trigger spring is fixed to the upper end of the trigger handle body, and the trigger spring is used for providing pressing force of the trigger handle body and the meshing portion.
4. The novel mechanical type checking device for the gas relay oil shortage according to claim 3, is characterized in that: the telescopic link goes up circumference and outwards extends and has a plurality of lugs, and each lug is followed telescopic link length direction arranges the setting, forms between two adjacent lugs meshing portion.
5. The novel mechanical type checking device for the gas relay oil shortage according to claim 1, is characterized in that: the calibration pipeline is provided with a scale unit, the scale unit comprises flow rate scales and volume scales, and the moving piston is provided with scale indication marks.
6. The novel mechanical type checking device for the gas relay oil shortage according to claim 1, is characterized in that: the oil storage tank is connected with the buffer oil tank through an oil inlet pipeline, an oil pump is arranged in the oil inlet pipeline, and the oil pump is used for pumping transformer oil in the oil storage tank into the buffer oil tank.
7. The novel mechanical type checking device for the gas relay oil shortage according to claim 6, is characterized in that: the buffer oil tank is internally provided with a buffer air bag, the buffer air bag is connected with a sealing valve, the sealing valve is communicated with the atmosphere, the buffer oil tank is provided with a pressure gauge, and the oil inlet pipeline is internally provided with an oil feeding valve for controlling the on-off of the oil inlet pipeline.
8. The novel mechanical type checking device for the gas relay oil shortage according to claim 1, is characterized in that: the oil return groove is formed below the gas relay and is connected with the oil storage tank through an oil return pipe.
9. The novel mechanical type checking device for the gas relay oil shortage according to claim 1, is characterized in that: the buffer oil tank is connected with the gas relay through a test pipeline, one end of the test pipeline is communicated with the lower portion of the buffer oil tank, and the other end of the test pipeline is communicated with the gas relay.
10. The checking method using the novel mechanical checking device for the oil shortage of the buchholz relay as claimed in any one of claims 1 to 9, characterized in that: comprises the following steps of (a) carrying out,
1) enabling a certain amount of transformer oil to be contained in the buffer oil tank, enabling the moving piston to move towards the direction far away from the gas relay by operating the spring force accumulation mechanism, enabling the gas relay and the test pipeline to be filled with the transformer oil, starting the trigger mechanism when the pointer indication mark indicates the corresponding flow rate scale, enabling the spring force accumulation mechanism to be released instantly, pushing the moving piston to move towards the relay, forming stable quantitative oil flow to impact a baffle plate of the gas relay, observing signal indication of the signal indication unit, and carrying out heavy gas test;
2) under the full oil state of the test pipeline and the gas relay, the moving piston moves towards the direction far away from the gas relay by operating the spring force storage mechanism, so that the oil level in the gas relay is lowered, the light gas floater is lowered, light gas action is caused, the signal indication of the signal indication unit is observed, and light gas test is carried out;
3) under the state that the test pipeline and the gas relay are full of oil, the sealing valve and the oil feeding valve are closed, the moving piston slowly moves towards the direction of the gas relay by operating the spring force storage mechanism, so that the pressure in the gas relay rises, pressure maintaining timing is started after the pressure gauge is observed to reach a pressure value, and sealing performance test is carried out;
4) and discharging the transformer oil in the gas relay into the oil return tank to cause the action of a lower floater of the gas relay, and testing the low liquid level alarm function of the gas relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111642636.2A CN114323617A (en) | 2021-12-29 | 2021-12-29 | Novel gas relay oil-shortage mechanical checking device and checking method |
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| CN202111642636.2A CN114323617A (en) | 2021-12-29 | 2021-12-29 | Novel gas relay oil-shortage mechanical checking device and checking method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118017437A (en) * | 2024-04-08 | 2024-05-10 | 常熟市安得电力机具制造有限公司 | Emergency protection circuit device for transformer substation detection and protection method thereof |
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2021
- 2021-12-29 CN CN202111642636.2A patent/CN114323617A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118017437A (en) * | 2024-04-08 | 2024-05-10 | 常熟市安得电力机具制造有限公司 | Emergency protection circuit device for transformer substation detection and protection method thereof |
| CN118017437B (en) * | 2024-04-08 | 2024-06-04 | 常熟市安得电力机具制造有限公司 | Emergency protection circuit device for transformer substation detection and protection method thereof |
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