CN114397570A - Gas relay calibration device - Google Patents
Gas relay calibration device Download PDFInfo
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- CN114397570A CN114397570A CN202210080511.3A CN202210080511A CN114397570A CN 114397570 A CN114397570 A CN 114397570A CN 202210080511 A CN202210080511 A CN 202210080511A CN 114397570 A CN114397570 A CN 114397570A
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- platform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention relates to a gas relay checking device which comprises a checking platform and a first lifting platform, wherein the first lifting platform is used for placing a gas relay; the first lifting platform is arranged on the calibration platform in a lifting mode; the left and right sides of the first lifting platform are provided with sliding chutes; the width of the left end of the sliding chute is gradually reduced in a front-back symmetrical mode when the width of the left end of the sliding chute approaches to the direction of the end part; a placing groove is formed in the sliding groove along the left-right direction, a first clamping jaw which is mutually matched with the placing groove is arranged in the placing groove, and the first clamping jaw is matched with the placing groove through a sliding pin shaft; the left end of the first fixing table is hinged with a second clamping jaw, and the second clamping jaw can rotate forwards and backwards. When the gas relay with the base is checked, the deviation in the front-back direction can be automatically eliminated in the clamping process; guarantee the precision of butt joint, when the buchholz relay that does not have the base need the check-up, can adopt first jack catch and second jack catch to carry out the centre gripping, avoided the defect of the unable centre gripping of traditional device, realize advancing accurate effectual centre gripping to different types of buchholz relay.
Description
Technical Field
The invention belongs to the technical field of power transformer detection, and particularly relates to a gas relay calibration device.
Background
The gas relay (also called as gas relay) is a protector for transformer, and is installed on the pipeline between oil tank and oil conservator of transformer, when the fault in the transformer is used to decompose oil to produce gas or cause oil flow surge, the contact of gas relay is operated to connect the designated control loop and send out signal alarm in time.
The gas relay has various types, and is visually distinguished from the appearance, including the existence of a base and the absence of the base; the buchholz relay with the base is usually arranged in a pipeline with a supporting platform, for example, a pipeline for detecting a corresponding transformer is arranged on the ground or some supporting platforms, the buchholz relay connected into the pipeline is the buchholz relay with the base, and the base can be directly fixed on the ground or the corresponding platform; some transformers are in the higher position in ground, in order to detect the needs, directly on the flange connection of buchholz relay through its two ports on built on stilts oil circuit pipeline usually, in order to reduce the influence of weight to oil circuit pipeline, often will not have the buchholz relay intercommunication of base on the transformer under this mode.
Before the gas relay leaves a factory, strict trigger tests are carried out, and the gas relay is used in the circulation market after being qualified. After long-time use, the transformer can have the phenomenon of "malfunctioning" or "hypersensitive", leads to in the actual work, and buchholz relay can not in time effectually protect the transformer.
Under the above background, various buchholz relay checking devices are available on the market, for example, the invention patent of a buchholz relay checking instrument with publication number CN112881904A, which includes a checking area and a clamping device, wherein the clamping device includes a fixed plate fixedly arranged and a movable plate movably arranged, the movable plate can move in a clamping direction through an air cylinder to clamp the buchholz relay to be checked, and corresponding flanges are respectively arranged on the fixed plate and the movable plate to butt joint the buchholz relay so as to check the buchholz relay in a subsequent process, however, in an actual checking process, when the buchholz relay is placed, it cannot be guaranteed that the buchholz relay is located in the middle of the front-back direction, under the direct action of the air cylinder, the buchholz relay will be clamped instantly, and position adjustment cannot be performed at all, if there is a position deviation, the adjustment is needed again, which is very inconvenient; in addition, when the buchholz relay without the base exists in the background art, the device can not ensure that the buchholz relay is in a stable and correct position before starting, and can not ensure the accuracy of the position even if the buchholz relay is manually controlled unless the buchholz relay is manually controlled, and the device has certain potential safety hazard and has no accessibility.
Disclosure of Invention
The invention aims to provide a gas relay checking device to solve the problem that different types of gas relays cannot be accurately and effectively clamped during checking.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas relay calibration device comprises a calibration stand and a first lifting stand for placing a gas relay; the first lifting platform is arranged on the checking platform in a lifting mode; the left and right sides of the first lifting platform are provided with sliding chutes; the width of the left end of the sliding chute is gradually reduced in a manner that the direction of the end part is symmetrical from front to back; a placing groove is formed in the sliding groove along the left-right direction, a first clamping jaw which is mutually matched with the placing groove is arranged in the placing groove, and the first clamping jaw is matched with the placing groove through a sliding pin shaft; the left end of the first fixing table is hinged with a second clamping jaw, and the second clamping jaw can rotate forwards and backwards.
Preferably, the side wall of the placing groove is provided with a straight groove hole, the length direction of the straight groove hole is arranged along the left-right direction, the first clamping jaw is provided with a pin shaft, and the pin shaft is matched with the straight groove hole through a sliding pin shaft.
Preferably, the first clamping jaw and the second clamping jaw are respectively provided with a clamping part for clamping the inlet end and the outlet end of the gas relay.
Preferably, a second lifting platform is arranged at the right end of the first lifting platform; the second lifting platform is arranged on the checking platform in a lifting mode; the second elevating platform includes elevating platform and lower elevating platform, and it is equipped with first butt joint pipeline to go up to run through from top to bottom on the elevating platform, it is equipped with the second and takes over the pipeline to run through from top to bottom on the elevating platform down, lower elevating platform top surface be equipped with the second is to taking over the bar groove of pipeline intercommunication, the bar groove with first butt joint pipeline communicates with each other.
Preferably, the upper lifting platform is provided with a fixed plate and a right butt joint pipeline, the first butt joint pipeline penetrates through the fixed plate and is arranged on the left and right sides, and the right end of the first butt joint pipeline is fixedly arranged on the first butt joint pipeline and communicated with the first butt joint pipeline; be equipped with the solid fixed ring that is used for butt buchholz relay on the fixed plate, be equipped with the cylinder on the fixed plate, gu fixed ring sets up on the cylinder stretches out the end.
Further preferably, an electric push rod for controlling the upper lifting platform to slide left and right relative to the lower lifting platform is arranged on the left side of the second lifting platform.
Preferably, the calibration table comprises a support plate, the support plate is fixedly arranged in the calibration table from left to right, and the first lifting table and the second lifting table are both arranged on the support plate through guide posts and guide sleeves; electric push rods are arranged between the first lifting platform and the second lifting platform and between the supporting plates.
Further preferably, a left butt joint pipeline for butt joint with a gas relay is arranged on the left side of the first lifting platform.
Further preferably, a control console for controlling the actions of the air cylinder and the electric push rod is arranged on the checking platform.
The invention has the beneficial effects that:
a gas relay calibration device comprises a calibration stand and a first lifting stand for placing a gas relay; the left and right sides of the first lifting platform are provided with sliding chutes; the width of the left end of the sliding chute is gradually reduced in a manner that the direction of the end part is symmetrical from front to back; when the gas relay with the base needs to be checked, the base can be placed in the sliding groove, the base moves leftwards under the action of the subsequent corresponding clamping device, and meanwhile, due to the fact that the sliding groove acts, the gas relay is gradually located in the center of the front and back directions of the sliding groove, and the deviation of the front and back directions is automatically eliminated in the clamping process. Compared with the technical scheme of the file disclosed in the background art, the invention can eliminate the front and back direction deviation of the gas relay in the clamping process without repeating for many times to ensure the butt joint position; the butt joint precision is improved, the placing groove is formed in the sliding groove along the left-right direction, the first clamping jaw mutually matched with the placing groove is arranged in the placing groove, and the first clamping jaw is matched with the placing groove through a sliding pin shaft; the left end of the first fixing table is hinged with a second clamping jaw, the second clamping jaw can rotate back and forth, when the gas relay without the base needs to be checked, columnar inlet and outlet ends at the left end and the right end of the gas relay can be respectively clamped on the first clamping jaw and the second clamping jaw, and the defect that the gas relay cannot be fixedly placed for clamping and butt joint due to the fact that the base does not exist is avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the connection between the guide post and guide sleeve assembly and the support plate;
FIG. 4 is a cross-sectional view of the upper landing of the present invention;
fig. 5 is a sectional view of the lower lift table of the present invention.
Names corresponding to the marks in the figure:
1. calibration table, 10, the backup pad, 2, first elevating platform, 20, the spout, 21, first jack catch, 22, the second jack catch, 23, the standing groove, 3, the second elevating platform, 30, lower elevating platform, 31, the platform that goes up, 32, the right butt joint pipeline, 33, the fixed plate, 34, the cylinder, 35, first butt joint pipeline, 36, solid fixed ring, 37, the second butt joint pipeline, 38, the bar groove, 4, the control cabinet, 5, the left butt joint pipeline, 6, guide pillar and guide bush subassembly, 7, the clamping part.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below.
The embodiment of the invention comprises the following steps:
as shown in fig. 1, a buchholz relay checking device comprises a checking table 1 and a first lifting table 2 for placing a buchholz relay.
The checking platform 1 is a main body part of the whole device and has an upper cuboid structure as a whole; the upper surface of the calibration stand 1 is used for placing and calibrating a gas relay; the inside of check-up platform 1 is provided with oil tank, oil pump, corresponding connecting tube and valve, and it is prior art here, will not do too much and describe.
As shown in fig. 1-3, a first lifting platform 2 is arranged on a checking platform 1 in a lifting manner; the first lifting platform 2 is provided with a sliding chute 20 at left and right, the width of the sliding chute 20, that is, the distance in the front-back direction, is different in the left-right direction, specifically, the width of the sliding chute 20 is equal in a distance in the middle of the sliding chute 20, when moving towards the left end of the sliding chute 20, the width of the sliding chute 20 gradually decreases, and becomes zero at the left end of the sliding chute 20, that is, the front and back side walls intersect, in this embodiment, the part of the sliding chute 20 with gradually decreasing width is cone-shaped, that is, the cone tip part is the leftmost end of the sliding chute 20, and the leftmost end is located on the straight line where the middle of the front-back direction in the equal-width part of the sliding chute 20, for the gas relay with a base in the background art, when checking, the base is placed in the sliding chute 20, and under the action of the corresponding clamping part, the gas relay continuously moves to left, because the sliding chutes 20 with different widths are provided, in the process of moving leftward, the buchholz relay continuously moves toward the middle of the front-rear direction under the action of the side wall of the chute 20, thereby automatically correcting the deviation existing in the front-rear direction. The situation that multiple clamping is carried out to find the correct clamping position is avoided. A placing groove 23 is formed in the sliding groove 20 along the left-right direction, a first clamping jaw 21 matched with the placing groove 23 is arranged in the placing groove 23, and the first clamping jaw 21 is matched with the placing groove 23 in a sliding pin shaft mode; the first claw 21 is matched with the placing groove 23 through a sliding pin shaft, so that the first claw 21 can slide left and right in the sliding groove 20 and can also rotate in the sliding groove 20; the fit here means that when the first catch 21 is rotated in the slide groove 20, there may be a rotational state directly inside the slide groove 20.
And a second claw 22 is further hinged at the left end of the first fixed table, and the second claw 22 can rotate back and forth.
In the face of the buchholz relay mentioned in the background art, where there is no base, the first claw 21 may be rotated out of the placing groove 23 and rotated to the vertical direction; then, the second jaw 22 is rotated to the vertical direction in the same way, and then two cylindrical inlet and outlet ends of the buchholz relay without the base are erected at the upper ends of the first jaw 21 and the second jaw 22 respectively, which is worth mentioning that, because the first jaw 21 rotates in the strict left-right direction and the second jaw 22 rotates in the strict front-back direction, after the buchholz relay without the base is erected, the buchholz relay does not swing back and forth or left-right, so that the placing stability of the buchholz relay is ensured, what should be more noted is that, if the first jaw 21 and the second jaw do not rotate simultaneously in the vertical state, the buchholz relay whose appearance meets the standard (the axes of the inlet and outlet ends are coaxial) can not be completely placed on the first jaw 21 and the second jaw 22, that is, each time of placing of the buchholz relay is positioned in the middle of the front-back direction, and there is no inclination deviation in the front-rear-left-right direction.
The first latch 21 and the second latch 22 are movably disposed, so as to ensure that the device can flexibly switch and adapt to different buchholz relays when facing the buchholz relay with a base and the buchholz relay without a base.
As shown in fig. 1-2, in the present embodiment, front and rear side walls of the placement groove 23 are respectively provided with front and rear corresponding straight slot holes 24, the first jaw 21 is provided with a pin shaft, the pin shaft penetrates through the first jaw 21, and two ends of the pin shaft are respectively located in the front and rear straight slot holes 24, so as to realize the sliding fit of the pin shaft of the first jaw 21 and the placement groove 23.
The upper ends of the first claw 21 and the second claw 22 are respectively provided with a clamping part 7 for clamping the inlet and outlet ends of the gas relay. Clamping part 7 is the Y type, and the inboard that contacts with buchholz relay on the clamping part 7 is the echelonment, and when cylindric buchholz relay business turn over end joint was in clamping part 7, with buchholz relay contact will be the sharp-pointed arris relatively between two adjacent ladders, can firmly carry out the centre gripping with buchholz relay just.
As shown in fig. 2-3, a second lifting platform 3 is arranged at the right end of the first lifting platform 2; the second lifting platform 3 is arranged on the calibration platform 1 in a lifting manner; the second lifting platform 3 comprises an upper lifting platform 31 and a lower lifting platform 30, the upper lifting platform 31 and the lower lifting platform 30 are arranged together in a left-right sliding mode, and before sliding assembly, the upper lifting platform 31 can only slide in from the left end or the right end of the lower lifting platform 30, so that the upper lifting platform 31 and the lower lifting platform 30 cannot be directly separated in the vertical direction, and the matching sealing performance of the upper lifting platform 31 and the lower lifting platform 30 is guaranteed.
As shown in fig. 4-5, a first butt-joint pipe 35 is vertically penetrated through the upper lifting platform 31, a second butt-joint pipe 37 is vertically penetrated through the lower lifting platform 30, a strip-shaped groove 38 is formed in the top surface of the lower lifting platform 30, the strip-shaped groove 38 is communicated with the second butt-joint pipe 37, and during the moving process of the upper lifting platform 31 and the lower lifting platform 30, the lower end of the first butt-joint pipe 35 is always communicated with the strip-shaped groove 38, so that the corresponding pipes butted with the buchholz relay can be normally circulated regardless of the left and right sizes of the buchholz relay.
The upper lifting platform 31 is provided with a fixing plate 33 and a right butt joint pipeline 32, the fixing plate 33 is vertically arranged on the upper surface of the upper lifting platform 31, a round hole penetrates through the fixing plate 33 from left to right, the right butt joint pipeline 32 penetrates through the round hole in the fixing plate 33 and is arranged at the upper end of the first pair of connecting pipelines 35 and is mutually communicated with the first pair of connecting pipelines 35, and the fixing plate 33 is provided with a fixing ring 36 for abutting against a gas relay; be equipped with cylinder 34 on the fixed plate 33, gu fixed ring 36 sets up on the stretching out end of cylinder 34, in this embodiment, under the prerequisite of guaranteeing the butt joint leakproofness, in order to make solid fixed ring 36 atress butt buchholz relay evenly, specially set up cylinder 34 into four, and even interval arranges around the round hole, and during the cylinder 34 action, four cylinders 34 move simultaneously, with solid fixed ring 36 promote left and compress tightly on buchholz relay.
The right side of second elevating platform 3 is equipped with one and is used for controlling elevating platform 31 for the gliding electric putter in the left and right sides of elevating platform 30 down, and after cylinder 34 compressed tightly buchholz relay, electric putter action promoted elevating platform 31 and moves left, and elevating platform 31 drives the motion of right butt joint pipeline 32, pastes tightly on buchholz relay, and this in-process can drive cylinder 34 further compress tightly buchholz relay simultaneously, the dual effect of guaranteeing to compress tightly.
As shown in fig. 3, the calibration stand 1 further includes a supporting plate 10, the supporting plate 10 is transversely disposed inside the calibration stand 1, the guide post and guide sleeve assemblies 6 are disposed on the lower bottom surfaces of the first lifting table 2 and the second lifting table 3 at positions corresponding to four corners of the first lifting table and the second lifting table, and electric push rods are used for providing power for the first lifting table and the second lifting table to lift up and down.
The left side of first elevating platform 2 is equipped with the left butt joint pipeline 5 that is used for with the buchholz relay butt joint. The left side of first elevating platform 2 is equipped with the fixed station, is equipped with the left butt joint pipeline 5 that can stretch out and draw back on the fixed station, and left butt joint pipeline 5 adopts electric putter control, and the direct butt of electric putter is on left butt joint pipeline 5.
The calibration stand 1 is provided with a console 4 for controlling the operation of the air cylinder 34 and the electric push rod.
The working principle is as follows:
and checking the working principle of the gas relay with the base.
The first jaw 21 is turned to the left to be just inside the placing groove 23 and the second jaw 22 is turned to the rear to avoid interference with the left docking pipe 5. Place buchholz relay's base in spout 20, the length that stretches out according to buchholz relay's size adjustment left side butt joint pipeline 5, buchholz relay's base has been located in the spout 20 in the section region that the width reduces gradually when guaranteeing buchholz relay's tip and the butt joint of left butt joint pipeline 5, and suitably adjust the height of first elevating platform 2 and second elevating platform 3, later control cylinder 34 action, make cylinder 34 stretch out solid fixed ring 36 on the end and support tightly buchholz relay's right-hand member, then control the electric putter action on elevating platform 31, promote right butt joint pipeline 32 and buchholz relay and carry out the pipeline butt joint, to this, accomplish the centre gripping butt joint, follow-up check-up to buchholz relay again.
And checking the working principle when the gas relay of the base does not exist.
Rotating the first jaw 21 to the right, rotating the first jaw 21 to a vertical direction; rotate second jack catch 22, make second jack catch 22 be in vertical state, will take the column business turn over end at the left and right sides both ends of not having the buchholz relay of base joint respectively on the clamping part 7 of first jack catch 21 and second jack catch 22, first jack catch 21 can be in standing groove 23 the regulation when left and right slip is in order to realize to unidimensional buchholz relay. The working principle of the subsequent clamping butt joint is the same as that of the gas relay with the base in the checking process.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (9)
1. The gas relay calibration device is characterized by comprising a calibration table and a first lifting table for placing a gas relay;
the first lifting platform is arranged on the checking platform in a lifting mode; the left and right sides of the first lifting platform are provided with sliding chutes; the width of the left end of the sliding chute is gradually reduced in a manner that the direction of the end part is symmetrical from front to back; a placing groove is formed in the sliding groove along the left-right direction, a first clamping jaw which is mutually matched with the placing groove is arranged in the placing groove, and the first clamping jaw is matched with the placing groove through a sliding pin shaft;
the left end of the first fixing table is hinged with a second clamping jaw, and the second clamping jaw can rotate forwards and backwards.
2. The buchholz relay calibration device according to claim 1, wherein a straight slot hole is formed in a side wall of the placement groove, the straight slot hole is arranged in a left-right direction in a length direction, a pin shaft is arranged on the first jaw, and the pin shaft is in sliding pin fit with the straight slot hole.
3. The buchholz relay calibration device according to claim 1, wherein the first jaw and the second jaw are each provided with a clamping portion for clamping an inlet and an outlet of the buchholz relay.
4. The gas relay checking device according to claim 1, wherein a second lifting platform is arranged at the right end of the first lifting platform; the second lifting platform is arranged on the checking platform in a lifting mode; the second elevating platform includes elevating platform and lower elevating platform, and it is equipped with first butt joint pipeline to go up to run through from top to bottom on the elevating platform, it is equipped with the second and takes over the pipeline to run through from top to bottom on the elevating platform down, lower elevating platform top surface be equipped with the second is to taking over the bar groove of pipeline intercommunication, the bar groove with first butt joint pipeline communicates with each other.
5. The gas relay calibration device according to claim 4, wherein a fixed plate and a right butt joint pipeline are arranged on the upper lifting platform, the first butt joint pipeline penetrates through the fixed plate to be arranged on the left and right, and the right end of the first butt joint pipeline is fixedly arranged on the first butt joint pipeline and communicated with the first butt joint pipeline; be equipped with the solid fixed ring that is used for butt buchholz relay on the fixed plate, be equipped with the cylinder on the fixed plate, gu fixed ring sets up on the cylinder stretches out the end.
6. The buchholz relay checking device according to claim 5, wherein an electric push rod for controlling the upper lifting platform to slide left and right relative to the lower lifting platform is arranged on the left side of the second lifting platform.
7. The buchholz relay calibration device according to claim 6, wherein the calibration stand comprises a support plate, the support plate is fixedly arranged inside the calibration stand from left to right, and the first lifting stand and the second lifting stand are both arranged on the support plate through guide posts and guide sleeves; electric push rods are arranged between the first lifting platform and the second lifting platform and between the supporting plates.
8. The buchholz relay calibration device according to claim 1, wherein a left docking pipe for docking with the buchholz relay is provided on the left side of the first lifting table.
9. The gas relay calibration device according to claim 7, wherein a console for controlling the operation of the air cylinder and the electric push rod is arranged on the calibration console.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080511.3A CN114397570B (en) | 2022-01-24 | 2022-01-24 | Gas relay calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080511.3A CN114397570B (en) | 2022-01-24 | 2022-01-24 | Gas relay calibration device |
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| Publication Number | Publication Date |
|---|---|
| CN114397570A true CN114397570A (en) | 2022-04-26 |
| CN114397570B CN114397570B (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210080511.3A Active CN114397570B (en) | 2022-01-24 | 2022-01-24 | Gas relay calibration device |
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| Country | Link |
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| CN (1) | CN114397570B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117949704A (en) * | 2024-03-27 | 2024-04-30 | 广东电网有限责任公司佛山供电局 | Relay test fixture, control method thereof and test device |
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| CN112666371A (en) * | 2021-01-15 | 2021-04-16 | 西安亚能电气有限责任公司 | Fixing device for gas relay calibrator |
| CN112881904A (en) * | 2021-01-15 | 2021-06-01 | 西安亚能电气有限责任公司 | Gas relay calibrator |
| CN113484746A (en) * | 2021-07-28 | 2021-10-08 | 刘闯闯 | Gas relay calibration device |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2829061Y (en) * | 2005-10-08 | 2006-10-18 | 冉正华 | Light gas relay tester |
| CN102889906A (en) * | 2012-10-17 | 2013-01-23 | 冉正华 | Single-pipe gas relay detecting bench, centering clamping mechanism and detection method thereof |
| CN107433556A (en) * | 2017-09-18 | 2017-12-05 | 国网山东省电力公司济南供电公司 | A kind of Buchholz relay overhauls dedicated platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949704A (en) * | 2024-03-27 | 2024-04-30 | 广东电网有限责任公司佛山供电局 | Relay test fixture, control method thereof and test device |
| CN117949704B (en) * | 2024-03-27 | 2024-06-21 | 广东电网有限责任公司佛山供电局 | Relay test fixture, control method thereof and test device |
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| Publication number | Publication date |
|---|---|
| CN114397570B (en) | 2022-10-25 |
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