A method for detecting a leak in a large circuit breaker

Abstract

This invention relates to a leak detection method for large circuit breakers. First, the components constituting the large circuit breaker, including the poles, base, and operating mechanism, are assembled on a pallet. Then, the entire pallet is transported to a dedicated bagging system for bagging. The poles are bagged using the dedicated bagging system. The large circuit breaker is then wired to the pallet, and the pallet is wired to a break-in device. The break-in device begins operation to test for SF6 gas leakage during the operation of the large circuit breaker. The SF6 content in the gas inside the PE sealed bag is detected to determine if a leak has occurred. This leak detection method, using a dedicated bagging system, achieves automated bagging of the large circuit breaker, eliminating the need for manual top-down bagging of the poles, significantly reducing manual labor and eliminating the need for manual climbing, thus preventing safety accidents.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker leak detection, and particularly to a method for leak detection of large circuit breakers. Background Technology

[0002] Porcelain column circuit breakers are important equipment for ensuring the safe operation of ultra-high voltage or extra-high voltage power systems. The circuit breaker's break point is supported at the top by a porcelain column, which serves both as insulation and as a support component.

[0003] Porcelain column circuit breakers typically use sulfur hexafluoride gas as the internal insulation and arc-extinguishing medium. Therefore, after porcelain column circuit breakers are manufactured, they need to undergo leak testing to ensure product qualification.

[0004] For example, patent CN111678659A mentions a leak detection method for porcelain-column circuit breakers, which includes the following steps: First, filler is inserted into the bracket and operating mechanism bracket of the circuit breaker to be leak-tested; then, the circuit breaker is sent into a dedicated leak detection system; before leak detection, the concentration of SF6 in the leak detection chamber needs to be tested to ensure that the leak detection chamber meets the leak detection standards, then the air inlet and outlet of the leak detection chamber are closed, and the leak detection of the circuit breaker in the leak detection chamber begins. After a certain period of time, the leak detection is ended, and then the leak detector is inserted into each leak detection hole on the leak detection chamber for testing; after the leak detection is completed, the circuit breaker is removed.

[0005] The aforementioned leak detection method requires a dedicated leak detection system. However, due to structural limitations, this system can only perform leak tests on small to medium-sized porcelain-pole circuit breakers. Testing large or extra-large porcelain-pole circuit breakers is significantly restricted: firstly, large porcelain-pole circuit breakers are quite large, requiring a sufficiently large leak detection chamber in the dedicated system; secondly, their large size makes moving them cumbersome. Therefore, a bagging method is still necessary for testing. This bagging process requires working from top to bottom, but again, due to the large size of the porcelain-pole circuit breaker and its considerable height, requires ladders or similar tools, which is cumbersome, inefficient, and poses certain safety hazards. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a leak detection method for large circuit breakers, which can perform leak detection tests on circuit breakers with relatively large dimensions.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for leak detection of large circuit breakers, the innovation of which lies in: including the following steps

[0008] S1: First, prepare a tray for leak detection, which has a connector for connecting the circuit breaker and the break-in equipment.

[0009] S2: Assemble the poles, base, and operating mechanism components that make up the large circuit breaker on the tray to form a complete large circuit breaker;

[0010] S3: The entire pallet is then conveyed to a dedicated bagging system, which includes...

[0011] A support base is provided, on which a support platform is installed. On each side of the support platform, a set of conveyor rollers is installed. Each set of conveyor rollers consists of several conveyor rollers. A flat plate is also installed on the support platform between the two sets of conveyor rollers.

[0012] A bag support frame, the bag support frame including a pair of side supports and an upper support connected to the top of the side supports, the two side supports are respectively located on both sides of the support base, and the upper support is located above the support base;

[0013] A bagging assembly is installed on a bagging bracket. The bagging assembly includes a bagging platform, which includes a platform bracket and bagging plates installed on the platform bracket. The platform bracket is driven to move up and down by a lifting mechanism installed on the upper bracket. The platform bracket is a U-shaped bracket with a cavity for the circuit breaker to pass through vertically. Three bagging plates are installed on the platform bracket, and the three bagging plates correspond one-to-one with the three poles of the large circuit breaker. Each bagging plate includes a pair of parallel plates with a gap between the two plates to allow the poles of the large circuit breaker to pass through. A pneumatic gripper is installed on each side of the plate. The plate moves horizontally along the platform bracket, thereby realizing the translation of the entire bagging plate.

[0014] Move the pallet to the support platform and wait for bagging;

[0015] S4: The bagging plates are moved horizontally along the platform support, so that the three bagging plates are offset from the three poles of the large circuit breaker. Then, the platform support begins to descend. After the platform support descends to a certain height, three PE sealing bags for bagging test are manually taken. The four pneumatic grippers on the bagging plates clamp the opening of the PE sealing bags to keep the opening of the PE sealing bags open. The platform support moves up to the top, and the bagging plates are moved horizontally along the platform support again, so that the three bagging plates are directly above the three poles of the large circuit breaker. The platform support descends again. While descending, the open PE sealing bags are put on the three poles. After the platform support descends to the bottom, the pneumatic grippers release the PE sealing bags, and the opening of the PE sealing bags is tied tightly by hand to complete the bagging.

[0016] S5: Connect the large circuit breaker to the tray via a wired connection to the connector on the tray, and connect the tray to the break-in equipment via a wired connection.

[0017] S6: The break-in equipment starts working, and the actual operation of a large circuit breaker is simulated by the intermediate fit of the tray. The test is conducted to see if there is any SF6 gas leakage during the operation of the large circuit breaker.

[0018] S7: After the break-in equipment has been running for 3-4 hours, stop the operation and test the SF6 in the gas inside the PE sealed bag to determine if there is a leak.

[0019] Furthermore, the height of the upper surface of the plate is lower than the height of the apex of the conveying roller.

[0020] Furthermore, the lifting mechanism comprises: a pair of parallel drums mounted on the upper support; the two drums are driven synchronously by a motor mounted on the upper support through a linkage shaft; two rolls of synchronous belt are wound on each drum; a partition is also installed on the drum to separate the two rolls of synchronous belt; the winding directions of the two rolls of synchronous belt are opposite, and the synchronous belts exit in opposite directions from the drums; pulleys are also located at the four corners of the upper support, each corresponding to a synchronous belt; after the synchronous belt is released from the drum, it passes through the pulleys and connects to the platform support, thereby pulling the platform support to move up and down.

[0021] Furthermore, the horizontal mechanism comprises: a pair of parallel translation guide rails mounted on the platform support; a translation slider that cooperates with the two translation guide rails mounted on the plate; a translation screw located between the two translation guide rails on the platform support; and a translation nut that cooperates with the translation screw mounted on the plate. The translation screw is driven to rotate by a motor mounted on the platform support, which in turn drives the plate to reciprocate along the extension direction of the translation guide rails.

[0022] The advantages of this invention are as follows: The leak detection method of this invention uses a dedicated bagging system to detect leaks in large circuit breakers, realizing automatic bagging of large circuit breakers. It eliminates the need for manual bagging of the poles from top to bottom, greatly reducing manual labor and eliminating the need for manual climbing, thus avoiding safety accidents. The entire bagging process is convenient and quick, which correspondingly improves the efficiency of leak detection.

[0023] The height of the upper surface of the flat plate is lower than the height of the top of the conveyor roller to avoid interference between the flat plate and the pallet when the pallet containing the circuit breaker is being transported using the conveyor roller.

[0024] The lifting mechanism is designed with a motor and linkage shaft, so only one motor is needed to drive the synchronous unwinding or rewinding of four synchronous belts, achieving synchronous movement and ensuring that the platform support can be stably raised and lowered. It also reduces the number of active drive components required and simplifies the structure. By designing two synchronous belt rolls with different winding directions on a single drum, and coordinating the unwinding of the two synchronous belt rolls in different directions, the rotation of the drum can achieve simultaneous unwinding or rewinding of the two synchronous rolls. The partition design is to prevent interference between the two synchronous belt rolls during unwinding or rewinding. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a schematic diagram of the bagging system specifically used in this invention.

[0027] Figure 2 This is a front view of the bagging system specifically used in this invention. Detailed Implementation

[0028] The following embodiments are intended to enable those skilled in the art to more fully understand the present invention, but do not limit the invention to the scope of the embodiments described.

[0029] The leak detection method for large circuit breakers of the present invention is achieved through the following steps:

[0030] S1: First, prepare a tray for leak detection, which has a connector for connecting the circuit breaker and the break-in equipment.

[0031] S2: The components that make up the large circuit breaker, such as the poles, base, and operating mechanism, are transported to the pallet position by hoisting or trolley transport. Then, the components are assembled on the pallet to form a complete large circuit breaker.

[0032] S3: The entire pallet is then conveyed to a dedicated bagging system, such as... Figure 1 , Figure 2 As shown in the schematic diagram, the dedicated bagging system includes

[0033] A support base 1 is provided, with its bottom supported by several support legs 102. A support platform 101 is mounted on the support base 1. The support platform 101 is a U-shaped frame. A conveyor roller group is mounted on each side of the support platform 101. Each conveyor roller group consists of several conveyor rollers 103. The two sides of the conveyor rollers 103 are movably mounted on the support platform 101 through the cooperation of bearings and bearing seats. The conveyor rollers 103 in the same conveyor roller group are linked through the cooperation of sprockets and chains to achieve synchronous and unidirectional rotation. Any one of the conveyor rollers 103 is driven to rotate by a motor mounted on the support platform 101, which in turn drives all the conveyor rollers 103 to rotate. The conveying directions of the two conveyor roller groups are the same.

[0034] A flat plate 104 is also installed on the support platform 101 between the two sets of conveyor rollers. The flat plate 104 is a rectangular plate, and the height of the upper end of the flat plate 104 is lower than the height of the apex of the conveyor roller 103. The height of the upper end of the flat plate 104 is lower than the height of the apex of the conveyor roller 103 to avoid interference between the flat plate and the pallet when the pallet containing the circuit breaker is being conveyed by the conveyor roller 103.

[0035] A bag support includes a pair of side supports 201 and an upper support 202 connected to the top of the side supports 201. Both the side supports 201 and the upper support 202 are rectangular frame structures welded together by several horizontal and vertical bars. The two side supports 201 are located on both sides of the support base 1, and the upper support 202 is located above the support base 1. A gap is left between the upper support 202 and the support base 1 to allow the tray and large circuit breaker to pass through and move horizontally.

[0036] A bagging assembly mounted on a bagging bracket, the bagging assembly including a bagging platform.

[0037] The bagging platform includes a platform support 3 and a bagging plate 31 installed on the platform support 3. The platform support 3 is driven to move up and down by a lifting mechanism installed on the upper support 202. The lifting mechanism consists of a pair of parallel rollers 32 installed on the upper support 202. The two sides of the rollers 32 are movably installed on the upper support 202 through the cooperation of bearings and bearing seats. The two rollers are driven to rotate synchronously by a motor 33 installed on the upper support 202 through the cooperation of a linkage shaft 34.

[0038] Two synchronous belt rolls are wound on each drum 32. A partition is installed on the drum 32 to separate the two synchronous belt rolls. The winding directions of the two synchronous belt rolls are opposite, and the synchronous belts 35 are discharged from the drum 32 in two opposite directions. At the four corners of the upper support 202, there are pulleys 36 that correspond to the synchronous belts 35 one by one. The pulleys 36 are fixed to the upper support 202 by pulley seats. After the synchronous belts 35 are released from the drum 32, they are connected to the platform support 3 after passing through the pulleys 36. The four synchronous belts 35 discharged from each drum 32 are connected to the four corners of the platform support 3, thereby pulling the platform support 3 to move up and down. The lifting mechanism is designed with a motor and linkage shaft, so only one motor is needed to drive the synchronous unwinding or rewinding of four synchronous belts, achieving synchronous movement and ensuring that the platform support can be stably raised and lowered. It also reduces the number of active drive components required and simplifies the structure. By designing two synchronous belt rolls with different winding directions on a single drum, and coordinating the unwinding of the two synchronous belt rolls in different directions, the rotation of the drum can achieve simultaneous unwinding or rewinding of the two synchronous rolls. The partition design is to prevent interference between the two synchronous belt rolls during unwinding or rewinding.

[0039] Platform support 3 is a U-shaped support with a cavity for the circuit breaker to pass through vertically. Three bag-type plates are installed on platform support 3, each corresponding to one of the three poles of the large circuit breaker. Each bag-type plate includes a pair of parallel plates 31 with a gap between the two plates 31 to allow the poles of the large circuit breaker to pass through. A pneumatic gripper is installed on each side of the plate 31. The plate 31 moves horizontally along platform support 3, thereby realizing the translation of the entire bag-type plate.

[0040] The horizontal mechanism consists of a pair of parallel translation guide rails mounted on the platform support 3, a translation slider that cooperates with the two translation guide rails mounted on the plate 31, a translation screw located between the two translation guide rails on the platform support 3, and a translation nut that cooperates with the translation screw mounted on the plate 31. The translation screw is driven to rotate by a motor mounted on the platform support, which in turn drives the plate 31 to reciprocate along the extension direction of the translation guide rails.

[0041] Move the pallet to the support platform to wait for bagging; the two sides of the pallet are supported by two sets of support rollers.

[0042] S4: The bagging plates move horizontally along the platform support 3, so that the three bagging plates are offset from the three poles of the large circuit breaker. Then, the motor 33 drives the two drums 32 to rotate, causing the synchronous belt 35 to be unloaded. At this time, the platform support 3 begins to descend. After the platform support 3 descends to a certain height, three PE sealing bags for the bagging test are manually removed. The four pneumatic grippers on the bagging plates clamp the opening of the PE sealing bags, keeping the bag opening open. Then, the motor 33 flips over. The drive drum 32 rotates, causing the synchronous belt to begin winding, which pulls the platform support 3 upward until it reaches the top and stops moving upward. The bagging plates then move horizontally along the platform support 3, so that the three bagging plates are directly above the three poles of the large circuit breaker. The platform support 3 then moves downward, and while moving downward, the PE sealing bags with open openings are placed on the three poles. After the platform support 3 has moved to its position, the pneumatic grippers release the PE sealing bags, and then the openings of the PE sealing bags are manually tied to complete the bagging.

[0043] S5: Connects the large circuit breaker to the tray via a wired connection to the connector on the tray, thereby connecting the tray to the break-in equipment.

[0044] S6: The break-in equipment begins operation, simulating the actual operation of a large circuit breaker through the intermediate mating of the tray, and testing whether SF6 gas leakage occurs during the operation of the large circuit breaker.

[0045] S7: After the break-in equipment has been running for 3-4 hours, stop the operation and test the SF6 in the gas inside the PE sealed bag to determine if there is a leak.

[0046] The leak detection method in this invention uses a dedicated bagging system to detect leaks in large circuit breakers, achieving automatic bagging of large circuit breakers. This eliminates the need for manual bagging of the terminals from top to bottom, greatly reducing manual labor and avoiding the need for manual climbing, thus preventing safety accidents. The entire bagging process is convenient and quick, which correspondingly improves the efficiency of leak detection.

[0047] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for leak detection of large circuit breakers, characterized in that: Includes the following steps S1: First, prepare a tray for leak detection, which has a connector for connecting the circuit breaker and the break-in equipment. S2: Assemble the poles, base, and operating mechanism components that make up the large circuit breaker on the tray to form a complete large circuit breaker; S3: The entire pallet is then conveyed to a dedicated bagging system, which includes... A support base is provided, on which a support platform is installed. On each side of the support platform, a set of conveyor rollers is installed. Each set of conveyor rollers consists of several conveyor rollers. A flat plate is also installed on the support platform between the two sets of conveyor rollers. A bag support frame, the bag support frame including a pair of side supports and an upper support connected to the top of the side supports, the two side supports are respectively located on both sides of the support base, and the upper support is located above the support base; A bagging assembly is installed on a bagging bracket. The bagging assembly includes a bagging platform, which includes a platform bracket and bagging plates installed on the platform bracket. The platform bracket is driven to move up and down by a lifting mechanism installed on the upper bracket. The platform bracket is a U-shaped bracket with a cavity for the circuit breaker to pass through vertically. Three bagging plates are installed on the platform bracket, and the three bagging plates correspond one-to-one with the three poles of the large circuit breaker. Each bagging plate includes a pair of parallel plates with a gap between the two plates to allow the poles of the large circuit breaker to pass through. A pneumatic gripper is installed on each side of the plate. The plate moves horizontally along the platform bracket, thereby realizing the translation of the entire bagging plate. Move the pallet to the support platform and wait for bagging; S4: The bagging plates are moved horizontally along the platform support, so that the three bagging plates are offset from the three poles of the large circuit breaker. Then, the platform support begins to descend. After the platform support descends to a certain height, three PE sealing bags for bagging test are manually taken. The four pneumatic grippers on the bagging plates clamp the opening of the PE sealing bags to keep the opening of the PE sealing bags open. The platform support moves up to the top, and the bagging plates are moved horizontally along the platform support again, so that the three bagging plates are directly above the three poles of the large circuit breaker. The platform support descends again. While descending, the open PE sealing bags are put on the three poles. After the platform support descends to the bottom, the pneumatic grippers release the PE sealing bags, and the opening of the PE sealing bags is tied tightly by hand to complete the bagging. S5: Connects the large circuit breaker to the tray via a wired connection to the connector on the tray, thereby connecting the tray to the break-in equipment. S6: The break-in equipment starts working, and the actual operation of a large circuit breaker is simulated by the intermediate fit of the tray. The test is conducted to see if there is any SF6 gas leakage during the operation of the large circuit breaker. S7: After the break-in equipment has been running for 3-4 hours, stop the operation and test the SF6 in the gas inside the PE sealed bag to determine if there is a leak.

2. The method for leak detection of large circuit breakers according to claim 1, characterized in that: The height of the upper surface of the plate is lower than the height of the apex of the conveying roller.

3. The method for leak detection of large circuit breakers according to claim 1, characterized in that: The lifting mechanism consists of a pair of parallel drums mounted on an upper support. The two drums are driven synchronously by a motor mounted on the upper support via a linkage shaft. Two rolls of synchronous belt are wound on each drum. A partition is also installed on the drum to separate the two rolls of synchronous belt. The two rolls of synchronous belt are wound in opposite directions, and the synchronous belt exits in opposite directions from the drums. At the four corners of the upper support, there are pulleys that correspond to the synchronous belt. After the synchronous belt is released from the drum, it passes through the pulleys and connects to the platform support, thereby pulling the platform support to move up and down.

4. The method for leak detection of large circuit breakers according to claim 1, characterized in that: The horizontal mechanism consists of a pair of parallel translation guide rails mounted on a platform support, a translation slider mounted on the plate to cooperate with the two translation guide rails, a translation screw mounted on the platform support between the two translation guide rails, and a translation nut mounted on the plate to cooperate with the translation screw. The translation screw is driven to rotate by a motor mounted on the platform support, which in turn drives the plate to reciprocate along the extension direction of the translation guide rails.

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