A detachable bus CT module suitable for rapid maintenance of GIS

Abstract

The utility model relates to a detachable bus CT module suitable for the rapid overhaul GIS, including current transformer, the transition shell of fixedly connected in the bottom of current transformer shell and the telescopic joint of fixedly connected in the top of current transformer shell, the top of telescopic joint is fixedly connected with first insulating basin, the bottom of first insulating basin is fixedly connected with first conducting joint, first conducting joint fixedly connects the first conductor that passes through telescopic joint inner chamber, current transformer inner chamber in proper order downwards, the lower end of first conductor extends to transition shell inner chamber and is fixedly connected second conductor through connecting conductor, connecting conductor is detachably fixed with first conductor, second conductor, second conductor extends to the contact seat of circuit breaker unit downwards, transition shell and four -way shell are detachably fixed. The utility model designs the bus that connects CT and circuit breaker into detachable structure, and the clearance of transition shell and circuit breaker four -way shell flange butt joint surface is adjusted with telescopic joint, realizes the quick separation of bus CT module and circuit breaker module.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switch technology, and in particular to the maintenance of GIS, specifically a detachable bus CT module suitable for rapid maintenance of GIS. Background Technology

[0002] Gas-insulated metal-enclosed switchgear is a metal-enclosed switchgear that uses gas as the insulating medium. It mainly consists of circuit breakers, current transformers, busbars, and connectors. These devices or components are enclosed in a grounded metal casing, and their technical performance and reliability far exceed those of conventional switchgear.

[0003] With the continuous expansion of my country's power grid construction, the application scope of GIS (Gas Insulated Metal Enclosed Switchgear) equipment is also constantly expanding. Some special application environments have put forward higher requirements for the high reliability and ease of maintenance of GIS equipment, such as the Yaxia Plateau Hydropower Project under construction.

[0004] Because conventional GIS equipment is spaced out, circuit breakers and current transformers (CTs) are closely connected and form a whole. Once a fault occurs, a large area of ​​GIS equipment units needs to be dismantled, making it impossible to quickly repair and replace the corresponding units. This can easily cause long-term power outages and result in huge economic losses. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a detachable busbar CT module suitable for rapid maintenance of GIS, enabling rapid separation of the busbar CT module from the circuit breaker unit and facilitating rapid maintenance and replacement.

[0006] This utility model is achieved through the following technical solution, providing a detachable bus CT module suitable for rapid maintenance of GIS, including a current transformer, a transition housing fixed to the bottom of the current transformer housing, and an expansion joint fixed to the top of the current transformer housing. The top of the expansion joint is fixedly connected to a first insulating basin, and the bottom of the first insulating basin is fixedly connected to a first conductive joint. The first conductive joint is fixedly connected to a first conductor that passes downward through the inner cavity of the expansion joint and the inner cavity of the current transformer. The lower end of the first conductor extends to the inner cavity of the transition housing and is fixedly connected to a second conductor through a connecting conductor. The connecting conductor is detachably fixedly connected to the first conductor and the second conductor respectively. The second conductor extends downward to the contact seat of the circuit breaker unit.

[0007] The bottom of the transition housing is detachably fixed to the four-way housing of the circuit breaker unit. The side wall of the transition housing is provided with a first opening, and a cover plate is detachably fixed to the first opening.

[0008] With the setup of this solution, when rapid maintenance is required, the connecting conductor and the second conductor can be disassembled through the first port and pulled out from the first port. Then, the connection between the transition housing and the four-way housing of the circuit breaker unit can be separated. By utilizing the extensibility of the expansion joint, the transition housing can be pushed upward to create a gap between the transition housing and the four-way housing of the circuit breaker unit, making it easier to remove the circuit breaker unit and facilitate rapid maintenance.

[0009] As an optimization, the first conductor includes a first cylindrical body and a connector I fixed to the lower end of the first cylindrical body, and the second conductor includes a second cylindrical body and a connector II fixed to the upper end of the second cylindrical body. The top surface of the connecting conductor is in contact with the bottom surface of connector I, and the bottom surface of the connecting conductor is in contact with the top surface of connector II. The connecting conductor is fixed to connector I and connector II respectively by connecting bolts extending vertically. The side of the connecting conductor is provided with a groove adapted to the connecting bolt. Considering the skin effect, the current is concentrated only on the surface of the conductor, and the center of the conductor is basically not current-carrying. In this optimized scheme, both the first and second conductors adopt a cylindrical structure to reduce costs. The connectors I and II facilitate connection with the connecting conductors by vertical connecting bolts, avoiding the occupation of lateral space. The grooves provide space for the installation of the connecting bolts.

[0010] As an optimization, each of the connectors I, II, and the connecting conductor has a vertically penetrating inner hole. The inner cavities of the first and second cylinders are connected through the inner holes of connectors I, II, and the connecting conductor. Ventilation holes are respectively provided on the side walls of the first and second cylinders. This optimized design facilitates the flow of insulating gas.

[0011] As an optimization, a shielding cylinder is fitted onto the connecting conductor. The shielding cylinder extends upwards above the contact point between the first conductor and the connecting conductor, and downwards below the contact point between the second conductor and the connecting conductor. A fastening bolt, reaching the connecting conductor, passes through the side wall of the shielding cylinder, and the fastening bolt is threadedly connected to the side wall of the shielding cylinder. This optimized solution improves the electric field uniformity by using a shielding cylinder to shield the connection points between the connecting conductor and the first and second conductors. The shielding cylinder is fixed in place by the fastening bolts, facilitating its downward sliding away from the connecting conductor and enabling easy assembly and disassembly of the connecting conductor.

[0012] As an optimization, rounded chamfers are provided at both ends of the inner hole of the shielding cylinder. This optimization scheme, by setting the rounded corners, can prevent scratching the surface of the second conductor when moving the shielding cylinder.

[0013] As an optimization, the expansion joint includes an expansion cylinder, flange plates fixed to the upper and lower ends of the expansion cylinder, and several screws passing vertically through the upper and lower flange plates. The flange plates have flange holes coaxial with the inner hole of the expansion cylinder. Adjusting nuts located on the upper and lower sides of the upper flange plate and the lower flange plate are threaded onto the screws. In this optimized expansion joint, the distance between the upper and lower flange plates can be adjusted by turning the adjusting nuts, thus achieving expansion and contraction. This facilitates adjustment of the compression amount of the expansion joint. Simultaneously, the flange plates facilitate connection to the first insulating basin and the current transformer housing.

[0014] As an optimization, a sleeve coaxial with the second conductor is fixed on the contact seat of the circuit breaker unit. The second conductor passes through the inner hole of the sleeve and is connected to the sleeve via a conductive spring. This optimized solution, by setting the sleeve and the conductive spring, not only ensures a reliable connection between the second conductor and the contact seat, but also allows the second conductor to move downward a certain distance when compressed, facilitating the connection and disassembly of the conductor.

[0015] As an optimization, a lower connecting flange is fixed to the bottom of the transition housing, and an upper connecting flange is fixed to the top of the four-way housing of the circuit breaker unit. The lower connecting flange and the upper connecting flange are fixed together by bolts, and a sealing ring is provided between the lower connecting flange and the upper connecting flange. In this optimized scheme, the transition housing and the four-way housing of the circuit breaker unit are connected by flanges, which not only facilitates disassembly but also makes it easy to place the sealing ring to ensure good sealing performance.

[0016] As an optimization, a shielding pit is provided at the bottom of the four-way housing of the circuit breaker unit, located below the contact seat of the circuit breaker unit. This optimization scheme, by setting up the shielding pit, collects any metal foreign objects that may fall during disassembly, acting as a particle trap for particle capture and storage.

[0017] As an optimization, a second opening opposite to the first opening is provided on the side wall of the transition housing, and a cover plate can also be detachably fixed to the second opening. This optimized solution, by providing a second opening, makes it easier to assemble and disassemble the connecting conductor.

[0018] The beneficial effects of this utility model are as follows: by designing the busbar connecting the CT (current transformer) and the circuit breaker as a detachable structure, and using an expansion joint to adjust the gap between the transition housing and the flange mating surface of the circuit breaker four-way housing, the busbar CT module and the circuit breaker module can be quickly separated, which facilitates rapid maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 for Figure 1 Medium local magnification Figure I ;

[0021] Figure 3 for Figure 1 Medium local magnification Figure II ;

[0022] Figure 4 for Figure 1 Medium local magnification Figure III ;

[0023] Figure 5 This is an enlarged view of the conductor connection point;

[0024] Figure 6 This is a schematic diagram of the shielding cylinder structure;

[0025] Figure 7 This is a schematic diagram of the expansion joint structure;

[0026] Figure 8 This is a schematic diagram of the conductor connection structure;

[0027] Figure 9 This is a cross-sectional view of the connected conductors;

[0028] As shown in the figure:

[0029] 1. First insulating basin, 2. First conductive joint, 3. Shielding ring, 4. Expansion joint, 5. Current transformer, 6. First conductor, 7. Transition shell, 8. Joint I, 9. Connecting conductor, 10. Shielding cylinder, 11. Second conductor, 12. Four-way shell, 13. Shielding cover, 14. Support beam, 15. Support leg, 16. Base frame, 17. Circuit breaker unit, 18. Contact seat, 19. Conductive spring, 20. Guide ring, 21. Cover plate, 22. Main sealing ring, 23. Auxiliary sealing ring, 24. Second conductive joint, 25. Second insulating basin. Detailed Implementation

[0030] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0031] like Figure 1 The diagram shows a detachable busbar CT module suitable for rapid maintenance of GIS, including a current transformer 5, a transition housing 7 fixed to the bottom of the current transformer housing, and an expansion joint 4 fixed to the top of the current transformer housing. The top of the expansion joint is fixedly connected to a first insulating basin 1, and the bottom of the transition housing 7 is detachably fixed to the four-way housing 12 of the circuit breaker unit.

[0032] In this embodiment, the upper and lower ends of the expansion joint are respectively sealed and fixed to the first insulating basin and the current transformer housing by bolts. The current transformer housing and the transition housing 7 are sealed and fixed to each other by bolts. The bottom of the transition housing 7 is also sealed and fixed to the four-way housing 12 of the circuit breaker unit by bolts. A main sealing ring 22 and an auxiliary sealing ring 23 are provided between the current transformer housing and the transition housing 7. The inner diameter of the main sealing ring is larger than the outer diameter of the auxiliary sealing ring, forming a double sealing structure to reduce the leakage rate. All other mating surfaces are also provided with a double sealing structure of the main sealing ring 22 and the auxiliary sealing ring 23.

[0033] The bottom of the first insulating basin is fixedly connected to a first conductive connector 2. The first conductive connector 2 is fixedly connected to a first conductor 6 that passes downward through the inner cavity of the expansion joint and the inner cavity of the current transformer. The first conductor and the first conductive connector are fixedly connected by threads. The lower end of the first conductor 6 extends to the inner cavity of the transition housing and is fixedly connected to a second conductor 11 through a connecting conductor 9. The connecting conductor 9 is detachably fixed to the first conductor 6 and the second conductor 11 respectively. The second conductor 11 extends downward to the contact seat 18 of the circuit breaker unit 17 and is inserted into the contact seat.

[0034] Specifically, in this embodiment, a sleeve coaxial with the second conductor is fixed on the contact seat of the circuit breaker unit. The second conductor passes through the inner hole of the sleeve and is connected to the sleeve via a conductive spring 19. The conductive spring is disposed in the inner hole of the sleeve, and the second conductor passes through the inner hole of the conductive spring and contacts the conductive spring to ensure conductivity and current flow. The inner hole of the sleeve is also provided with a guide ring 20 sleeved on the second conductor. The conductive spring 19 and the guide ring 20 together provide guidance for the movement of the second conductor. The guide ring is made of wear-resistant and low-deformation polytetrafluoroethylene material, and the conductive spring is made of chromium zirconium copper material with better current flow and is silver-plated on the surface.

[0035] The first conductor 6 includes a first cylindrical body and a connector I8 fixed to the lower end of the first cylindrical body. The second conductor 11 includes a second cylindrical body and a connector II fixed to the upper end of the second cylindrical body. For ease of processing, connector I8 is welded and sealed to the first cylindrical body, and connector II is welded and sealed to the second cylindrical body. The first cylindrical body, connector I8, connecting conductor, second cylindrical body, and connector II are coaxially arranged. The top surface of the connecting conductor is in contact with the bottom surface of connector I, and the bottom surface of the connecting conductor is in contact with the top surface of connector II. The connecting conductor is fixed to connector I and connector II respectively by connecting bolts extending vertically. The side of the connecting conductor is provided with a groove adapted to the connecting bolt, providing space for installing the connecting bolt.

[0036] Both the first and second cylinders are hollow structures. Connector I, connector II, and connecting conductors are all provided with vertically penetrating inner holes. The inner cavities of the first and second cylinders are connected through the inner holes of connector I, connector II, and connecting conductors. Ventilation holes are provided on the side walls of the first and second cylinders to facilitate gas flow.

[0037] The inner holes of connector I, connector II, and connecting conductor are coaxial. The upper and lower ends of the connecting conductor are respectively fixed with positioning bosses extending into the inner holes of connector I and connector II to better ensure coaxiality.

[0038] A shielding cylinder 10 is fitted onto the connecting conductor. The shielding cylinder extends upwards above the contact point between the first conductor and the connecting conductor, and downwards below the contact point between the second conductor and the connecting conductor. The shielding cylinder, the connecting conductor, the first conductor, and the second conductor are all clearance-fitted to facilitate vertical movement of the shielding cylinder. A fastening bolt, reaching the connecting conductor, passes through the side wall of the shielding cylinder. The fastening bolt is threaded to the side wall of the shielding cylinder. The side of the connecting conductor has a threaded hole adapted to the fastening bolt. The inner ends of the shielding cylinder 10 are rounded to prevent scratching the surfaces of the first and second conductors during vertical movement.

[0039] The transition housing has a first opening on its side wall, and a cover plate 21 is detachably fixed to the first opening. The first opening is opposite to the connecting conductor, facilitating the installation and removal of the connecting conductor. The transition housing also has a second opening opposite to the first opening on its side wall, and a cover plate is also detachably fixed to the second opening.

[0040] The expansion joint 4 includes an expansion cylinder, flange plates fixed to the upper and lower ends of the expansion cylinder, and a plurality of screws passing vertically through the upper and lower flange plates. The flange plates have flange holes coaxial with the inner bore of the expansion cylinder. Adjusting nuts are threaded onto the screws, located on the upper and lower sides of the upper flange plate and the lower flange plate, respectively. In this embodiment, the expansion cylinder uses a bellows to ensure good expansion and contraction characteristics. The screws in this embodiment are double-ended studs, evenly distributed circumferentially. The compression of the expansion joint can be adjusted by turning the adjusting nuts.

[0041] The bottom of the transition housing is fixed with a lower connecting flange, and the top of the four-way housing of the circuit breaker unit is fixed with an upper connecting flange. The lower connecting flange and the upper connecting flange are fixed together by bolts, and a sealing ring is provided between the lower connecting flange and the upper connecting flange.

[0042] The bottom of the four-way housing of the circuit breaker unit has a shielding pit located below the contact seat of the circuit breaker unit, which is used to collect any metal foreign objects that may fall during disassembly, and acts as a particle trap.

[0043] The circuit breaker unit 17 is mounted on a movable base frame 16, ensuring that the detachable busbar CT module can move together with the circuit breaker unit 17. Simultaneously, the movable circuit breaker base frame facilitates rapid maintenance and replacement of the circuit breaker and other modules. Support legs 15 supporting the four-way housing 12 are fixed on the base frame 16. Connecting flanges are fixed to the four ports of the four-way housing 12. The top connecting flange is bolted to the flange fixed at the lower end of the transition housing. The bottom connecting flange is bolted to a support beam 14, which is supported on the top of the support legs. An end plate is bolted to the right connecting flange, and the left flange is bolted to the three-way housing of the circuit breaker. In this embodiment, a vertical second insulating basin 25 is provided between the left connecting flange of the four-way housing and the connecting flange of the three-way housing. A second conductive connector 24 located inside the four-way housing 12 is fixed to the second insulating basin 25. The contact seat 18 is bolted to the second conductive connector. A shielding cover 13 is provided on the contact base 18 to improve the electric field distribution between the high potential and the low potential of the housing. By setting a vertical second insulating basin, the risk of metal foreign objects mixed in during disassembly is avoided from contaminating the surface of the insulating basin.

[0044] The first insulating basin 1, the first conductive joint 2, the first conductor 6, the connecting conductor 9, the second conductor, the contact seat 18, the second conductive joint 24, and the second insulating basin constitute a conductive circuit. Both the first and second conductive joints are equipped with shielding rings 3 to shield the sharp corners of the bolts, ensuring a uniform electric field on the insulating basin side. The first insulating basin 1, the expansion joint 4, the current transformer housing, the transition housing 7, the four-way housing 12, and the second insulating basin 25 constitute a sealed system.

[0045] When rapid maintenance is required, quickly release the gas pressure in the detachable bus CT module to zero. Open the covers 21 on both sides of the transition housing 7, loosen the fastening bolts on the shielding cylinder 10, move the shielding cylinder downwards to expose the connecting conductor 9, then remove the connecting bolts between the connecting conductor 9 and the first conductor 6 and the second conductor 11, press down on the second conductor 11, and remove the connecting conductor 9 through the pull hole of the transition housing 7. Then, shake the shielding cylinder 10 and the second conductor 11 out of the contact seat 18 and remove them through the pull hole of the transition housing 7. Finally, remove the connecting bolts between the transition housing 7 and the four-way housing 12, compress the expansion joint 4 upwards, and move the transition housing and the current transformer upwards, so that a gap appears at the mating position of the transition housing 7 and the four-way housing 12. The four-way housing 12 and its internal and external connecting parts, along with the circuit breaker unit 17, can be moved out of the entire bay modularly with the movable base frame 16 to complete rapid maintenance or replacement.

[0046] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A detachable busbar CT module suitable for rapid GIS maintenance, comprising a current transformer (5), characterized in that: It also includes a transition housing (7) fixed to the bottom of the current transformer housing, and an expansion joint (4) fixed to the top of the current transformer housing. The top of the expansion joint is fixed with a first insulating basin (1), and the bottom of the first insulating basin is fixed with a first conductive joint (2). The first conductive joint (2) is fixed with a first conductor (6) that passes downward through the inner cavity of the expansion joint and the inner cavity of the current transformer. The lower end of the first conductor (6) extends to the inner cavity of the transition housing and is fixed with a second conductor (11) through a connecting conductor (9). The connecting conductor (9) is detachably fixed with the first conductor (6) and the second conductor (11) respectively. The second conductor (11) extends downward to the contact seat (18) of the circuit breaker unit (17). The bottom of the transition housing (7) is detachably fixed to the four-way housing (12) of the circuit breaker unit. The side wall of the transition housing is provided with a first pull-out, and a cover plate (21) is detachably fixed to the first pull-out.

2. The detachable busbar CT module for rapid GIS maintenance according to claim 1, characterized in that: The first conductor (6) includes a first cylinder and a connector I (8) fixed to the lower end of the first cylinder. The second conductor (11) includes a second cylinder and a connector II fixed to the upper end of the second cylinder. The top surface of the connecting conductor is in contact with the bottom surface of the connector I, and the bottom surface of the connecting conductor is in contact with the top surface of the connector II. The connecting conductor is fixed to the connector I and the connector II respectively by connecting bolts extending vertically. The side of the connecting conductor is provided with a groove that is adapted to the connecting bolt.

3. A detachable busbar CT module suitable for rapid GIS maintenance according to claim 2, characterized in that: The connector I, connector II, and connecting conductor are all provided with vertically penetrating inner holes. The inner cavities of the first cylinder and the second cylinder are connected through the inner holes of connector I, connector II, and connecting conductor. Ventilation holes are provided on the side walls of the first cylinder and the second cylinder, respectively.

4. A detachable busbar CT module suitable for rapid GIS maintenance according to claim 1, characterized in that: A shielding cylinder (10) is fitted on the connecting conductor. The shielding cylinder extends upward to above the contact position between the first conductor and the connecting conductor, and downward to below the contact position between the second conductor and the connecting conductor. A fastening bolt that reaches the connecting conductor is inserted through the side wall of the shielding cylinder. The fastening bolt is connected to the side wall of the shielding cylinder by a thread.

5. A detachable busbar CT module suitable for rapid GIS maintenance according to claim 4, characterized in that: The inner ends of the shielding cylinder (10) are respectively provided with rounded chamfers.

6. A detachable busbar CT module for rapid GIS maintenance according to claim 1, characterized in that: The expansion joint (4) includes an expansion cylinder, flange plates fixed to the upper and lower ends of the expansion cylinder, and a number of screws passing through the upper and lower flange plates vertically. The flange plates have flange holes coaxial with the inner hole of the expansion cylinder. The screws are threadedly connected to adjusting nuts located on the upper and lower sides of the upper flange plate and adjusting nuts located on the lower flange plate.

7. A detachable busbar CT module suitable for rapid GIS maintenance according to claim 1, characterized in that: A sleeve coaxial with the second conductor is fixed on the contact seat of the circuit breaker unit. The second conductor passes through the inner hole of the sleeve and is connected to the sleeve by a conductive spring (19).

8. A detachable busbar CT module for rapid GIS maintenance according to claim 1, characterized in that: The bottom of the transition housing is fixed with a lower connecting flange, and the top of the four-way housing of the circuit breaker unit is fixed with an upper connecting flange. The lower connecting flange and the upper connecting flange are fixed together by bolts, and a sealing ring is provided between the lower connecting flange and the upper connecting flange.

9. A detachable busbar CT module suitable for rapid GIS maintenance according to claim 1 or 8, characterized in that: The bottom of the four-way housing of the circuit breaker unit has a shielding pit located below the contact seat of the circuit breaker unit.

10. A detachable busbar CT module for rapid GIS maintenance according to claim 1, characterized in that: The side wall of the transition housing is also provided with a second opening opposite to the first opening, and a cover plate can also be detachably fixed to the second opening.

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