A commutation bus of a GIS

Abstract

This utility model discloses a commutation busbar for GIS (Gas-Insulated Switchgear), comprising a housing, two basin-type insulators, and six L-shaped conductors. Different combinations of L-shaped conductors are used to achieve different connection methods between the first and second basin-type insulators. The connection methods include: 1) the first R terminal is connected to the second R terminal via the first L-shaped conductor, the first S terminal is connected to the second S terminal via the second L-shaped conductor, and the first T terminal is connected to the second T terminal via the third L-shaped conductor; 2) the first R terminal is connected to the second R terminal via the fourth L-shaped conductor, the first S terminal is connected to the second T terminal via the fifth L-shaped conductor, and the first T terminal is connected to the second S terminal via the sixth L-shaped conductor. The commutation busbar of this utility model has a simple structure, occupies little space, and has high assembly efficiency.

Description

Technical Field

[0001] This utility model relates to gas-insulated switchgear, and more particularly to a commutation busbar for GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) consists of circuit breakers, disconnecting switches, grounding switches, current transformers, voltage transformers, surge arresters, busbars, etc. The advantages of GIS are its compact structure, flexible configuration, and convenient installation.

[0003] The commutation busbar is a crucial component of a GIS system, primarily responsible for the conversion and connection of current between different phases. Also known as an "interphase busbar" or "commutation conductor," the commutation busbar is a conductive component in a GIS used to connect the electrical paths between different phases (A-phase, B-phase, and C-phase). It is typically made of highly conductive metallic materials and sealed in an SF6 (sulfur hexafluoride) gas-insulated enclosure. In a GIS system, three-phase currents need to be transmitted and distributed through different paths. The commutation busbar acts as a bridge, connecting the currents of different phases to the corresponding circuit breakers, disconnectors, or other equipment. In some GIS structures, the commutation busbar can switch between phases A and B to meet the needs of different operating modes.

[0004] Utility model application CN201420072015.4 discloses a main busbar combination phase-commutation structure for GIS bays, including a bay positive busbar, which includes a positive busbar shell. One end of the positive busbar shell is provided with a positive busbar basin-type insulator. The bay positive busbar is provided with T-phase interfaces, S-phase interfaces, and R-phase interfaces, which are fixedly connected to the T-phase interfaces, S-phase interfaces, and R-phase interfaces on the conductor inserts located inside the positive busbar basin-type insulator via conductors. A bay negative busbar is also disclosed, including a negative busbar shell. One end of the negative busbar shell is provided with a negative busbar basin-type insulator. The negative busbar is provided with T-phase interfaces, S-phase interfaces, and R-phase interfaces, which are fixedly connected to the T-phase interfaces, S-phase interfaces, and R-phase interfaces on the conductor inserts located inside the negative busbar basin-type insulator via conductors. Phase commutation is achieved through the bay positive and negative busbars.

[0005] The main drawbacks of this utility model are as follows: 1) Complex structure and low assembly efficiency: It requires the cooperation of two sets of structures, positive busbar and reverse busbar, to complete the phase commutation, which increases the number of parts and assembly steps, resulting in time-consuming installation and a high risk of errors. 2) Reliance on box-type insulators for connection, fixed phase commutation position, and poor flexibility. 3) Large space occupation: Due to the use of double busbar combination, the overall structure occupies a large longitudinal space, which is not conducive to the miniaturization design of GIS equipment. 4) Fixed phase commutation logic and poor versatility: The phase commutation path of the conductor depends on the preset spatial cross arrangement, which only supports specific phase exchange methods (such as T→S→R) and cannot adapt to different phase commutation requirements. If the phase commutation sequence needs to be adjusted, the busbar structure must be redesigned, which lacks flexibility. 5) Uneven electric field distribution: Using straight conductors or simply bent conductors, electric field concentration (such as sharp-angle discharge) is easily generated at the phase commutation connection, which affects the insulation performance. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a commutation busbar for GIS with a simple structure and small space occupation.

[0007] To solve the above-mentioned technical problems, the present invention adopts a GIS phase-changing busbar, comprising a housing, two basin-type insulators, and six L-shaped conductors. The first basin-type insulator includes three terminals: a first R terminal, a first S terminal, and a first T terminal. The second basin-type insulator also includes three terminals: a second R terminal, a second S terminal, and a second T terminal. The housing includes three annular connecting flanges, with the axis of the first connecting flange orthogonal to the axis of the second connecting flange. The flange of the first basin-type insulator is detachably mounted on the first connecting flange, and the flange of the second basin-type insulator is detachably mounted on the second connecting flange. Different combinations of L-shaped conductors are used to achieve different connection methods between the first and second basin-type insulators, including: 1) The first R terminal is connected to the second R terminal through the first L-shaped conductor, the first S terminal is connected to the second S terminal through the second L-shaped conductor, and the first T terminal is connected to the second T terminal through the third L-shaped conductor; 2) The first R terminal is connected to the second R terminal through the fourth L-shaped conductor, the first S terminal is connected to the second T terminal through the fifth L-shaped conductor, and the first T terminal is connected to the second S terminal through the sixth L-shaped conductor.

[0008] The L-shaped conductor of the GIS phase-changing busbar described above includes a horizontal bar, a vertical bar, and a corner connector. The corner connector includes two ball heads. The first ball head of the corner connector is connected to the first end of the horizontal bar by a screw, and the second end of the horizontal bar is connected to the corresponding terminal on the first basin-type insulator by a screw. The second ball head of the corner connector is connected to the upper end of the vertical bar by a screw, and the lower end of the vertical bar is connected to the corresponding terminal on the second basin-type insulator by a screw.

[0009] In the GIS phase-changing busbar described above, the three terminals of the first basin-type insulator are arranged in an equilateral triangle, with the first S terminal positioned directly above the first T terminal; the three terminals of the second basin-type insulator are also arranged in an equilateral triangle, with the line connecting the second R terminal and the second T terminal orthogonal to the axis of the crossbar; in connection method 1, along the axis of the crossbar, the second R terminal and the second T terminal are closer to the first basin-type insulator, while the second S terminal is farther away from the first basin-type insulator; in connection method 2, along the axis of the crossbar, the second R terminal and the second T terminal are farther away from the first basin-type insulator, while the second S terminal is closer to the first basin-type insulator.

[0010] In the GIS phase bus described above, the first L-shaped conductor and the fourth L-shaped conductor share the same first corner connector, the second L-shaped conductor and the sixth L-shaped conductor 30F share the same second corner connector, and the third L-shaped conductor and the fifth L-shaped conductor can share the same third corner connector.

[0011] The GIS commutation busbar structure of this utility model is simple, occupies little space, and has high assembly efficiency. Two commutation modes can be realized with a single shell and 6 L-shaped conductors. Phase switching is completed by changing the conductor combination. The redundant reverse busbar module is eliminated, the number of connection points is reduced, and the assembly efficiency is significantly improved. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a front view of the phase-changing bus of the GIS in Embodiment 1 of this utility model.

[0014] Figure 2 This is a left view of the phase-changing busbar of the GIS in Embodiment 1 of this utility model.

[0015] Figure 3 This is a right view of the commutation bus of the GIS according to Embodiment 1 of this utility model.

[0016] Figure 4 This is a bottom view of the phase-changing busbar of the GIS in Embodiment 1 of this utility model.

[0017] Figure 5This is a front view of the phase-switching busbar of the GIS according to Embodiment 1 of this utility model, after the casing has been removed.

[0018] Figure 6 This is a top view of the phase-switching busbar of the GIS according to Embodiment 1 of this utility model, after the casing has been removed.

[0019] Figure 7 This is a perspective view of the phase-changing busbar of the GIS according to Embodiment 1 of this utility model, with the casing removed.

[0020] Figure 8 This is a left view of the phase-changing busbar of the GIS in Embodiment 2 of this utility model.

[0021] Figure 9 This is a bottom view of the phase-changing busbar of the GIS in Embodiment 2 of this utility model.

[0022] Figure 10 This is a front view of the phase-changing busbar of the GIS according to Embodiment 2 of this utility model, after the casing has been removed.

[0023] Figure 11 This is a left view of the phase-changing busbar of the GIS according to Embodiment 2 of this utility model, after the casing has been removed.

[0024] Figure 12 This is a top view of the phase-changing busbar of the GIS according to Embodiment 2 of this utility model, after the shell has been removed.

[0025] Figure 13 This is a bottom view of the phase-changing busbar of the GIS in Embodiment 2 of this utility model, with the casing removed.

[0026] Figure 14 This is a perspective view of the phase-changing busbar of the GIS according to Embodiment 2 of this utility model, after removing the casing.

[0027] Figure 15 This is a front view of the first corner connector of this utility model embodiment.

[0028] Figure 16 This is a perspective view of the first corner connector of this utility model embodiment.

[0029] Figure 17 This is a front view of the second corner connector in an embodiment of this utility model.

[0030] Figure 18 This is a perspective view of the second corner connector in an embodiment of this utility model.

[0031] Figure 19 This is a front view of the third corner connector in an embodiment of this utility model.

[0032] Figure 20 This is a perspective view of the third corner connector of this utility model embodiment. Detailed Implementation

[0033] The structure of the commutation busbar of the GIS in Embodiment 1 of this utility model is as follows: Figures 1 to 7 As shown, the system includes a housing 10, two basin-type insulators 20, and three L-shaped conductors 30. The first basin-type insulator 20A includes three terminals: a first R terminal R1, a first S terminal S1, and a first T terminal T1. The second basin-type insulator 20B also includes three terminals: a second R terminal R2, a second S terminal S2, and a second T terminal T2. The housing 10 has a T-shaped tee structure, including three annular connecting flanges 11. The axis of the first connecting flange 11A is orthogonal to the axis of the second connecting flange 11B. The third connecting flange 11C is used to install a cover for the working port of the housing 10. The flange 20A1 of the first basin-type insulator 20A is detachably mounted on the first connecting flange 11A by screws, and the flange 20B1 of the second basin-type insulator 20B is detachably mounted on the second connecting flange 11B by screws.

[0034] like Figures 1 to 7 As shown, this embodiment is the first connection method of the phase switching bus of GIS: the first R terminal R1 is connected to the second R terminal R2 through the first L-shaped conductor 30A, the first S terminal S1 is connected to the second S terminal S2 through the second L-shaped conductor 30B, and the first T terminal T1 is connected to the second T terminal T2 through the third L-shaped conductor 30C.

[0035] The L-shaped conductor 30 includes a horizontal bar 31, a vertical bar 32, and a corner connector 33. The corner connector 33 includes two ball heads. The first ball head 331 of the corner connector 33 is connected to the first end of the horizontal bar 31 by a screw, and the second end of the horizontal bar 31 is connected to the corresponding terminal on the first basin-type insulator 20A by a screw. The second ball head 332 of the corner connector 33 is connected to the upper end of the vertical bar 32 by a screw, and the lower end of the vertical bar 32 is connected to the corresponding terminal on the second basin-type insulator 20B by a screw.

[0036] In the structure of the commutation busbar of the GIS in Embodiment 1 of this utility model, the three terminals of the first basin-type insulator 20A are arranged in an equilateral triangle, with the first S terminal S1 positioned directly above the first T terminal T1. Similarly, the three terminals of the second basin-type insulator 20B are arranged in an equilateral triangle, with the line connecting the second R terminal R2 and the second T terminal T2 orthogonal to the axis of the crossbar 31. Along the axis of the crossbar 31, the second R terminal R2 and the second T terminal T2 are closer to the first basin-type insulator 20A, while the second S terminal S2 is farther away from the first basin-type insulator 20A.

[0037] The structure of the commutation busbar of the GIS in Embodiment 2 of this utility model is as follows: Figures 8 to 14 As shown, the structure of Embodiment 2 is basically the same as that of Embodiment 1, the main difference being the connection method. This embodiment is the second connection method of the commutation bus of GIS: that is, the first R terminal R1 is connected to the second R terminal R2 through the fourth L-shaped conductor 30D, the first S terminal S1 is connected to the second T terminal T2 through the fifth L-shaped conductor 30E, and the first T terminal T1 is connected to the second S terminal S2 through the sixth L-shaped conductor 30F.

[0038] In Embodiment 2, the line connecting the second R terminal R2 and the second T terminal T2 is orthogonal to the axial direction of the crossbar 31. Along the axial direction of the crossbar 31, the second R terminal R2 and the second T terminal T2 are away from the first basin-type insulator 20A, and the second S terminal S2 is close to the first basin-type insulator 20A. The arrangement of the terminals in Embodiment 2 can be achieved by rotating the second basin-type insulator 20B by 60° or 180°.

[0039] Example 2 and Example 1 use different combinations of L-shaped conductors 30 to achieve different connection methods between the first basin insulator 20A and the second basin insulator 20B. The horizontal and vertical bars of the three L-shaped conductors 30 in Example 2 are different in length from those in Example 1.

[0040] The first L-shaped conductor 30A of Embodiment 1 and the fourth L-shaped conductor 30D of Embodiment 2 can share the same first corner connector 33A; the second L-shaped conductor 30B of Embodiment 1 and the sixth L-shaped conductor 30F of Embodiment 2 can share the same second corner connector 33B; and the third L-shaped conductor 30C of Embodiment 1 and the fifth L-shaped conductor 30E of Embodiment 2 can share the same third corner connector 33C. The shape of the first corner connector 33A is as follows: Figure 15 and 16 As shown, the shape of the second corner connector 33B is as follows: Figure 17 and 18 As shown, the shape of the third corner connector 33C is as follows: Figure 19 and 20 As shown.

[0041] The commutation busbar of the GIS in the above embodiments of this utility model has the following beneficial effects: 1. Simplified structure and improved assembly efficiency: Two commutation modes can be achieved with a single shell and 6 L-shaped conductors. Phase switching is completed by changing the conductor combination. The redundant reverse bus module is eliminated, reducing connection points by more than 50% and significantly improving assembly efficiency.

[0042] 2. Space optimization: The commutation conductors are directly arranged in the corner space of the L-shaped shell without the need for additional transition modules, resulting in a more compact overall structure.

[0043] 3. Enhanced commutation flexibility and versatility: Two commutation modes are supported through different combinations of 6 L-shaped conductors: the same housing structure can adapt to different operating conditions without modifying the busbar itself.

[0044] 4. Electric Field Distribution and Insulation Performance Optimization: The corner connectors of the L-shaped conductors employ a ball-head design to naturally homogenize the electric field and reduce the risk of partial discharge. The spatial arrangement of the conductors optimizes the interphase insulation distance through the distribution of equilateral triangular terminals.

[0045] 5. Cost control and ease of maintenance: Modular L-shaped conductor: Switching between commutation modes only requires replacing the conductor, reducing spare parts inventory pressure. Detachable screw connections facilitate quick on-site replacement or maintenance, minimizing downtime.

Claims

1. A commutation busbar for a GIS (Gas-Insulated Gate System), comprising a housing and two basin-type insulators, wherein the first basin-type insulator includes three terminals, namely a first R terminal, a first S terminal, and a first T terminal; the second basin-type insulator includes three terminals, namely a second R terminal, a second S terminal, and a second T terminal, characterized in that, It includes 6 L-shaped conductors, and the housing includes three annular connecting flanges, the axis of the first connecting flange being orthogonal to the axis of the second connecting flange; the flange of the first basin insulator is detachably mounted on the first connecting flange, and the flange of the second basin insulator is detachably mounted on the second connecting flange; Different combinations of L-shaped conductors are used to achieve different connection methods between the first basin-type insulator and the second basin-type insulator, the connection methods including: 1) The first R terminal is connected to the second R terminal through the first L-shaped conductor, the first S terminal is connected to the second S terminal through the second L-shaped conductor, and the first T terminal is connected to the second T terminal through the third L-shaped conductor; 2) The first R terminal is connected to the second R terminal through the fourth L-shaped conductor, the first S terminal is connected to the second T terminal through the fifth L-shaped conductor, and the first T terminal is connected to the second S terminal through the sixth L-shaped conductor; The L-shaped conductor includes a horizontal bar, a vertical bar, and a corner connector. The corner connector includes two ball heads. The first ball head of the corner connector is connected to the first end of the horizontal bar by a screw, and the second end of the horizontal bar is connected to the corresponding terminal on the first basin insulator by a screw. The second ball head of the corner connector is connected to the upper end of the vertical bar by a screw, and the lower end of the vertical bar is connected to the corresponding terminal on the second basin insulator by a screw. The three terminals of the first basin-type insulator are arranged in an equilateral triangle, with the first S terminal positioned directly above the first T terminal. The three terminals of the second basin-type insulator are also arranged in an equilateral triangle, with the line connecting the second R terminal and the second T terminal perpendicular to the axis of the crossbar. In connection method 1, along the axis of the crossbar, the second R terminal and the second T terminal are closer to the first basin-type insulator, while the second S terminal is farther away from the first basin-type insulator. In connection method 2, along the axis of the crossbar, the second R terminal and the second T terminal are farther away from the first basin-type insulator, while the second S terminal is closer to the first basin-type insulator. The first L-shaped conductor and the fourth L-shaped conductor share the same first corner connector, the second L-shaped conductor and the sixth L-shaped conductor share the same second corner connector, and the third L-shaped conductor and the fifth L-shaped conductor share the same third corner connector.

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