GIS bus shunt compensation type expansion joint

Abstract

The utility model relates to a GIS busbar parallel compensation type expansion joint belongs to high pressure switch technical field. The both ends of busbar shell are connected with basin type insulator respectively, and the busbar shell is connected with basin type insulator through expansion joint, and the connecting place of expansion joint is equipped with flange, and the flange of both sides of each expansion joint is connected through soft copper band, and the outside flange of expansion joint of both ends of busbar shell is locked through nut and steel draw bar. The both ends basin type insulator outside connection is compensated busbar, and the both ends basin type insulator inside connection is a shield, and conductor and shield leave a certain gap, and the conductor can slide in two shield. The GIS busbar parallel compensation type expansion joint can absorb the axial displacement of compensated busbar in the angle of internal conductor allowable deflection.

Description

Technical Field

[0001] This utility model relates to a parallel compensation expansion joint for GIS busbars, belonging to the field of high-voltage switch technology. Background Technology

[0002] As a core component of high-voltage power transmission and distribution systems, GIS (Gas Insulated Switchgear) equipment requires its busbars to withstand complex mechanical stresses caused by temperature changes, short-circuit electrodynamics, foundation settlement, and mechanical vibration. Since GIS relies on gas insulation, busbar displacement or deformation directly impacts connection points such as flanges and sealing rings, leading to gas leakage, reduced insulation performance, and deformation of basin insulators, conductors, and shielding covers. It can also cause abnormal gaps between conductors and shielding covers, inducing partial discharge. Traditional single-type compensators offer good axial compensation performance but weak radial compensation performance. With the gradual improvement of power grids, the operating conditions of GIS busbars are becoming increasingly complex, leading to the widespread application of long busbars. This invention primarily discloses a parallel-compensation expansion joint for GIS busbars, which can absorb the axial displacement of the compensated busbar within the allowable deflection angle of the internal conductor. Summary of the Invention

[0003] To solve the above problems, the specific technical solution of this utility model is as follows:

[0004] A GIS busbar parallel compensation type expansion joint has expansion joints 2 connected to both ends of the busbar shell 1. The flanges on both sides of the expansion joint 2 are connected by soft copper strips 5. The two ends of the expansion joint 2 are connected to pot-type insulators 3. The outer flanges of the two expansion joints are locked to the limit rods 4 by nuts 9. The spherical washer group 8 acts as a guide shaft for the rigidity of the rods 4. The outer side of the pot-type insulators 3 at both ends is connected to the busbar that needs temperature compensation. The inner side of the pot-type insulators 3 at both ends is connected to a shield 6. The conductor 7 and the shield 6 have a certain gap, and the conductor 7 can slide and deflect within the two shield 6. Attached Figure Description

[0005] Figure 1 This is a front view of a GIS busbar parallel compensation expansion joint.

[0006] Figure 2 This is a front view of a GIS busbar parallel compensation expansion joint.

[0007] Figure 3 This is a side view of a GIS busbar parallel compensation expansion joint.

[0008] Figure 4 This refers to the operating conditions of the parallel compensation expansion joint for GIS busbars.

[0009] Figure 5 This is a diagram illustrating the compensation principle of a parallel compensation type expansion joint for GIS busbars.

[0010] The attached diagram is labeled as follows: 1-Busbar casing, 2-Expansion joint, 3-Pot insulator, 4-Rigid tie rod, 5-Soft copper strip, 6-Shielding cover, 7-Conductor, 8-Spherical washer, 9-Nut, 10-Compensated busbar, 11-Connecting busbar, 12-Parallel compensation type expansion joint. Detailed Implementation

[0011] The invention will be further explained below with reference to the accompanying drawings.

[0012] This invention provides a novel busbar compensation device, such as... Figure 1 As shown, this compensation device can absorb the axial displacement of the connected busbar 11 through its own deformation. See the operating conditions for details. Figure 4 .

[0013] like Figure 2 The device mainly consists of a busbar section, two expansion joints 2, and a set of evenly distributed limiting rods 4. The expansion joints 2 are symmetrically arranged on both sides of the busbar. A basin-type insulator 3 is installed on the outer side of the expansion joint 2. The flanges on both sides of the expansion joint 2 are connected by a flexible copper strip 5 to achieve equipotential bonding. The flexible copper strip 5 allows for flexible deformation with the device. The limiting rods 4 pass through the mounting holes of the flanges of the expansion joint 2. Figure 3 As shown, the limiting rod 4 has threads on both sides and is fastened to the outer flanges of the expansion joints at both ends by a set of spherical washers 8 and nuts 9. The spherical washers 8 provide axial guidance for the limiting rod 4. A basin-type insulator 3 is provided on the outer side of the expansion joint 2. A shielding cover 6 is provided inside the basin-type insulator 3. A certain gap is left between the conductor 7 and the shielding cover 6. When this parallel compensation expansion joint 12 deforms, the conductor 7 and the shielding cover 6 adopt a double-end plug-in connection, allowing the conductor 7 to slide and deflect within the shielding cover 6, with a maximum allowable deflection angle θ. A set of evenly distributed limiting rods 4 can uniformly absorb the axial mechanical stress from the compensated busbar 10 and provide axial guidance for this parallel compensation expansion joint 12, while also enhancing the strength of this compensation device.

[0014] The theoretical maximum compensation length L = H × tanθ, where θ is the theoretical maximum deflection angle of the conductor, and H is the theoretical installation state of the compensation expansion joint. A simplified diagram of the compensation theory can be found here. Figure 5 .

Claims

1. A GIS busbar parallel compensation type expansion joint, wherein both ends of the busbar shell (1) are respectively connected to a basin-type insulator (3), characterized in that: The busbar casing (1) is connected to the basin insulator (3) via an expansion joint (2). The expansion joint (2) is provided with a flange at the connection point. The flanges on both sides of each expansion joint (2) are connected by a soft copper strip (5).

2. The GIS busbar parallel compensation expansion joint according to claim 1, characterized in that, The outer flanges of the expansion joints at both ends of the busbar housing (1) are locked to the rigid tie rod (4) by nuts.

3. The GIS busbar parallel compensation expansion joint according to claim 2, characterized in that, The rigid tie rod (4) has threads at both ends and is fastened to the outer flange of the expansion joint by a spherical washer (8) and a nut (9).

4. The GIS busbar parallel compensation expansion joint according to claim 1, characterized in that, The outer side of the two-end basin insulator (3) is connected to the busbar to be compensated, and the inner side of the two-end basin insulator (3) is connected to a shield (6). The conductor (7) and the shield (6) have a certain gap, and the conductor (7) can slide inside the two shields (6).

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