A contact seat structure for 110kv GIS independent gas chamber current transformer

Abstract

The utility model relates to high -voltage electrical equipment field especially relates to a 110kVGIS independent gas chamber current transformer contact seat structure. It includes seat body, seat body is set up by eccentric structure of front end and rear end, the front end of seat body is provided with the conductor installation cavity of connecting conductor, the front end of conductor installation cavity is provided with the guide groove for installing polytetrafluoroethylene material guide ring, the rear end of conductor installation cavity sets up the conductive spring groove for installing conductive spring, the rear end of seat body is equipped with four groups of mounting holes, one group of mounting holes is through the rear end of seat body and is communicated conductor installation cavity, and the rest three groups of bolt mounting holes are exposed at the outside of seat body and are set up as sunken platform structure, seat body adopts cast aluminium alloy material, the utility model discloses cast aluminium alloy material, through the reasonable design bolt fixed hole position size, guarantees the cross -sectional area of minimum cross section to meet the through -flow 3465A requirement.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment, and in particular to a contact seat structure for a 110kV GIS independent gas chamber current transformer. Background Technology

[0002] As a key component connecting current transformers and conductors in GIS equipment, the quality of its structural design and material selection directly affects the equipment's current-carrying capacity, insulation performance, and manufacturing cost. In high-voltage power grids of 110kV and above, to ensure stable system operation, the contact base must be able to safely and reliably carry thousands of amperes of rated current while possessing excellent electric field distribution to suppress partial discharge. Traditional copper materials or staggered contact structures can meet basic electrical performance requirements, but their high material costs or complex processing techniques have become bottlenecks restricting product economics and market competitiveness. Therefore, developing a contact base structure that significantly reduces manufacturing costs while ensuring equal or even better electrical performance is of significant practical engineering importance for promoting technological advancements and cost control in high-voltage switchgear.

[0003] Existing technologies generally have shortcomings. First, contact seats manufactured from integral copper forgings have extremely high raw material costs and low material utilization during processing, resulting in high final product costs. Second, whether using a large number of spring-loaded contact fingers or a staggered contact structure, the common drawback is their relatively complex structure, requiring stringent precision in component machining and assembly processes, which further increases production and maintenance costs. Furthermore, traditional symmetrical structural designs, within the limited space of the GIS air chamber, struggle to effectively increase the phase-to-phase distance, limiting further improvements in electric field optimization capabilities. These factors collectively highlight the limitations of existing solutions in terms of economic efficiency and design optimization potential. Utility Model Content

[0004] To address the problems existing in the background technology, a contact seat structure for a 110kV GIS independent gas chamber current transformer is proposed. It is made of cast aluminum alloy and the cross-sectional area at the minimum cross-section meets the requirement of 3465A current carrying capacity by reasonably designing the position and size of the bolt fixing holes.

[0005] This utility model proposes a contact seat structure for a 110kV GIS independent gas chamber current transformer, including a seat body, which is configured as an eccentric structure consisting of a front end and a rear end; the front end of the seat body is provided with a conductor mounting cavity for connecting a conductor; the front end of the conductor mounting cavity is provided with a guide groove for installing a polytetrafluoroethylene guide ring, and the rear end of the conductor mounting cavity is provided with a conductive spring groove for installing a conductive spring; the rear end of the seat body is provided with four sets of mounting holes, one set of mounting holes penetrating the rear end of the seat body and communicating with the conductor mounting cavity, and the other three sets of bolt mounting holes are exposed on the outside of the seat body and are configured as a countersunk structure; the seat body is made of cast aluminum alloy.

[0006] Preferably, the inner wall of the conductive spring groove is provided with a 10µm electroplated silver layer, and a vent hole is also provided to connect the conductor mounting cavity.

[0007] Preferably, the front end and rear end portions of the base are provided with multi-radius arcs.

[0008] Preferably, the opening of the conductor mounting cavity is provided with an angle.

[0009] Preferably, the three sets of bolt mounting holes are provided with embedded beveled mounting slots.

[0010] Preferably, the rear end of the base is provided with a stop structure that surrounds the four sets of mounting holes.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects: The contact seat structure for the 110kV GIS independent gas chamber current transformer proposed in this utility model, through the adoption of an eccentric design, effectively increases the phase spacing between the three-phase conductors, thereby significantly reducing the electric field strength and minimizing the risk of partial discharge. Simultaneously, the multi-radius arc at the front end of the seat further optimizes the surface electric field distribution, avoiding electric field concentration. Furthermore, the bolt mounting holes employ a countersunk structure, which effectively shields the bolt heads from the electric field, enhancing overall insulation performance and ensuring stable operation of the equipment under high-voltage environments. In terms of materials and current-carrying capacity, the contact seat is made of cast aluminum alloy, combined with casting processing technology, which significantly reduces production costs. The design of the silver-plated layer on the inner wall of the conductive spring groove and the vent holes ensures the current-carrying effect and process feasibility of the electrical connection. By rationally arranging the bolt fixing holes and setting the beveled mounting slot, the cross-sectional area of ​​the seat is increased, enabling the contact seat to meet the high current carrying requirements of 3465A, thereby improving the load capacity and reliability of the equipment. Furthermore, this structure prioritizes ease of assembly and optimized manufacturing processes. The guide ring and beveled design at the front end of the conductor mounting cavity facilitate conductor insertion and ensure coaxiality, preventing collisions during assembly. The rear stop structure enables precise positioning and fixation with the insulator insert. These detailed design features not only improve installation efficiency but also enhance the overall integrity and stability of the structure, thereby extending the equipment's service life. It is suitable for a wide range of applications in 110kV shared-enclosure GIS independent gas chambers. Attached Figure Description

[0012] Figure 1 An installation effect diagram of the contact seat structure for a 110kV GIS independent air chamber current transformer; Figure 2 Structural diagram of the contact seat structure for a 110kV GIS independent gas chamber current transformer (view 1). Figure 3 Structural diagram of the contact seat structure for a 110kV GIS independent gas chamber current transformer (perspective 2). Figure 4 A cross-sectional view of the contact seat structure for a 110kV GIS independent gas chamber current transformer; Reference numerals in the attached drawings: 1. Base; 2. Conductor; 3. Insulator insert; 4. Angled; 5. Guide groove; 6. Multi-radius arc; 7. Conductive spring groove; 8. Vent hole; 9. Mounting hole; 10. Stop structure; 11. Angled mounting slot; 12. Recessed platform structure; 13. Conductor mounting cavity. Detailed Implementation

[0013] like Figures 1-4As shown, this utility model proposes a contact seat structure for a 110kV GIS independent air chamber current transformer, including a seat body 1. The seat body 1 is configured as an eccentric structure consisting of a front end and a rear end, which is suitable for connecting the conductor 2 of a 110kV common-enclosure GIS independent air chamber current transformer. The spacing between the three-phase conductors can be increased to reduce the electric field strength, and the outer diameter of the coil can be increased to reduce the coil height. The front end of the base 1 is provided with a conductor mounting cavity 13 for connecting the conductor 2. The front end of the conductor mounting cavity 13 is provided with a guide groove 5 for installing a polytetrafluoroethylene guide ring, which can ensure the coaxiality of the conductor 2 and the front end of the base 1 after the conductor 2 is installed, and at the same time prevent the conductor 2 from having a large sway gap. The rear end of the conductor mounting cavity 13 is provided with a conductive spring groove 7 for installing a conductive spring, so as to realize the electrical connection between the conductor 2 and the base 1. To ensure the current carrying effect of the electrical connection, the rear end of the base 1 is provided with four sets of mounting holes 9. One set of mounting holes 9 penetrates the rear end of the base 1 and connects to the conductor mounting cavity 13. The other three sets of bolt mounting holes 9 are exposed on the outside of the base 1 and are set as a recessed platform structure 12 to facilitate the electric field shielding of the bolt head. The base 1 is made of cast aluminum alloy. By reasonably designing the position and size of the bolt fixing holes, the cross-sectional area at the minimum cross-section meets the current carrying requirement of 3465A, thereby reducing the production cost.

[0014] It should be further explained that the inner wall of the conductive spring groove 7 is provided with a 10um electroplated silver layer, and a vent hole 8 is also provided to connect the conductor mounting cavity 13, so as to facilitate the exhaust of the base 1 during the electroplating of silver.

[0015] It should be further explained that the front end and the rear end of the base 1 are provided with multi-radius circular arcs 6, which can reduce the electric field intensity on the surface of the base 1.

[0016] It should be further explained that the opening of the conductor mounting cavity 13 is provided with an angled 4 to facilitate the assembly of the conductor 2 and prevent the conductor from colliding with the contact seat during the assembly process.

[0017] It should be further explained that, in order to increase the cross-sectional area of ​​the seat body 1 and improve the flow effect, the three sets of bolt mounting holes 9 are provided with embedded beveled mounting slots 11; this not only facilitates the installation of the fixing bolts, but also increases the cross-sectional area of ​​the seat body 1.

[0018] It should be further explained that the rear end of the base 1 is provided with a stop structure 10 that surrounds the four sets of mounting holes 9. The stop structure 10 is used for the positioning and fixing of the base 1 and the insulator insert 3.

[0019] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A contact seat structure for a 110kV GIS independent air chamber current transformer, characterized in that, Includes a base (1), which is configured as an eccentric structure consisting of a front end and a rear end; The front end of the base (1) is provided with a conductor mounting cavity (13) for connecting the conductor (2); the front end of the conductor mounting cavity (13) is provided with a guide groove (5) for installing a guide ring made of polytetrafluoroethylene, and the rear end of the conductor mounting cavity (13) is provided with a conductive spring groove (7) for installing a conductive spring. The rear end of the base (1) is provided with four sets of mounting holes (9), one set of mounting holes (9) penetrates the rear end of the base (1) and connects to the conductor mounting cavity (13), and the other three sets of bolt mounting holes (9) are exposed outside the base (1) and are set as a recessed platform structure (12). The base (1) is made of cast aluminum alloy.

2. The contact seat structure for a 110kV GIS independent gas chamber current transformer according to claim 1, characterized in that, The inner wall of the conductive spring groove (7) is provided with a 10um electroplated silver layer, and a vent hole (8) is also provided to connect the conductor mounting cavity (13).

3. The contact seat structure for a 110kV GIS independent gas chamber current transformer according to claim 1, characterized in that, The front end and the rear end of the seat (1) are provided with multi-radius circular arcs (6).

4. The contact seat structure for a 110kV GIS independent gas chamber current transformer according to claim 1, characterized in that, An angle (4) is provided at the opening of the conductor mounting cavity (13).

5. The contact seat structure for a 110kV GIS independent gas chamber current transformer according to claim 1, characterized in that, An embedded beveled mounting slot (11) is provided at the three sets of bolt mounting holes (9).

6. The contact seat structure for a 110kV GIS independent gas chamber current transformer according to claim 1, characterized in that, The rear end of the base (1) is provided with a stop structure (10) that surrounds the four sets of mounting holes (9).

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