An environmentally friendly busbar connection device for gas-insulated switchgear

Abstract

This utility model discloses an environmentally friendly busbar connection device for gas-insulated switchgear, relating to intelligent power distribution equipment and gas-insulated AC metal-enclosed switchgear. It includes a top-expanded branch busbar, which distributes the circuit on the entire top-expanded busbar to a three-position switch. The three-position switch then distributes the current through an insulating bushing to the busbar branch connection conductor between the circuit breaker and the insulating bushing. This busbar branch connection conductor consists of two busbar connection pads and the branch busbar conductor body. After the current is distributed to the lower end of the circuit breaker, it passes through the outgoing branch busbar and then out through the outgoing bushing. A protective voltage-detecting branch busbar can be configured on the outgoing branch busbar. The current then passes through this voltage-detecting branch busbar to the transition busbar pad and then to the insulating socket. All these busbars are collectively referred to as copper rod busbars.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, specifically relating to a busbar connection device for an environmentally friendly gas-insulated switchgear, applicable to indoor high-voltage AC power distribution systems. Background Technology

[0002] In current power systems, environmental protection, energy conservation, maintenance-free operation, and high reliability are the main development directions for switchgear. Environmentally friendly gas-insulated switchgear on the market uses dry air and other environmentally friendly gases to replace traditional SF6 gas, effectively avoiding the greenhouse effect and environmental hazards of SF6. It has become a key piece of equipment in the medium- and high-voltage power distribution field. The busbar connection system, as the key to transmitting electrical energy within the environmentally friendly gas-insulated switchgear, directly determines the equipment's reliability, conductivity, and operational stability, and is the core of the environmentally friendly gas-insulated switchgear. Currently, mainstream busbar connection technologies on the market suffer from several problems. Firstly, for 1250 / 2500A current, most employ multiple rectangular busbars. This structure suffers from poor electric field uniformity and a large skin effect coefficient, resulting in low current-carrying capacity per unit cross-section, high power loss, poor heat dissipation, low busbar utilization, and high costs. Furthermore, to ensure insulation, electrical clearances often need to be increased. Secondly, busbars are typically directly bolted together, leading to severe electric field distortion at the lap surface, which easily causes insulation breakdown. Thirdly, while some busbars are wrapped with insulation layers, this significantly increases assembly time, assembly difficulty, and reduces assembly accuracy. These issues contradict the development requirements of environmentally friendly gas-insulated switchgear. Therefore, improving the busbar connection system is essential for the development of environmentally friendly gas-insulated switchgear. Summary of the Invention

[0003] The purpose of this invention is to improve the reliability of the busbar connection device in environmentally friendly gas-insulated switchgear, increase conductivity, reduce assembly time, and lower costs. Copper rod busbars are a busbar structure adaptable to high-current scenarios. While increasing the current-carrying capacity per unit cross-section, they can optimize the electric field distribution, reduce the skin effect, and significantly reduce insulation risks under high-voltage conditions. While improving performance, the optimized structure increases material utilization, reduces copper consumption, and lowers equipment manufacturing costs, providing technical support for the large-scale application of environmentally friendly gas-insulated switchgear in high-voltage, high-current scenarios.

[0004] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows: an environmentally friendly gas-insulated switchgear busbar connection device, which includes a top-expanded branch busbar 2. The top-expanded branch busbar 2 distributes the circuit on the entire top-expanded busbar bushing 3 to a three-position switch 4. The three-position switch 4 then distributes the current to the busbar branch connection conductor 9 between the circuit breaker 7 and the insulating bushing 11 via an insulating bushing 11. The busbar branch connection conductor 9 is composed of a first busbar connection pad 8, a second busbar connection pad 10, and the main body of the busbar branch connection conductor 9. After the current is distributed to the lower end of the circuit breaker 7, it passes through the outgoing branch busbar 6 and is then transmitted through the outgoing bushing 12. The outgoing branch busbar 6 is equipped with a protective voltage detection branch busbar 5. The current passes through the voltage detection branch busbar 5 to the transition busbar pad 13 and then to the insulating socket 1. All the busbars in this process are collectively referred to as copper rod busbars. The copper rod busbar is made of solid copper rod and is formed by cold forging. The mounting holes and surfaces required for fasteners are machined on it. The principle is to ensure that the fasteners can be completely placed inside the cavity of the copper rod conductor after fastening, and the fastener body is not visible from the external side view. All machined planes and slots are rounded to equalize the electric field strength of the conductor.

[0005] Beneficial effects: 1. Improved insulation performance: The use of copper rods as the main structure, combined with the arc transition of the lap joint, effectively optimizes the electric field distribution and improves the insulation stability during long-term operation; 2. Improved conductivity: Compared with rectangular busbars, copper rods as busbars reduce the skin effect coefficient and increase the current carrying capacity per unit cross-sectional area. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the busbar connection device for the environmentally friendly gas-insulated switchgear in this embodiment.

[0007] Figure 2 This is a schematic diagram of one design scheme for the copper rod busbar in this embodiment.

[0008] The labels for the attached figures are as follows: 1 is an insulated socket; 2 is a top-expanded branch busbar; 3 is a top-expanded busbar bushing; 4 is a three-position switch; 5 is a voltage detection branch busbar; 6 is an outgoing branch busbar; 7 is a circuit breaker; 8 is a first busbar connection pad; 9 is a busbar branch connection conductor; 10 is a second busbar connection pad; 11 is an insulated bushing; 12 is an outgoing bushing; 13 is a transition busbar pad. Detailed Implementation

[0009] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0010] The busbar connection device for the environmentally friendly gas-insulated switchgear in this embodiment.Figure 1 This is a schematic diagram of the busbar connection device for the environmentally friendly gas-insulated switchgear in this embodiment. It includes a top-expanded branch busbar 2, which distributes the circuit on the entire top-expanded busbar bushing 3 to the three-position switch 4. The three-position switch 4 then distributes the current to the busbar branch connection conductor 9 between the circuit breaker 7 and the insulating bushing 11 via the insulating bushing 11. The busbar branch connection conductor 9 is composed of a first busbar connection pad 8, a second busbar connection pad 10, and the main body of the busbar branch connection conductor 9. After the current is distributed to the lower end of the circuit breaker 7, it passes through the outgoing branch busbar 6 and is then transmitted through the outgoing bushing 12. The outgoing branch busbar 6 is equipped with a protective voltage detection branch busbar 5. The current passes through the voltage detection branch busbar 5 to the transition busbar pad 13 and then to the insulating socket 1. All the busbars in this process are collectively referred to as copper rod busbars. The copper rod busbar is made of solid copper rod and is formed by cold forging. The mounting holes and surfaces required for fasteners are machined on it. The principle is to ensure that the fasteners can be completely placed inside the cavity of the copper rod conductor after fastening, and the fastener body is not visible from the external side view. All machined planes and slots are rounded to equalize the electric field strength of the conductor.

[0011] Figure 2 This is a schematic diagram of one design scheme for the copper rod busbar in this embodiment.

[0012] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A busbar connection device for an environmentally friendly gas-insulated switchgear, characterized in that: It includes a top expansion branch busbar (2), which distributes the circuit on the entire top expansion busbar bushing (3) to the three-position switch (4). The three-position switch (4) then distributes the current to the busbar branch connection conductor (9) between the circuit breaker (7) and the insulating bushing (11) via the insulating bushing (11). The busbar branch connection conductor (9) is composed of a first busbar connection pad (8), a second busbar connection pad (10), and the main body of the busbar branch connection conductor (9). After the current is distributed to the lower end of the circuit breaker (7), it passes through the outgoing branch busbar (6) and is then transmitted through the outgoing bushing (12). The outgoing branch busbar (6) is equipped with a voltage detection branch busbar (5) with protective properties. The current passes through the voltage detection branch busbar (5) to the transition busbar pad (13) and then to the insulating socket (1). All of these busbars are collectively referred to as copper rod busbars.

2. The busbar connection device for the environmentally friendly gas-insulated switchgear according to claim 1, characterized in that: The copper rod busbar is made of solid copper rod and is formed by cold forging. The mounting holes and surfaces required for fasteners are machined on it. The principle is to ensure that the fasteners can be completely placed inside the cavity of the copper rod conductor after fastening, and the fastener body is not visible from the external side view. All machined planes and slots are rounded to equalize the electric field strength of the conductor.

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