SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance

Abstract

The utility model belongs to the technical field of combined electric appliances, and particularly relates to an SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance. The SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance comprises a bottom frame on which a circuit breaker and a bus three-position switch are arranged, and is characterized in that one end of the circuit breaker is connected with an isolating switch, the other end of the circuit breaker is connected with a current transformer, the current transformer is connected with a circuit three-position switch, the circuit three-position switch is connected with a branch bus, and the branch bus is connected with the isolating switch. And a quick grounding switch is connected below the branch bus. The beneficial effects of the utility model are that except that the gas chamber of the circuit breaker is filled with SF6 gas, the other gas chambers are all filled with SF6N2 mixed gas, the insulation performance of the original SF6 is maintained, the electric strength is high, the arc extinguishing capability is strong, the discharge amount of greenhouse gases such as SF6 is reduced, the structure is compact, the reliability is high, the modularization is high, and the installation and debugging are convenient and fast.

Description

Technical Field

[0001] This utility model belongs to the field of combined electrical appliance technology, and specifically relates to an SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance. Background Technology

[0002] SF6 gas, due to its high insulation and stability, is widely used in high-voltage electrical equipment. In 110kV transmission lines, 126V switchgear uses SF6 gas insulation. However, research shows that SF6 is a potent greenhouse gas, with a greenhouse effect approximately 23,500 times stronger than carbon dioxide, and it can remain in the atmosphere for over 3,000 years, significantly impacting global warming. Therefore, prolonged operation and maintenance may lead to gas leaks in switches, resulting in substantial greenhouse gas emissions and environmental pollution. Under pressure from environmental regulations, countries are seeking alternatives to SF6 gas in high-voltage transmission and distribution projects. The most economical and suitable solution currently available is one that ensures high-voltage electrical insulation performance while minimizing greenhouse gas emissions. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides an SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance.

[0004] This utility model is achieved through the following technical solution:

[0005] An SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance includes a base frame on which a circuit breaker and a busbar three-position switch are mounted. The circuit breaker is characterized in that: one end is connected to a disconnecting switch, the other end is connected to a current transformer, the current transformer is connected to the line three-position switch, the line three-position switch is connected to a branch busbar, and a fast grounding switch is connected below the branch busbar.

[0006] The branch busbar is connected to the voltage transformer via a three-way module.

[0007] The branch busbar is connected to the sleeve outlet unit.

[0008] A live indicator is provided on the branch bus.

[0009] The circuit breaker's gas chamber is filled with SF6 gas at 0.6 MPa.

[0010] The gas chambers of the disconnecting switch, fast grounding switch, busbar three-position switch, line three-position switch, current transformer, voltage transformer, branch busbar, and bushing outgoing unit are filled with 0.6 MPa of SF6N2 mixed gas.

[0011] The volume ratio of SF6 to N2 in the SF6N2 mixture is 3:7. 。

[0012] The intelligent control cabinet is installed on the base frame.

[0013] The beneficial effects of this utility model are: except for the circuit breaker gas chamber which is filled with SF6 gas, all other gas chambers are filled with a mixture of SF6 and N2 gas. This not only retains the original insulation performance of SF6, high electrical strength, and strong arc extinguishing ability, but also reduces the emission of greenhouse gases such as SF6. The structure is compact, highly reliable, and has the advantages of high modularity and convenient and quick installation and commissioning. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] In the diagram, 1 is the base frame, 2 is the circuit breaker, 3 is the busbar three-position switch, 4 isolating switch, 5 is the current transformer, 6 is the line three-position switch, 7 is the branch busbar, 8 is the fast grounding switch, 9 is the tee module, 10 is the voltage transformer, 11 is the bushing outgoing unit, 12 is the live display, and 13 is the intelligent control cabinet. Detailed Implementation

[0017] The attached figure shows a specific embodiment of this utility model. This embodiment includes a base frame 1, on which a circuit breaker 2 and a busbar three-position switch 3 are mounted. One end of the circuit breaker 2 is connected to a disconnecting switch 4, and the other end is connected to a current transformer 5. The current transformer 5 is connected to a line three-position switch 6, which is connected to a branch busbar 7. A fast grounding switch 8 is connected below the branch busbar 7. The branch busbar 7 is connected to a voltage transformer 10 via a three-way module 9. A bushing outlet unit 11 is connected above the branch busbar 7. A live indicator 12 is provided on the branch busbar 7.

[0018] Circuit breaker 2's gas chamber is filled with 0.6 MPa of SF6 gas. Disconnecting switch 4, fast grounding switch 8, busbar three-position switch 3, line three-position switch 6, current transformer 5, voltage transformer 10, branch busbar 7, and bushing outgoing unit 11's gas chambers are filled with 0.6 MPa of a SF6N2 mixed gas. The volume ratio of SF6 to N2 in the SF6N2 mixed gas is 3:7. 。 The intelligent control cabinet 13 is installed on the base frame 1.

[0019] This invention relates to an environmentally friendly metal-enclosed combined electrical appliance with SF6 / N2 mixed gas insulation. The SF6 / N2 mixture is in a 3:7 ratio, with N2 as the primary medium and 30% SF6 as the insulating medium. Compared to pure SF6, this significantly reduces the amount of SF6 used, resulting in advantages such as low cost, good environmental performance, wide applicability, and high reliability. Applying the 3:7 SF6 / N2 ratio to high-voltage electrical equipment retains the original insulating properties of SF6, including high dielectric strength and strong arc-extinguishing capability, while reducing emissions of greenhouse gases such as SF6. In the gas chambers of disconnecting switch 4 and fast grounding switch 8, adjusting the SF6 / N2 mixing ratio appropriately can improve the breaking capacity.

[0020] This utility model utilizes an SF6N2 mixed gas insulated, metal-enclosed environmentally friendly combined electrical appliance. The intelligent control cabinet 13, circuit breaker 2, and busbar three-position switch 3 are sequentially mounted on the base frame 1. A line three-position switch 6 and a fast grounding switch 8 or a maintenance grounding switch are configured on the outgoing bushing side. Current transformers 5 are installed on the incoming and outgoing sides of circuit breaker 2, converting a large primary current into a small secondary current to achieve line measurement, metering, and protection. Each standard unit module is assembled, and the intelligent control cabinet 13 and circuit breaker 2 are mounted on the base frame 1. The circuit breaker mechanism box is then installed, and the mechanical characteristic parameters of the circuit breaker mechanism are adjusted. The busbar three-position switch 3 is installed, and the current transformer 5 is assembled on the stationary side of circuit breaker 2. Finally, the line three-position switch 6 and fast grounding switch 8 on the outgoing bushing side are installed on the stationary outgoing side of circuit breaker 2, and finally, the bushing outgoing unit 11 is installed.

[0021] Circuit breaker 2, busbar three-position switch 3, and fast grounding switch 8 employ three-phase mechanical linkage operation to ensure phase-to-phase synchronization. Measurement, control, and signal cables are connected to the intelligent control cabinet 13 via flexible metal conduits and cable trays. The intelligent terminal and merging unit within the cabinet collect signals, enabling remote control, telemetry, and remote signaling functions. Circuit breaker 2's gas chamber is filled with SF6 gas at a rated pressure of 0.6 MPa to ensure insulation and breaking performance. Busbar three-position switch 3 and disconnector switch 4 are filled with a 0.6 MPa SF6 / N2 mixed gas to ensure busbar transfer current, small inductance, and small capacitance current tests. Fast grounding switch 8 is filled with a 0.6 MPa SF6 / N2 mixed gas to ensure electromagnetic induction and electrostatic induction opening and closing tests. Current transformer 5, voltage transformer 10, branch busbar 7, and bushing outgoing unit 11 are filled with a 0.6 MPa SF6 / N2 mixed gas to ensure insulation.

Claims

1. An SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance, comprising a base frame (1), on which a circuit breaker (2) and a busbar three-position switch (3) are mounted, characterized in that: One end of the circuit breaker (2) is connected to the disconnecting switch (4), and the other end of the circuit breaker (2) is connected to the current transformer (5). The current transformer (5) is connected to the line three-position switch (6), the line three-position switch (6) is connected to the branch bus (7), and the branch bus (7) is connected to the fast grounding switch (8).

2. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 1, characterized in that: The branch bus (7) is connected to the voltage transformer (10) through the three-way module (9).

3. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 1, characterized in that: The branch busbar (7) is connected to the bushing outlet unit (11).

4. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 1, characterized in that: The branch bus (7) is equipped with a live display (12).

5. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 1, characterized in that: The gas chamber of the circuit breaker (2) is filled with SF6 gas at 0.6 MPa.

6. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 2 or 3, characterized in that: The gas chambers of the isolating switch (4), fast grounding switch (8), bus three-position switch (3), line three-position switch (6), current transformer (5), voltage transformer (10), branch bus (7), and bushing outgoing unit (11) are filled with 0.6 MPa of SF6N2 mixed gas.

7. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 6, characterized in that: The volume ratio of SF6 to N2 in the SF6N2 mixture is 3:

7. 。 8. The SF6N2 mixed gas insulated metal-enclosed environmentally friendly combined electrical appliance according to claim 1, characterized in that: The intelligent control cabinet (13) is installed on the base frame (1).

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