Upper-isolation and upper-grounding SF6 gas-insulated switchgear incoming cabinet structure

By placing the isolating and grounding switch at the upper end of the vacuum interrupter in the SF6 gas cabinet and introducing a locking mechanism, the maintenance hidden dangers caused by the position of the isolating switch and the grounding switch in the existing technology are solved, and safer and more reliable operation and flexible combination application are achieved.

CN223414451UActive Publication Date: 2025-10-03ZHUHAI DEXIN ELECTRIC EQUIP CO LTD
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Patent Information

Application Number
CN202422803023.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-10-03
Estimated Expiration
2034-11-15

AI Technical Summary

Technical Problem

The isolating switch and grounding switch of the existing SF6 filling cabinet are fixed at the bottom of the circuit breaker, which poses a safety hazard during maintenance, especially when the isolating break is close to the lower end of the incoming cable in the incoming cabinet, making maintenance unsafe.

Method used

A top-isolated and top-grounded SF6 gas-filled cabinet incoming cabinet structure is designed. The isolating and grounding switch is placed at the upper end of the vacuum interrupter, and a chain mechanism is used to ensure consistent operation sequence, including a chain mechanism between the isolating and grounding switch operating mechanism and the circuit breaker operating mechanism, which is linked to the lower door panel to prevent misoperation.

Benefits of technology

It enables safer and more reliable operations during inspection and maintenance, avoids misoperation, improves the safety and flexibility of the equipment, and is suitable for various environments and power usage scenarios.

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Abstract

The utility model provides an upper-isolation and upper-grounding wire inlet cabinet structure of an SF6 gas-insulated switchgear. The upper-isolation and upper-grounding SF6 gas-filled cabinet wire inlet cabinet structure comprises a gas cabinet, a switch cabinet and a switch mechanism. A vacuum arc-extinguishing chamber is fixed in the gas cabinet, the lower end is provided with a gas box and a lower door plate, and the upper end of the vacuum arc-extinguishing chamber is in contact connection with the switching mechanism. The switch mechanism comprises an isolation grounding switch operation mechanism located above the circuit breaker operation mechanism, and an interlocking mechanism is arranged between the isolation grounding switch operation mechanism and the circuit breaker operation mechanism. The interlocking mechanism comprises an energy storage mechanism, a first interlocking plate, a second interlocking plate, a transmission plate and a third interlocking plate, and the correct sequence of operation is ensured. A reset spring is arranged on the third interlocking plate, and the air box is made of stainless steel. According to the invention, the isolation grounding switch is arranged at the upper end of the vacuum arc-extinguishing chamber, so that the problem of potential safety hazards when an existing SF6 gas-insulated switchgear is used as a wire inlet cabinet is solved. The utility model can be widely applied to the technical field of electrical equipment.
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