Interlocking device of three-position disconnector, circuit breaker and lower cabinet door of gas-filled cabinet

By using the interlocking device between the three-position disconnector, circuit breaker and the lower cabinet door of the gas-filled switchgear, the lower cabinet door is allowed to be opened only when the three-position disconnector is in the grounded closed position and the circuit breaker is in the closed state. This solves the safety problem of the high-voltage switchgear and ensures the safety of the staff and the reliable grounding status of the system.

CN224384123UActive Publication Date: 2026-06-19SUZHOU LAMBDA ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SUZHOU LAMBDA ELECTRIC CO LTD
Filing Date
2025-06-16
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing high-voltage switchgear cannot be opened at will during normal operation and must be kept grounded during maintenance, but lacks effective interlocking devices to ensure safety.

Method used

Design an interlocking device for a three-position disconnector, a circuit breaker, and the lower cabinet door of a gas-filled switchgear. Through the coordinated operation of the interlocking rod, interlocking components, and microswitches, the lower cabinet door is allowed to open only when the three-position disconnector is in the grounded closed position and the circuit breaker is in the closed state, ensuring that the system is in a reliable grounded state.

Benefits of technology

It enables reliable opening of the cabinet door under specific conditions, ensuring staff safety, avoiding operation with live electricity, and features a simple structure and low cost.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a three position isolator, circuit breaker and interlocking device of inflator lower cabinet door, including interlock lever and first, second interlocking piece, interlock lever can be set up in the cabinet of inflator and be elastic motion up and down, and interlock lever lower extreme is used for controlling lower cabinet door to open or lock, first interlocking piece one end is connected with interlock lever upper end, and the other end can cooperate with the baffle of three position isolator to block or allow interlock lever to make ascending motion, second interlocking piece is equipped with the brake interlocking plate of interlock lever connection and the crank arm interlocking plate of sleeve joint in circuit breaker's rotating main shaft, and the crank arm interlocking plate can form the blocking or unblocking of brake interlocking plate under the drive of rotating main shaft, through three position isolator, circuit breaker, interlock lever and first, second interlocking piece cooperation, realize when three position isolator is in the earthing closing position and circuit breaker is in the closing state, and lower cabinet door can be controlled to open by interlock lever, guarantee the whole system to be in reliable earthing state, and guarantee personnel safety.
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