Modular Mechanical Interlock for Switchgear Circuit Breakers
Solution Overview
Problem
Conventional mechanical interlock structures for switchgear circuit breakers are not robust, require many parts, and lack modularity and cost-effectiveness, making them inefficient for ensuring safe mechanical contact closure across different circuit breaker platforms.
Innovation Solution
A mechanical interlock structure featuring a travel adjuster, engaging member, slide member, and linkage structure that moves between operative and inoperative positions to prevent or allow contact closure, coupled with an actuating structure to ensure safe and modular operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical interlock structures are used, then safety function is provided, but the structure requires many parts and is not robust
Solution Approach 1:
The patent combines multiple interlock functions into a single integrated mechanical interlock structure. The interlock structure includes a body, engaging member, slide member, and linkage structure that work together as one unified mechanism rather than separate components, reducing part count while maintaining safety functionality.
Solution Approach 2:
The mechanical interlock structure is designed to be modular and adaptable across different circuit breaker platforms. The interlock structure can prevent contact closure in multiple scenarios (during racking operations, when disconnecting devices are not in proper position) and works with various circuit breaker types, providing universal safety functionality.
2Adaptability or versatility
If conventional mechanical interlock structures are used, then safety function is provided, but the structure lacks modularity and cost-effectiveness
Solution Approach 1:
The interlock structure is designed as a modular unit that can be adapted to different circuit breaker platforms. The body, engaging member, and linkage structure can be configured to work with various circuit breaker types and racking mechanisms, providing cross-platform compatibility without requiring complete redesign for each application.
Solution Approach 2:
The mechanical interlock is designed as a separate, self-contained module that can be independently manufactured and then integrated into the circuit breaker assembly. This segmentation allows for specialized manufacturing of the interlock structure and simplifies replacement or upgrade operations.
3Reliability
If the slide member is in the operative position, then contact closure is prevented, but the engaging member cannot enter the bore
Solution Approach 1:
The slide member is positioned to block the bore and prevent the engaging member from entering before any unintended contact closure can occur. This preliminary blocking action during racking operations ensures that the circuit breaker cannot close contacts unless the proper operational sequence is followed and the slide member is moved to the inoperative position.
Data Source
AI summary
An interlock structure is coupled between actuating structure and a travel adjuster of a circuit breaker. The interlock structure includes a body having a bore therein. An engaging member has a portion sized to be received by the bore and the engaging member is coupled with the travel adjuster for movement therewith. A slide member is movable with respect to the body between operative and inoperative positions. Linkage structure is coupled to the slide member for moving the slide member and is also coupled to the actuating structure such that upon movement of the actuating structure, the linkage structure moves the slide member to the operative position so that the slide member blocks at least a portion of the bore to prevent the engaging member from entering the bore and thus prevents the travel adjuster from moving in a certain direction to allow the closure of the circuit breaker contacts.