Double-Break Isolator Switch With Integrated Grounding Interlock
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Solution Overview
Problem
Conventional isolator switches in gas-insulated metal-enclosed switchgear require de-energizing the entire busbar or power station for expansion and testing, and lack mechanical interlocking with grounding switches, limiting their usability and safety.
Innovation Solution
A double-break isolator switch with integrated two isolation break points and one grounding break point, featuring a connecting rod mechanism that enables mechanical interlocking and linked movement with a grounding switch, allowing safe and efficient operation without shutting off power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional isolator switch with one break point is used, then the structure is simple, but it requires de-energizing the entire busbar or power station for expansion and testing
Solution Approach 1:
The isolator switch is divided into two independent break points (first break point and second break point) instead of one. Each break point can be opened or closed independently, allowing the busbar to be divided into isolated sections. This enables expansion and testing operations on one section without de-energizing the entire busbar or power station, thus improving operational convenience while maintaining structural simplicity.
2Ease of manufacture
If a conventional isolator switch is externally connected to a grounding switch module, then the grounding function is achieved, but it is wasteful and mechanical interlocking is not possible
Solution Approach 1:
The grounding switch module is merged with the isolator switch to form an integrated unit. The housing of the isolator switch also serves as the housing for the grounding switch module. The driving mechanism is shared between both switches, and the connecting rod mechanism coordinates the operation of both switches. This integration eliminates the need for separate external connections, reduces waste, and enables mechanical interlocking where the opening of the isolator switch automatically triggers the closing of the grounding switch, improving safety through enforced interlocking.
3Ease of operation
If a double-break isolator switch with integrated grounding function is designed, then safety and operational flexibility are improved, but the device complexity increases
Solution Approach 1:
The isolator switch is designed to perform multiple functions: isolation (through two break points) and grounding (through the integrated grounding switch module). The driving mechanism and connecting rod mechanism serve both the isolator switch and the grounding switch module simultaneously. This multi-functionality allows the device to provide operational flexibility (independent control of two break points and grounding function) while avoiding the need for completely separate devices, thus limiting the increase in overall complexity.
Solution Approach 2:
The connecting rod mechanism acts as an intermediary between the driving mechanism and the moving contacts of both the isolator switch and grounding switch module. It coordinates the motion of multiple components, ensuring that when the isolator switch opens, the grounding switch automatically closes. This intermediary mechanism enables complex coordinated operation while maintaining a relatively simple overall structure through mechanical linkage rather than complex control systems.
Data Source
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AI summary
A double-break isolator switch, comprising: a housing; a support fixed in the housing; a first contact seat, a second contact seat and a third contact seat, respectively disposed at a first side, a second side and a third side within the housing; a first moving contact, a second moving contact and a third moving contact, slidably supported on the support and respectively used to engage with the first contact seat, the second contact seat and the third contact seat; a connecting rod mechanism, connected to the first moving contact, the second moving contact and the third moving contact, and driven by a driving mechanism, so as to drive the first moving contact, the second moving contact and the third moving contact, such that the double-break isolator switch has a first working position and a second working position. In the first working position, the first moving contact is engaged with the first contact seat and the second moving contact is engaged with the second contact seat, and the third moving contact is separated from the third contact seat. In the second working position, the third moving contact is engaged with the third contact seat, and the first moving contact is separated from the first contact seat and the second moving contact is separated from the second contact seat.