Switchgear Panel Secondary Plug Interlock Mechanism
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Solution Overview
Problem
Existing panels allow draw-out devices, such as vacuum circuit breakers, to be racked into service position without ensuring proper connection of secondary plugs, which can lead to improper usage.
Innovation Solution
Incorporation of secondary blocking means, including a cover plate and a pivotably arranged lever with a guide roller, that prevents the door from closing unless secondary plugs are connected, ensuring that secondary plugs must be connected before the draw-out device can be moved to the service position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secondary blocking means are added to prevent door closure without proper plug connection, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The secondary blocking means are integrated with the existing door assembly and primary blocking means. The cover plate, blocking pin, and spring form a compact mechanism that works together with the door and primary blocking means to provide the additional safety function without requiring a completely separate blocking system.
Solution Approach 2:
The cover plate serves multiple functions: it blocks access to secondary plugs when in the first position, couples to the blocking pin to prevent door closure, and moves to the second position to allow door closure once plugs are connected. The blocking pin also serves dual function by both blocking door closure and indicating plug connection status.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A panel (2) for accommodating a draw-out device such as a vacuum circuit breaker (3) and a combination of them are provided. The panel (2) comprises: a housing (4) with an access opening (5) for accommodating a draw-out device and with primary plugs and secondary plugs (11) for the draw-out device to connect to; a traveling system arranged in the housing (4) for positioning the draw-out device within the housing (4) in a connected position, a service position and a disconnected position; a door (6) arranged to the housing (4) movable between a closed position for closing the access opening (5) of the housing (4) and an open position for providing access to the housing (4); primary blocking means for blocking the movement of the traveling system from the disconnected position to the service position with the door (6) in the open position or between the open position and the closed position; and secondary blocking means for blocking the door (6) to move into the closed position with the draw-out device being disconnected from the secondary plugs (11).