Switchgear Snap-Closing Shaft Welded Contact Signaling
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Solution Overview
Problem
Existing electrical cut-off devices lack a reliable signaling mechanism for welded contacts of the same phase without requiring additional parts, and existing solutions are limited to signaling only two welded contacts of the same phase.
Innovation Solution
The control device incorporates a snap-closing shaft with a first lever cooperating with a cam and second levers integral with the movable contacts, along with a hooking mechanism on the snap-closing shaft, allowing for credible signaling of welded contacts without additional parts, where the second levers and third levers cooperate with contact supports and abutments to prevent movement when contacts are welded, utilizing the stored energy for sudden closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a signaling device for welded contacts is added to the electrical cut-off device, then the reliability of detecting welded contacts is improved, but the device complexity increases due to additional parts
Solution Approach 1:
The signaling function is merged with the existing snap-closing shaft and handle mechanism. The hook-shaped part is integrated into the snap-closing shaft, and the cam is formed on the handle, eliminating the need for separate signaling components while achieving reliable detection of welded contacts through the interaction of these integrated elements.
Solution Approach 2:
The snap-closing shaft serves dual functions: it controls the sudden closure of contacts and simultaneously provides signaling for welded contacts through its hook-shaped part. The handle also serves multiple purposes while forming the cam that interacts with the hook, making the existing components multi-functional and avoiding additional parts.
2Device complexity
If existing signaling mechanisms are used, then the device complexity is reduced, but the signaling capability is limited to only two welded contacts of the same phase
Solution Approach 1:
The hook-shaped part on the snap-closing shaft is positioned to interact with the cam on the handle in a specific geometric relationship. This local geometric configuration enables the mechanism to detect welded contacts of the same phase effectively, providing enhanced signaling capability while maintaining simplicity through the localized interaction design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable and efficient signaling of welded contacts without additional components, ensuring the movement of the snap-closing shaft and handle is prevented when contacts are welded, providing a credible indication of the soldered state through the stored energy mechanism, enhancing the control device's reliability and simplicity.
Implementation Method 1
a snap-closing shaft (7), said snap-closing shaft (7) being intended, at the start of the closing operation manually of the stalk and over a certain stroke of the latter, to retain the movable contact(s) in the open position by storing energy, and after this stroke of the stalk, to release the movable contact(s) in such a way that the energy previously stored causes the sudden closing of the contacts
Implementation Method 2
the means for signaling the welded state of the contacts of the same phase are carried in part by the shaft aforementioned sudden closure and partly by the cam
Data Source
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AI summary
The device has a quick closing device including a quick closing shaft (7) that releases movable contacts (4) such that stored energy drives quick closing of the contacts after the course of a manual operating handle (6). A signaling device signals a welded state of the contacts of a same phase, and has a hook (17) integrated to levers (13, 15) of the shaft. The levers are co-operated with a cam (14) of the handle and the contacts, respectively, to retain the handle in an intermediate position when the contacts are welded. The contacts are mounted on respective insulating contact supports.