This fault is the main fault of high-voltage switchgear, and its causes can be divided into two categories. One is caused by the mechanical failure of the operating mechanism and transmission system, which is specifically manifested in the mechanism jamming, component deformation, displacement or damage, opening and closing iron core loosening, jamming, shaft pin loosening, tripping failure, etc. The other is caused by electrical control and auxiliary circuit, which is manifested as poor contact of secondary wiring, loose terminals, wrong wiring, burning of opening and closing coil due to mechanism jamming or poor transfer switch, poor switching of auxiliary switch, and failure of operating power supply, closing contactor, micro switch, etc.

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