The Reason Why The High-voltage Disconnect Switch Cannot Be Operated Even Though The Weld Joint Of The Connecting Rod Is Broken.
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Because the drive chain of hv isolator switch did not disconnect the load or become mechanically jammed after the breakage. The fracture occurred after the connecting rod weld, and the mechanical strength of high voltage electrical isolator had decreased significantly. The transmission mechanism lost its complete power transmission path. However, because the fracture point of the connecting rod of isolator high voltage was located inside the transmission system, the external operating mechanism was still driven by the electric or manual part. As a result, although the mechanical connection was damaged, the protective shutdown was not triggered.
