During the stall-start of a 10KV 900KW motor, arc discharge occurred; the wiring compartment of the high-voltage cabinet was damaged, and the terminals of the arrester were broken. Please...
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In a coal chemical plant, during the stall-start of a 10KV 900KW motor, arc discharge occurred; the wiring compartment of the high-voltage cabinet was damaged, and the terminals of the arrester were broken. What caused the arc discharge? Urgent! Urgent! Urgent!
Dear sea friend, please share the photos of the fault (indicating the area where the arc flash short circuit is most severe); this will help with the fault analysis! However, a simple analysis suggests that the main reasons may be issues with the cable terminations (pay special attention to the cable terminations and conduct voltage withstanding tests on the cables), problems with the arresters themselves (failure to discharge operational overvoltages in a timely manner; perform tests on the arresters), or insufficient safety distances between the indoor components.
Stall start must be caused by overcurrent, right?