Overheating of the conductive circuit of the high-voltage isolating switch

During the operation of the power system, abnormal heating of the High Voltage Disconnect Switch conductive circuit is a common phenomenon. This is mainly due to the fatigue and deterioration of the static contact finger compression spring. At the same time, the one-sided contact of the static contact finger and the increase in contact resistance caused by long-term operation are also important factors. During operation, the elasticity of the static contact finger compression spring gradually deteriorates due to long-term pressure. When the working current is large, the temperature rise exceeds the allowable range, which leads to a vicious cycle and may eventually cause serious burning of the contact. In addition, process problems of the silver plating layer of the contact, easy wear and exposure of copper, dirty contact surface, insufficient contact insertion, and reduced pressure on the contact surface of the wire clamp caused by bolt corrosion are also important factors leading to heating problems.