Low voltage AC motors commonly use circuit breakers for overcurrent and ground fault protection.When the distribution line is long,the impedance of the low-voltage cable is high,and the ground fault current is small,indirect contact protection devices are difficult to meet the sensitivity requirements of ground fault protection.This article combines engineering cases to calculate and analyze the sensitiv-ity of using circuit breakers for overcurrent and grounding fault protection in long-distance distribution lines of low-voltage motors.It also proposes measures to improve the sensitivity of circuit breaker overcurrent protection and other feasible grounding fault protection measures,providing reference for grounding fault protection of long-distance low-voltage motor distribution lines in the future.
关键词
电动机/接地故障/长距离配电/动作灵敏性
Key words
Motor/Grounding fault/Long-distance distribution/Sensitivity to action
维普
万方数据