单相短路电流
Single-phase Short-circuit Current
电子管功率定向继电器
electronic valve type power directional relay
感应式功率定向继电器
induction type power directional relay
感应圆盘式定向继电器
induction disc type directional relay
压降补偿式定向继电器
voltage drop compensation directional relay
弱电流继电器电路
low current relay circuit
微型电路继电器
miniature circuit breaker