反向电源继电器选择
reverse power relay option
反向电源随动继电器
reverse power slave relay
rpsr
反向过流继电器
reverse overcurrent relay
整流器反向电压
inverse voltage of rectifier
正向-反向电子解算器
forward-inverse electronic resolver
低电压方向继电器
directional under voltage relay
电子管功率定向继电器
electronic valve type power directional relay
负序功率方向继电器
negative sequence power directional relay