负序功率方向继电器
negative sequence power directional relay
零序功率方向继电器
zero sequence directional relay
三相功率方向继电器
three-phase power directional relay
感应式无功功率继电器
induction type reactive power relay
感应圆盘式定向功率继电器
induction disc type directional power relay
有功无功功率继电器
arbitrary phase-angle power relay
arbitray phase angle power relay
有功-无功功率继电器
arbitrary phase-angle power relay
电动式单相功率继电器
electrodynamic type single phase power relay
电动式三相功率继电器
electrodynamic type three phase power relay