Electrical products which have LCD time counter, Layer sensor, Three-phase AC fault protection relay and so on.

其中电器类产品有液晶显示计时计数器、平层感应器、断相错相三相交流保护继电器等等。

youdao

This paper presents that the protection for the phase to phase fault should be composed of high frequency teleprotection channel and overreached distance relay.

提出只有将高频通道、超范围距离元件配合构成允许式纵联距离保护，才能保护同杆双回线跨线不接地故障。

youdao

Theory analysis and simulation results show that the new phase selector can determine fault types properly and be used in transmission line protective relay.

理论分析和仿真计算表明，使用电压量的选相元件能够正确地判别各种故障类型，满足高压线路保护的需要。

youdao