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。

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

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构造了新型的用于高压输电线路保护的故障选相元件。

A new faulty phase selector for high voltage power transmission system is presented.

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当电力系统发生故障时，系统中的保护装置动作，将故障线路或元件切除。

When a fault occurs in power system, the relevant relay will operate and send out trip order to clear the faulted transmission line or other parts.

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