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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通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。

Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.

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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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