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中文摘要：
故障支路电流序分量之间的相位关系包含了明确的故障相别信息，但易受电流分布系数的影响。差电流中的负序分量的相位与故障支路中负序电流的相位相同：在差电流中的正序分量中减去系统电源产生的正序电容电流，修正后的正序差电流的相位与故障支路中的正序电流相同；通过负序差电流和修正后的正序差电流之间的相位关系可以明确判断故障类型。该选相元件不受线路分布电容、线路补偿电抗器、电流分布系数的影响，可在故障后长期使用，灵敏度高。仿真实验数据验证了该选相元件可以正确地选出故障相别。
英文摘要：
The phase relationship between the positive sequence and negative sequence components of faulty branch current contains clear information of fault,but it is easily influenced by the current distribution coefficient. The negative sequence component of differential current is inphase with that of faulty branch current. After the positive sequence component of differential current is subtracted by the positive sequence capacitive current caused by system power sources,it becomes inphase with the positive sequence component of the faulty branch current. The faulty phase can thus be selected according to the phase relationship between the positive sequence components of modified differential current and the negative components. Being highly sensitive and available during whole fault period,the proposed phase selection element is immune to the distributed line capacitance,line compensation reactor and current distribution coefficient. Simulative results show its validity.
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