Although fault component current phase selector has excellent performance for single transmission lines, it may select unwanted phase for cross-country faults in double-circuit lines on a same tower.
相电流差突变量选相元件在单回线故障中具有良好的选相性能，但在同杆双回线跨线故障中可能误选相。
2
The fault phase selectors, including the phase current difference suddenly-change and the sequence current, may misoperate in some crosscountry faults and conversion faults.