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Transient and Permanent Faults Identification on Parallel Transmission Lines

The phase voltage of the tripping phase contains capacitive coupling voltage and inductive coupling voltage. According to the continuous improvement of the national voltage grade, the parallel transmission lines on the same tower are widely used in main transmission section. The protection will trip the fault phases while inner-line or inter-line faults occur. The phase voltage of the tripping phase contains capacitive coupling voltage and inductive coupling voltage. Terminal voltage when the lines are in transient faults is much higher than in permanent faults because of the line discharging by fault point. Simulation studies show that the terminal voltage criterion can distinguish transient and permanent fault in parallel transmission lines.