功率倒向对平行双回线纵联保护的影响分析及对策

平行双回线中一回线路出现内部故障，由于两侧开关切除不同时，在切除故障期间非故障线路可能出现功率倒向现象。纵联保护往往因为闭锁信号或者允许信号在时间配合上出现问题而导致保护误动。文中就某一500kV电网上出现的具体故障，深入分析了功率倒向引起纵联保护误动的原因，并提出了相应的解决措施。

Analysis on the Influence of the Power Converse to the Double-circuit Transmission Lines Pilot Protective Relaying and Its Corresponding Measures

For double-circuit transmission lines, when the two circuit breakers of fault transmission line trip sequentially to immune from its internal faults, the power direction of the sound line may change between forward direction and backward direction. During the changing of the power direction, the imparity of blocking signal or permissive signal may lead to the maloperation of pilot protection in the sound line. An actual fault in 500 kV power network is provided. The reason of the maloperation is analyzed in detail and the corresponding measures are proposed.