输电线路高频方向保护误动作原因分析

Analysis of High-frequency Direction Protection Misoperation Cause

高压输电线路均采用能瞬时切除全线故障的纵联保护,采用载波通道的高频方向保护在现场应用十分广泛。由于高频方向保护的重要性,它的误动作将产生严重的后果。通过一次输电线路高频方向保护的误动作故障,分析了闭锁式高频方向保护动作的原理、误动作的原因及防范措施。

High-voltage transmission lines are used to instantaneous removal of pilot protection fault line, using high-frequency cartier channel directional protection is widely used in the field. As the importance of protecting high-frequency direction, its malfunction have serious consequences. By one high-frequency direction by a transmission line failure malfunction protection, it analyses the principle of protection operation on blocking high-frequency direction, the causes of malfunction and preventive measures.