一起同杆并架线路异名相跨线故障保护动作的分析

介绍一起罕见的同杆并架线路异名相跨线故障及相关线路保护的动作情况。通过保护动作报告和故障录波,分析确定了故障类型和故障地点,结合继电保护原理对线路保护的动作行为进行了详细分析。指出了在复杂故障下,普通高频保护装置因选相元件的原因仅能保证切除故障而无法确保选择性。针对同杆并架线路的雷击问题,从一次和二次方面提出了应对措施。

Analysis on Protection Action for Out-phase Overline Fault of Double Circuits on Same Tower

An rare out-phase overline fault of double circuits on the same tower and the action of relay protection are described.The fault type and location are confirmed based on relay protection action report and fault recorder.The action of circuit protection is analyzed in detail combined with the relay protection principles.This paper indicates that common high-frequency protection devices can only remove the fault while it cannot guarantee correct selection because of the faulty phase selector when a complicated fault occurs.And the countermeasures are provided to deal with the problem of double circuits on the same tower caused by lightning strike.