基于六序故障分量的同杆双回线路横差方向保护

Transverse Differential Protection of Double-circuit Lines on Same Tower Based on Six-sequence Fault Components

针对传统的采用非故障相相间电压作为参考向量的横差保护选线元件存在的缺陷,提出基于六序故障分量的同杆双回线路横差方向保护方法,它将相故障分量分解为六序故障分量,同时消除了相间互感和线间互感,实现了故障的解耦。基于六序故障分量的横差保护不受故障点位置及两侧电源相角差的影响,能够有效提高保护的可靠性。

Aiming at the shortcomings of the traditional transverse differential protection using the non-fault phase voltage as the reference vector,it proposes a new transverse differential protection method of double-circuit lines on same tower based on six-sequence fault components.The method decomposes the phase fault component into six-sequence fault components,so it could eliminat the coupled inductance and achieve the fault decoupling.Because transverse differential protection based on the six-sequence fault components would not be affected by the location of the fault and the phase angle difference of power supply in both sides,it can effectively improve the reliability of protection.