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发明授权
CN101701999B 输电线路故障方向检测方法 有权

输电线路故障方向检测方法
摘要：
本发明提供了一种输电线路故障方向检测方法，包括：步骤100，分别获取输电线路的三个模量电流故障暂态行波的波头极性MMIα，MMIβ，MMIγ；步骤200，分别获取所述输电线路的三个模量电压故障暂态行波中工频分量的初始极性Sα，Sβ，Sγ；步骤300，将所述各模量电流故障暂态行波的波头极性MMIα，MMIβ，MMIγ分别与对应模量的所述电压故障暂态行波中工频分量的初始极性Sα，Sβ，Sγ进行比较，并根据判断结果确定所述输电线路的故障方向。从而解决了长期以来由于电容式电压互感器不能传变电压故障暂态行波的波头而无法构成可应用于实际电力系统的行波故障方向检测元件及行波方向保护的这一难题。
摘要（英）：

The invention provides a method for detecting transmission line fault direction, and comprises: step 100, respectively obtaining wave-head polarities (MMI alpha, MMI beta and MMI gamma) of three modulus current fault transient state travelling waves of a power transmission line; step 200, respectively obtaining initial polarities (S alpha, S beta, and S gamma) of power frequency components in thethree modulus current fault transient state travelling waves of the power transmission line; and step 300, respectively comparing the wave-head polarities (MMI alpha, MMI beta and MMI gamma) of threemodulus current fault transient state travelling waves with the initial polarities (S alpha, S beta, and S gamma) of power frequency components in the three modulus current fault transient state travelling waves, and determining the fault direction of the power transmission line according to the judgment result. The invention solves the long-standing difficulty that travelling wave fault direction detecting elements applied in actual power systems and the travelling wave direction is hard to realize which are caused by capacitive voltage transformer can not transmit and transform the wave-head of voltage fault transient state travelling wave.

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