由于电网中非线性设备的使用日益增多，所产生的高次谐波电流大量注入电力线路中，使得电网电压、电流波形发生畸变。
Since more and more nonlinear equipments have been used in the power supply network, the generated high harmonics current leads to waveform distortion of voltage and current in the supply network.
另外，由于物体的介入，电场会发生了畸变，特别是输电线路附近的建筑物使输电线路周边的电场畸变。
In addition, the intervention of other objects will make the electric field aberrant, especially electric field around the transmission lines nearby the buildings.
比较故障线路和正常线路波形，使两波形相减，利用波形差第一个畸变点来确定故障距离。
Contrasting the waves reflected from the fault line and the normal one, and subtracting this two waveforms, then the fault distance is determined by finding the first distortion point.
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