此方法属于单相检测法，先提取电网电流中的某相基波幅值，再将基波幅值乘以与该相电流同相位的正弦波，从而得出该相的瞬时基波电流。

This is a single-phase measurement that multiplies the amplitude of fundamental current of a line by a sine signal which has the same phase with the current.

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在某些情况下，这些波至的残余会叠加在一起给出近于水平的同相轴。

In some cases residuals from these arrivals will stack up to give nearly horizontal alignments.

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地震能量多次反射波的一种类型，表现为一个同相轴。

A type of multiply-reflected seismic energy that appears as an event.

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