Phasor measurement unit(PMU)based on GPS is a new and precise measuring device, which can be used to measure bus voltage phasor and branch currentphasor.
The time harmonic voltage and current wave propagation along a transmission line can readily be transferred from frequency domain voltage and currentphasor distribution along the line.
由传输线上电压及电流沿线分布之频域相量，可转换为传输线上各频率成份弦波电压及电流沿线之时域传播。
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The wiring correctness of differential protection current loop can be verified by using phasor analyzing method and on load test method. These two methods were described.