通过测量用户低压侧三相电流相量，通过特定的算法处理，准确判定用户高计TA的实际变比是否与铭牌一致。
Through measuring three-phase current of low voltage at user side and handling by specific algorithm, TA ratio of HV measuring can be accurately judged whether is consistent with data plate.
基于GPS的同步相量测量单元（PMU）是一种新型的高精度测量装置，能够测量母线电压相量和支路电流相量。
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 current phasor.
该方案通过电流矢量空间角判断感应电机三相定子电流正负，推导出三相定子电压的补偿量。
This scheme utilize the current vector space Angle to judge the three stator current polarity, deduce the three stator voltage compensations.
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