In power system, it can excite partial parallel resonance or serial resonance, enlarge the harmonic wave, trigger relay protection system in error and disturb electric power energy metering equipment.

在电力系统，它可以刺激局部并联谐振或串联谐振，放大谐波，引发继电保护系统误差和扰乱电力能源计量设备。

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PT secondary voltage step-down is one of the reason which causes the comprehensive error of the electric energy metering equipment.

而PT二次压降又是引起电能计量装置综合误差的直接原因之一。

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