A new virtual calibrator for instrument transformer is presented. A phase difference correction method is applicable to correct electronic instrument transformer.

介绍了一种新型的虚拟互感器校验仪，它采用相位差校正法解决了校验电子式互感器的问题。

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In this paper, a phase difference correction method is presented to correct the power frequency. This method has strong anti-disturbance capability by theoretical analysis and simulation.

理论分析和仿真表明这种方法具有较强的抗干扰性，其频率测量精度主要与信噪比、频率偏差及采样数据的长度有关。

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Compared with the original two kinds of Phase-Difference Correction, only one sequence of time-domain signal is sampled and FFT analysis of same points is performed twice in this method.

与原两种相位差法相比，这种方法只采一段时域信号，且进行两次相同点数的FFT分析。

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