In the final, process the actual test low frequency and middle-frequency electric voltage and current data, attains the accurate result and verifies the accuracy of the method.

最后，对变频调速电机的实际低频与中频电压、电流信号进行了分析，得出了正确结果，验证了该方法的有效性。

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Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.

ECONOMIST: Monitor