Based on a cable (from the motor to the converter cable) insulation damage fault, this article makes in-depth discussion on the internal structure and principle of the inverter, and finds out the causes of abnormal sound and heat of power supply power transformer, which lead to the causes of harmonic wave and its harm in daily work and life, and discusses several commonly used methods to restrain the harmonic wave.%本文从一起电缆（从电机到变频器电缆）绝缘破损的故障引起的，通过深入对变频器的内部结构和原理的探讨，找出造成电源电力变压器异响和异热的原因，从而引申出谐波产生的原因和其在日常工作和生活中的危害，并对抑制谐波的几种常用方法进行探讨。
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