However, Pulse Width Modulation (PWM) which was input from inverter is characterized by steep rising edge and high frequency, resulting in the too early failure of motor insulation.
然而，逆变器输出的PWM(脉冲宽度调制)连续高压脉冲的上升沿很陡、频率很高，导致在脉冲电压下牵引电机绝缘过早失效。
The width of the reflection pulse is increased and its amplitude reduced as the rise time of incident wave delays, which may to some extent be good for the detection of insulation faults.
入射波上升时间增长，反射脉冲变宽，幅值降低，但一定程度上有利于检测出绝缘故障。
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