It is known that the steep voltage changes caused byIGBT frequency inverters can cause overvoltage problems at motor terminals and in the motor winding [1,2,3]. Moreover,due to the distributed phase capacitances of the cable, these voltage changes cause a voltage variation in the ground wire[4], which can only be partially eliminated by introducing filters that limit the rate of change of the voltage [5]. This paper investigates, through a number of test measurements,the influence of cable type and cable length on the induced ground wire voltage for most practically applied combinations of ground connections.
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