Discussion
An output reactor or dv/dt filter on a drive is used chiefly to
Answer: C
Correct answer: protect the machine insulation on long cable runs
A fast switching edge travelling down a long cable reflects at the machine terminals, and the reflection can nearly double the voltage seen by the first turn of the winding. Repeated at the switching frequency, that overvoltage erodes the insulation. A reactor or dv/dt filter slows the edge so that the reflection does not build.
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