How is an Acme Drive Isolation Transformer (DIT) different than a General Purpose Transformer?

DITs, as the name implies, are designed to be used with motor drives (AC and DC) and to provide isolation from the service line. They are specifically designed to withstand the “short circuit like” duty imposed by the firing of the thyristors.

Harmonics generated by drives create added loads on the transformer. Therefore, it is important that a transformer of equal or greater KVA to that recommended by the drive manufacturer be installed for a particular motor application.