Chuck Yung
EASA Technical Support Specialist
When a service center’s test panel is designed with a limited number of incrementally stepped voltages, there are times when you need a voltage that is not available. In such cases, when you need a non-standard 3phase voltage, one workaround is to use a 3-phase motor as an autotransformer. This works to step down, or to step up, the available voltage.
There are three key safety considerations here:
- Never energize part of a winding with more than the voltage that portion of the winding is subject to during normal operation.
- Do not exceed the voltage rating of the ground insulation.
- Select a motor that can handle the no-load current of the motor to be tested.
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