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How to supplement your available voltage supply

  • May 2006
  • Number of views: 3601
  • Article rating: No rating

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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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 7: Electrical Testing

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