T&D World Magazine
transformer tester

Device Tests De-energized Distribution Transformers

It is a handheld device with a single pushbutton that provides a clear indication of open circuits, short circuits, including shorted turns or shorted windings and confirmation that the test results are OK.

The ClearTest Transformer Tester from HD Electric Co. provides quick and easy tests of de-energized power distribution system transformers. It is a handheld device with a single pushbutton that provides a clear indication of open circuits, short circuits, including shorted turns or shorted windings and confirmation that the test results are OK.

The ClearTest Transformer Tester is a completely new design that briefly energizes the transformer and takes a snapshot of the transformer condition by measuring the voltage, current and power factor of the test signal.

Finds transformer defects that include:

  • A single shorted turn in the primary or secondary side of a transformer
  • Open coils or blown internal fuses or breakers
  • Partial shorts including shorted turns, shorted turn layers, coil to core shorts and primary to secondary shorts
  • Bad transformer ratios resulting from shorted turns

ClearTest Transformer Testers look both inside and outside the transformer - testing the coil, core and winding as well as between the transformer and whatever it is connected to.

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