May 26, 2015 – The handheld ClearTest transformer tester from HD Electric Company provides tests of de-energized power distribution system transformers.

The tester briefly energizes the transformer and takes a snapshot of its condition by measuring the voltage, current and power factor of the test signal.

The transformer defects that it can find 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.