HD Electric Transformer Testers – ClearTest®

HDE Transformer Testers – ClearTest®

The ClearTest® Transformer Tester 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 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.

The ClearTest 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 looks both inside and outside the transformer – testing the coil, core and winding as well as between the transformer and whatever it is connected to.


-Finds internal transformer defects before energizing
-One tester for all transformer types
-Test the primary and secondary sides of de-energized transformers without disconnecting
-Tests all connections from transformer to meter
-Improve SAIDI statistics by quickly testing and getting the transformer back in service
-Prevents line workers from installing a fuse on a shorted transformer
-Quickly verifies the secondary connections are not shorted
-Compact, lightweight and easy-to-use
-Powered by two 9V field replaceable lithium or alkaline batteries
-Audible alarm confirms successful test
-Built-in self test
-A magnet is included to hold the ClearTest in place while testing

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