Power transformers are critical components in the transmission and distribution infrastructure. Failures can wreak enormous costs in power outages, unscheduled maintenance, and damage to equipment. Effective testing can save significant time and money. Two important tools for transformer maintenance are available; one established method and one groundbreaking 21st century technique.

TRANSFORMER TURNS RATIO The long-established and proven method is transformer turns ratio (TTR) testing. The rating (performance) of a transformer depends on the ratio between the primary (input) and secondary (output) windings. As the winding turns with increased frequency, resistance increases, along with the voltage, at the cost of current.