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DV-Power TRT Advanced Series True Three-Phase Transformer Turns Ratio Tester

Advanced True Three Phase Transformer Turns Ratio Tester with Large Colour Touch Screen

TRT advanced series instruments are true threephase, fully automatic test devices specially designed for turns ratio, phase shift, and excitation current measurements of power, distribution and instrument transformers. TRT advanced series instruments determine the transformer turns ratio by applying voltages across high voltage windings, accurately measuring voltages across the unloaded transformer windings, and then displaying the ratio of these voltages. TRT advanced series instruments are based on a state of the art technology, using the most advanced technique available today. The test set can be used to test single-phase and threephase transformers, both with and without taps in accordance with the requirements of the IEC 60076-1 standard.
For a three-phase measurement, the test set is connected to all the three phases of a transformer to be tested. If specific vector diagrams are selected for different types of transformers, the TRT will run a specific test for each transformer type (i.e., single phase, Delta to wye/star, Wye/Star to delta, Delta to delta, Wye/Star to wye/star, Delta to zig-zag, etc.) without a need to switch the test hookup cables. In addition, it can perform the test with true three-phase test voltage, allowing testing any transformer type. Following the test, it
displays a turns ratio, phase shift, and excitation current obtained with single-phase and/or true three-phase test voltages.


• Single-phase test voltages up to 500 V AC
• True three-phase test voltages up to 3x290√3V AC
• Up to 5 kV AC with additional CVT20
for testing capacitive voltage transformers
• The best turns ratio accuracy of 0.03%
• Large 10.1” or 7” graphical touch screen display
• Automatic vector group detection
• Built-in tap changer control unit
• Interchangeable test leads with Three-phase
Winding Ohmmeters & Tap Changer Analyzers TWA Series

Transformer Testing


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