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Transformer Turns Ratio (TTR)

The transformer turns ratio test, or TTR test, confirms that the transformer has the correct ratio of primary turns to secondary turns.

Using this test correctly can help to identify tap changer performance, shorted turns, open windings, incorrect winding connections and other faults inside transformers. Megger’s range of TTR testers are robust to withstand the harsh conditions that some transformer testing in. The range includes varying features to simplify and speed up testing as well as 3 phase TTR testers and PT and CT TTR testers.

Megger TTR300 Series

Megger TTR300 Series

Three-Phase Transformer Turn Ratio Test Set

  • Stand-alone or remote-control operation
  • Accurately measures ratio, phase deviation and excitation current
  • Field upgradeable without compromise to calibration
  • Built-in capability for storing and downloading test results in an XML format, via RS-232, Ethernet or USB ports (depending on model)
  • Works in the presence of high interference/high voltage
  • Highest ratio measurement (45,000:1); highest accuracy (0.1%)
  • Displays % error vs. name plate with pass/fail limits

Product details...

Megger TTRU3

Megger TTRU3

True 3 Phase Transfomer Turns Ratiometer 

  • Guaranteed accuracy ±0.05% from -20°C to +50°C
  • 3Ø test voltage - up to 250V
  • 3Ø step up ratio (patent pending)
  • Phase shifting & zig-zag transformers tested easily and accurately
  • Smallest/lightest 3Ø test set on the market
  • Fast 3Ø tests - less than 10 second

Product details...

Megger MWA

Megger MWA

3-Phase ratio and winding resistance analyser

  • Combines TTR and resistance testing in one box - faster, more efficient testing
  • 55% smaller, 40% lighter than individual instruments
  • Only one set of leads required - lighter, smaller and less expensive
  • One test form - easier, faster to complete
  • Built-in demagnetisation

Product details...

Megger TRAX

Megger TRAX

Multifunction transformer and substation test system

  • Replaces need for multiple test sets
  • Saves time by eliminating need for multiple instruments learning
  • User-friendly interface reduces training and testing time
  • Portable and compact system components for easy shipping
  • State of the art measurement methods for advanced diagnostic testing

Product details...

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