Raytech TR-Spy Mark II Units for Three Phase TTR Testing at its Best

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The Raytech TR-Spy Mark II and Mark III units have become recognized as the World’s most advanced Three Phase Transformer Ratiometers.

Rugged, lightweight instruments that automatically measure Turns Ratio, Voltage Ratio, Excitation Current, Phase Relationship, and Phase Displacement, the Raytech TR-Spys are fully automatic instruments that can perform precision laboratory measurements, as well as function extremely well in the field for routine maintenance testing.


Raytech TR-Spy Mark II features:

  • Automatic Three Phase TTR
  • Select transformer type using simple user interface
  • Measure voltage/turns ratio, current and phase displacement
  • Store 100 test results on unit or export using RS-232 interface
  • Ratio Measurement of .08 to 13000 turns
  • Five test voltage ranges – 1V, 10V, 40V, 100V and Automatic
  • Automatic phase vector detection



Raytech TR-SPY Mark III features:


  • Automatic measurements of voltage, turns ratio, current, and phase displacement
  • Easy one time hook up to the transformer
  • Automatic test voltage range
  • Displays deviation from a nominal ratio
  • Load on test object <0.05 VA
  • Displays % error vs. name plate value
  • Automatic phase vector detection
  • Data storage of over 10,000 measurements


With offices in Texas, Illinois and New Jersey, Protec offers a full stocks of electrical test and measurement equipment.


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