HV Equipment

PTTS Power Transformer Test System


The PTTS - Power Transformer Test System is designed for routine testing of power transformers. All supported tests are performed in conformity with IEC 60076 and IEEE/ANSI C57.12.90. Test system consists of a state of the art frequency converter based power supply, a multi-tapped step-up transformer, a capacitor bank and a loss measurement system.

The test system is capable to perform the tests below:

  • Turns ratio
  • Winding resistance
  • Insulation resistance
  • C and tan delta 
  • Partial discharge testing
  • No-Load (iron) loss
  • Load (copper) loss
  • Impedance voltage measurement
  • Induced voltage test
  • Applied voltage test
  • Heat run test
  • On-load tap changer (OLTC) test

The frequency converter is a compact, clean and silent power supply and is used for power transformer testing to replace traditionally used motor generator sets. The possibility to supply at different frequencies independent from the power supply frequency allows testing at 50/60 Hz and also to perform the induced voltage test anywhere between 50 and 300 Hz with the same power supply without any reconnection. Additionally with this elegant solution, a decoupling of the feeding power mains and the self-sustaining test can be achieved and the parameters stability, symmetry, and total harmonic distortion (THD) depend no more on the power mains but from the control structure of the frequency converter.


  • State of the art frequency converter
  • The highest accuracy and completely calibrated and certified measurement system
  • The lowest system noise level allowing highly sensitive partial discharge measurements
  • Modular design for futures expansions 
  • Integrates all routine tests within one unique system
  • Fulfills all international standards (IEC and IEEE/ANSI)
  • Free adjustable test frequency, 40 to 200 Hz
  • Low life-cycle costs and low maintenance
  • Parameters as "stability", "symmetry", and "THD" at best level

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