Three-phase test system for comprehensive power transformer testing

Powerful and compact solution

TESTRANO 600 is the world’s first portable, three-phase test system which supports all common electrical tests on single- and three-phase power and distribution transformers for routine and diagnostic testing on-site or during factory acceptance tests (FAT).

Using TESTRANO 600 enables you to perform various tests on power transformers without re-connecting. Thus, TESTRANO 600 cuts testing time down to one third compared to conventional single-phase test sets.

Simplified and Faster Testing

Safety First

TESTRANO 600 follows the “safety first” principle and fulfills the highest safety standards by providing an emergency stop button, safety and warning lights, as well as offering optional safety accessories.

Three-phase Testing Approach

TESTRANO 600 energizes all three phases at once allowing simultaneous testing of all three phases, for example, transformer turns ratio with 400 V L-L or winding resistance with 33 A. Ultimately leading to reduced rewiring effort and shorter testing times.

Intuitive Connection

TESTRANO 600 offers custom-designed connector plugs as well as a dedicated color code on the side panel and on the cables. Both ensure safe and reliable measurements and leave almost no room for connection errors.

Active discharge

The active discharge function automatically discharges the winding within a matter of seconds, for example, after resistance measurements have been performed. This guarantees a high level of safety during testing and also reduces testing time.

Key Features

  • True three-phase power transformer test system
  • Powerful device with 3 x 33 A DC or 400 V AC
  • Reduced connection effort as the same connection can be used for various tests
  • Three times faster testing
  • Total weight of 20 kg / 44 lbs – ideal for on-site testing

One System for Multiple Tests

Just three cables need to be connected to perform various tests with TESTRANO 600: 

  • Transformer Turns Ratio
  • DC Winding Resistance
  • Dynamic Resistance
  • Demagnetization
  • Short-Circuit Impedance / Leakage Reactance
  • Frequency Response of Stray Losses
  • OLTC Scan / Dynamic Resistance (DRM)
  • Vector Group Check
  • Cooldown Test
  • Power Losses at Low Voltages


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