Common Electrical Tests on Power Transformers

Regularly performing a range of standard electrical tests has proven an effective way to gain a reliable insight into the operating condition of your transformers and can extend their lifespan.

These conventional testing methods include measuring a number of parameters, such as the short circuit impedance, transformers ratio, magnetizing current, winding resistance and dynamic winding resistance of the tap changer. With our testing system, you can use a single device to determine all of these parameters in an easy way. Once you have completed the testing, you can also demagnetize the transformer.

Expert recommends


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.

TESTRANO 600 provides you with a convenient way of testing to gain a comprehensive insight into the condition of every part of your power transformer. It can be operated using TESTRANO TouchControl on the integrated display, or by using our Primary Testing ManagerTM software on your laptop. This makes it ideal for routine and diagnostic testing onsite or during factory acceptance tests (FAT).

Benefits of this solution

Other solutions

CPC 100 + CP SB1 + PTM

CPC 100 in combination with the accessory CP SB1 simplifies measurements of three-phase power transformers. It reduces wiring work, thereby the time needed for testing can be reduced and at the same time, safety can be significantly increased.

The transformer ratio and winding resistance are automatically measured in all three phases (in sequence) in all tap changer positions. The measurement results are recorded by the CPC 100 and can be analysed with the accompanying Primary Test Manager™ (PTM) software.

Other solutions

CT Analyzer

Working principle of CT Analyzer:

  • Injects low test signals into secondary side of the bushing CT
  • Determines the bushing CT‘s equivalent circuit parameters
  • Identifies all relevant bushing CT performance parameters
  • Displays all relevant parameters of the bushing CT and its accuracy at different currents and burdens
  • Evaluates the bushing CT according to the selected standard
  • Determines unknown bushing  CT nameplate parameters
  • Demagnetizes the bushing  CT after the test

Other solutions

CPC 100

The patented test system replaces numerous individual testing devices and offers new, innovative testing methods. This makes testing with the CPC 100 a timesaving and cost-effective alternative for conventional testing methods. Despite its expansive capabilities, the CPC 100 is very simple to use.

The powerful testing device provides up to 800 A or 2 kV (2 kA or 12 kV with accessories) with up to 5 kVA over a frequency range of 15 Hz to 400 Hz or 400 ADC.

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