Common Electrical Tests on Power Transformers

Regularly performing a range of standard electrical tests has proven to be an effective method for gaining reliable insights into a transformer's operational condition that can extend its lifespan.

These conventional testing methods include measuring various parameters, such as short circuit impedance, transformer ratio, magnetizing current, demagnetization, winding resistance, and insulation resistance. Our testing solutions offer you singular devices that determine all these parameters with ease.

Benefits of this solution

One system – multiple tests

With TESTRANO 600 you can measure transformer turns ratio, DC winding resistance, dynamic resistance, leakage reactance / short-circuit impedance and frequency response of stray losses as well as demagnetize your transformer.

Easy and fast testing setup

All these tests can be performed with one common setup and, if applicable on all three phases simultaneously. Thus, TESTRANO 600 cuts down testing time to one third.

Flexible operation

TESTRANO 600 can be flexibly operated using TESTRANO TouchControl on the integrated display, or by using a laptop with the Primary Test Manager software.

Powerful and compact

The three integrated sources ensure measurements with high accuracy and make it a powerful system (3 x 33 A DC and 400 V AC). With a weight of just 20 kg / 44 lbs, it is ideal for on-site and FAT testing.

CT Analyzer

The working principle of CT Analyzer is that of low power injection into the secondary side of the CT. Doing so, it determines the CT‘s equivalent circuit parameters and identifies all relevant CT performance parameters. It displays all relevant parameters of the CT and its accuracy at different currents and burdens. The CT is evaluated according to the selected standard and unknown CT nameplate parameters are determined. After the test the CT is demagnetized.

CT Analyzer

Current transformer testing, calibration and assessment

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CPX 200 + HVX10

The CPX 200 simplifies power transformer measurements with easy wiring, reducing testing time and enhancing safety. It features integrated tap changer control for measurements across all tap combinations, as well as true three-phase voltage output for precise voltage and transformer turns ratio measurements. Continuous winding resistance tests can be performed with up to 100 A DC for accurate results.
CPXpert automates testing workflows for up to three-winding transformers across all conventional vector groups, providing advanced tools for streamlined analysis and improved efficiency.