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.

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.

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.

CPC 100

Universal primary injection test set for substation assets

CP SB1

Switch box for fully automatic testing of three-phase power transformers

Primary Test Manager (PTM)

Diagnostic testing, condition assessment and data management of medium and high-voltage assets

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CT Analyzer: Current transformer (CT) analysis with the push of a button

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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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.