Power Factor/Dissipation Factor (Tan Delta) and Capacitance Measurements on Power Transformers

The condition of the insulation is essential for secure and reliable operation of your transformer. Measuring capacitance and dissipation/power factor helps you to determine insulation condition in bushings or between windings.

Changes in capacitance can, for example, indicate mechanical displacements of windings or partial breakdown in bushings. Aging and degradation of the insulation, coupled with the ingress of water, increase the amount of energy that is converted to heat in the insulation. The rate of these losses is measured as dissipation factor.

With our testing systems, you can even determine the capacitance and dissipation/power factor at variable frequency. Therefore, aging phenomena can then be detected earlier, and corresponding action such as repair, oil treatment or drying can be initiated.

Benefits of this solution

Optimized power transformer test system

With TESTRANO 600 + CP TD12/15 you can measure transformer turns ratio, DC winding resistance, leakage reactance / short-circuit impedance, dissipation/power factor and demagnetize your power transformer.

Increased measurement sensitivity

The frequency sweep from 15 Hz to 400 Hz increases the sensitivity of the test, improving insulation condition assessment and detecting defects at an early stage.

Powerful CP TD12/15

The CP TD12/15 includes a high-voltage source (12 kV/15 kV, 300 mA), a reference capacitor and measurement electronics. It achieves laboratory precision even in environments with strong interferences.

Ideal for on-site testing

Both components, TESTRANO 600 and CP TD12/15, can be mounted on a trolley, which makes it easy to transport and thus ideal for on-site testing. With a weight of just 20 kg / 44 lbs, it is ideal for on-site and FAT testing.

TANDO 700

The portable TANDO 700 system offers high-precision measurement of dissipation/power factor (Tan Delta) and capacitance for high-voltage laboratory tests, such as routine and type tests, on various electrical assets. TANDO 700 also measures additional parameters such as power, current, voltage, impedance and frequency. TANDO 700 software shows you all measurement data in real-time, displays related trends and enables you to create customized reports.

TANDO 700

High-precision capacitance and dissipation/power factor measurements

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CPX 200 + HVX10

CPX 200 and HVX10 can be combined to perform capacitance and power/dissipation factor measurements on power transformers with up to 10kV AC. This optimized sweep combines voltage and frequency sweeps, testing transformer insulation or bushings from 1 Hz to 600 Hz, providing insights about insulation moisture and voltage dependency effects that align with IEC and IEEE standards.

CPXpert reduces wiring efforts by utilizing the HVX10's four integrated measurement channels to wire all bushings per voltage level in a single setup. This setup can also be used for Insulation Resistance measurements.

CPX 200

A compact multifunctional testing device for commissioning, maintenance and condition assessments of medium and high voltage assets.

HVX10

Mounting kit for 19-inch racks

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DIRANA + PTM

DIRANA uses Dielectric Frequency Response (DFR) analysis to assess the condition of power transformer insulation systems. It measures capacitance and the power factor/dissipation factor across a wide frequency range, from 10 µHz to 5 kHz, at a maximum output voltage of 200 V peak.

This measurement not only provides information about the insulation system's moisture content and oil conductivity, but also delivers additional valuable parameters such as insulation resistance, polarization index (PI), and dielectric absorption ratio (DAR).