Power Factor / Grading Capacitance Measurement

Measuring the power factor, or the dissipation factor, also known as the tangent delta (tan δ), provides effective means for verifying the integrity of the insulation condition of circuit breaker components. In particular, the insulation condition of dead tank high voltage breaker bushings should be verified with this measurement. On dead tank breakers this measurement method is used to verify the insulation condition of the bushings by detecting deterioration in capacitive layers. On life tank high voltages breakers this measurement method is used to evaluate the capacitance of grading capacitors. If the measurement is performed outside of mains frequency, interferences from nearby live station components can be filtered out and minimized. Measuring over a range of frequencies provides better insight into the insulation condition.

Benefits of this solution

High output voltage

A high voltage source generates output voltages of up to 12 kV.

High accuracy

A reference capacitor, measurement electronics and frequency sweeps minimize interferences from nearby live station components and provide better insight into the insulation condition.

Ideal for on-site testing

Testers can move the two main components CPC 80 and CP TD12 either mounted together on a single measurement trolley or separately in their respective trolley transport hard cases.

CPC 100 + CP TD12

The CPC 100 is a multifunctional device that can be used to test many substation elements, such as instrument transformers, power transformers, station grids, or circuit breakers. Measuring at frequencies ranging from 15 Hz to 400 Hz, the combination of CPC 100 and the CP TD12 provides great insight into the insulation condition of high voltage components.

CPC 100

Universal primary injection test set for substation assets

CP TD12/15

Module for capacitance and power/dissipation factor (tan delta) measurements

TESTRANO 600 + CP TD12

The TESTRANO 600 can be used to comprehensively test power and distribution transformers, that can measure at frequencies ranging from 15 Hz to 599 Hz. When combined with the CP TD12, the device can provide great insight into the insulation condition of high voltage components.