Evaluation of Loss in Transformers and Reactors Designed for Use in High-Voltage Circuits


Measuring power loss in transformers and reactors for high voltage circuits requires high voltage measurements. In addition, transformers and reactors are low power factor devices. When the power factor is low, phase error greatly affects the measured value, so it is essential to measure power with minimal phase error.


  • (Measurement Example) Reactor Power Loss Measurement

The VT1005 can be used with a power analyzer PW8001 to measure the efficiency of inverters that use SiC power devices.

High-Voltage Measurements

The VT1005 allows power analyzers to measure voltages of up to 5000 V.

Measurement Category

  • 5000 V rms (±7100 Vpeak) No measurement category
  • 2000 V rms CAT II
  • 1500 V rms CAT III

Measurement of High-Frequency Components

The VT1005’s measurement band is DC to 4 MHz, allowing it to measure voltage from DC to high frequencies.In addition, the excellent flatness of the amplitude and phase characteristics in the measurement band enables highly accurate power measurement.

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