Dissipation/Power Factor Measurement (Tan Delta) on Instrument Transformers

One of the most common causes of an instrument transformer malfunction is an insulation failure. Moisture ingression due to broken seals, or heat caused by the ambient temperature or sunlight, accelerates the insulation's aging process and influences its condition.

Older insulation can lead to high losses in the instrument transformer, which generates further heat. Since instrument transformers are not actively cooled, old or degraded insulation can result in a failure or even an explosion. Fragments from the explosion represent a serious hazard for persons in the substation as well as for other equipment.

Measuring the dissipation/power factor (tan(δ) delta) allows you to determine the condition of the insulation. When you use our testing systems, you will also be able to determine the dissipation factor at various frequencies and detect any signs of aging at an early stage. Therefore, an instrument transformer can be replaced before any further damage occurs.

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