go to the Transformer service product page Anonymous asked on Dec 26th, 2013 in Transformer service

How do you calculate moisture content in a transformer?

Andre Steinberg, Marketing and Sales Manager

ABB's answer

Water content in oil is measured in ppm by taking an oil sample, and applying the Karl Fischer method either in a lab or with a suitable portable device on site. The moisture content of the insulation paper of the windings is measured by conducting a DFR test (Dielectric Frequency Response), a result represented as a percentage. There are few curves to help predict moisture content in windings by measuring the moisture content in the oil only.


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Area expert

  • Andre Steinberg

    Andre Steinberg

    Marketing and Sales Manager

    Transformer service

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