Transformer Testing: Dielectric Frequency Response(DFR) What is DFR? Dielectric Frequency Response(DFR) analysis, is mainly used to assess the moisture content of the cellulose insulation. Moisture in oil-paper insulated power transformers is due to ingress via leaky seals
High Voltage Testing and Partial Discharge In GIS Overview Insulation integrity testing in GIS is realized using Power Frequency over voltage withstand and Partial Discharge(PD) measurements. PD testing has become a widely accepted method for
DC Insulation Resistance (IR) DC Insulation Resistance (IR) is a universally accepted diagnostic test for insulation assessment. It has been in use for more than 75 years. The IR test measures the resistance of the
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