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Separation Of Ageing And Moisture Impacts On Transformer Insulation Degradation By Polarisation Measurements

By Zheng Tong Yao and Tapan K. Saha


This paper describes an accelerated ageing experiment of transformer oil/paper insulation with preset moisture levels. These samples were tested with return voltage and polarisation/depolarisation measurements. Molecular weight has also been measured with Gel Permeation Chromatography (GPC). Results suggested the impact of moisture on the ageing of oil/paper insulation. An attempt has been made regarding the separation of ageing and moisture on oil/paper insulation using the dielectric polarisation measurements

Topics: transformer ageing, oil paper insulation, moisture and ageing, return voltage, polarisation and depolarisation current, molecular weight measurement, GPC technique, 290901 Electrical Engineering, E1, 660301 Electricity transmission
Publisher: CIGRE
Year: 2002
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