Testing, diagnosis and rectification of high dissipation factor in large power transformer

Somil Joshi, Girish Pathak

Abstract

Power transformer are high-priced and major device in electrical power system. Their overall healthiness and operating life is primarily dependent on insulation system. Insulation system of transformer is complex electrical network comprising series and shunt capacitance. These capacitance comprises of insulating components like oil, wood, paper and pre compressed boards (PCBs). As these materials are hygroscopic and moisture prone. Hence fault identification and rectification in insulation system becomes critical. There are several methods available for accessing the power transformer insulation. This paper demonstrates a practical experience, methodology of testing and diagnosis. Through testing components responsible for high dissipation factor were identified. The diagnostic technique helped in swift and economical replacement of faulty insulation components. Thus, high dissipation factor problem rectified and transformer was restored back to service

Keywords

Transformers, insulation systems, dissipation factor, capacitance, winding

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IMEKO-TC10-2020-023.pdf

DOI

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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