Moisture Aided Degradation of Oil Impregnated Paper Insulation in Power Transformers

Mandlik, Manoj and Ramu, TS (2014) Moisture Aided Degradation of Oil Impregnated Paper Insulation in Power Transformers. In: IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, 21 (1). pp. 186-193.

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Abstract

The presence of moisture in oil impregnated paper insulation (OIP) is detrimental to its long time performance. Until recently, it was thought insulation ageing was only a function of temperature and electrical stress. It has now been realized that moisture in all its forms causes rapid degradation of the electrical and mechanical properties with time. In this study, insulation paper samples were conditioned for desired level of moisture and were impregnated with premium quality transformer oil. The oil impregnated samples with 1 to 3 % moisture content were aged at 90 to 130 C. The indices for determining the extent of ageing considered in this work are degree of polymerization (DP), furan, carbon monoxide and carbon dioxide content. These quantities were monitored throughout the ageing experimental run. End-of-life (EOL) criterion used here is the reduction in the value of DP. Phenomenological models for estimating the service life of insulation are proposed and are validated against actual experimental data.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	copyright for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, NJ 08855-4141 USA
Keywords:	Oil-paper insulation; moisture; temperature; modeling
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 May 2014 07:59
Last Modified:	22 May 2014 07:59
URI:	http://eprints.iisc.ac.in/id/eprint/48867

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