Water and Energy Abstracts
Year : 2004, Volume : 14, Issue : 1
First page : ( 41) Last page : ( 42)
Print ISSN : 0021-1672.

113. Understanding Moisture in Transformer System

Khandhediya Dipen

(IEEMA Journal, December 2003, pp. 45–47).

Abstract

Power transformers are capital intensive and critical for Utility industries. Most of the transformers used in industries are oil filled type. The primary insulation system used in oil filled transformer is Kraft paper, Wood, Porcelain and oil. Presently chemically treated paper is used in transformer winding insulation to improve its tensile strength property and resistance due to decay caused by immersion in oil. The average life of a transformer in India is 25 to 30 years. A failure occurs in the transformer when the insulation system becomes weak to the extent that, it can no longer act as an insulator to the high voltage to which it is subjected. Various studies on transformer failure show that 73% of transformer failures are caused by insulation breakdown. Therefore, the key for extending the life of a transformer is to keep insulation in good condition. In order to maintain the quality of insulation we must understand the reasons for its degradation. Following are the listed factors which adversely affect the insulation properties: Voltage transients; Heat; Dirt; Insulating oil degradation; Moisture; Oxygen. In this article effect of moisture on insulation property and its measurement methods are discussed.

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Keywords

Power transformers, Insulating oils, Effect of moisture on transformer.

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