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20. The Effect of Moisture and Temperature on Partial Discharge Behavior in New and Aged Oil/Pressboard Insulation System.

Author

Karimi, Milad, Akmal, Amir Abbas Shayegani, Alamati, Benyamin, and Mohseni, Hossein

Subjects
ELECTRIC insulators & insulation, ELECTRIC discharges, MOISTURE, TEMPERATURE effect, ELECTRIC transformers, CELLULOSE, ELECTRIC potential
Abstract

This paper presents an investigation of partial discharge (PD)behavior in oil-impregnated new and aged, wet and dried pressboard insulation system at both ambient (around 20°C) and the hottest temperature of transformer normal operation (around 90°C). The main idea of this investigation is to study the impact of specific conditions such as those occur in practical cases in oil type transformers, on the variation of moisture and temperature. Temperature is a major cause of deterioration and aging of cellulose insulation. On the other hand, moisture equilibrium in oil/pressboard insulation is dependent on temperature and the estate of power transformer. The dynamic of moisture transfer from oil into pressboard and vice versa according to the variation of temperature affects partial discharge inception voltage (PDIV) and phase resolved PD (PRPD) patterns. [ABSTRACT FROM AUTHOR]

Published
2012

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