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Investigation of the long term degradation of cellulosic insulating materials in high voltage power transformer

NIHAT PAMUK1,*

Affiliation

  1. Turkish Electricity Transmission Company / 54100 - Sakarya, Turkey

Abstract

Power transformer is one of the most expensive and strategically significant components of any power system, so that they are crucial parts of high voltage energy generation and transmission systems. Therefore their function is essential to power system reliability. This paper presents the life and long term degradation of oil impregnated cellulosic insulating materials used in power transformers. The purpose of this paper, changes of mechanical and dielectric strength of cellulosic insulating materials was examined by accelerated aging experiment for one year. Then, cellulosic insulating materials used in large capacity power transformers which had been operated for several years and up to 20 years were investigated. One of the results derived from the above examination and investigation is such that the mechanical characteristics of cellulosic insulating materials have been degraded down to approximately 50 percent of the initial value through operating for 20 years whereas electrical characteristics are less degraded..

Keywords

Power Transformer, Insulation Degradation, Cellulose, Polymerization.

Submitted at: Oct. 16, 2013
Accepted at: March 13, 2014

Citation

NIHAT PAMUK, Investigation of the long term degradation of cellulosic insulating materials in high voltage power transformer, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 3-4, pp. 422-428 (2014)