Influence of insulation paper degradation on economical operation period of power transformers

Electric utilities have tried to improve their quality of services. At the same time, total expenses should be reduced as much as possible. In this paper, a method to analyze economical operation period of transformers is proposed to solve the problems. There are two approaches performed in this paper, analysis using transformer failure statistics and analysis using transformer operational data. Analysis using transformer failure statistics and population data is carried out as general economical operation period characteristic of the transformers that operate at PLN Java Bali Transmission and Load Dispatch Center. Another analysis using transformer operational data is carried out to give specific economical operation period characteristic of transformer. Four operating conditions with different load and water content are studied to determine economical operation period of transformers for each condition.