An Overview of Electrical and Thermal Analysis of Insulation Properties of Different Transformer Oils [articol]

Abstract

Trends in the field of high voltage engineering show most of the conducted works have focused on the transformer oil such as mineral oil, vegetable oil, oil-based Nano fluids. The average life period of transformer has reduced to half of their designed life due to insulation problem and its 75% of high voltage transformers are caused by insulation failures. Both the life time and functional reliability of transformers mainly depends on the insulating materials. This paper presents an overview and general backgrounds of research and development in the field of different solution methods to obtain the physical and chemical properties of different transformer oil like mineral oil, vegetable oil, oil-based nano fluids found in the literature. Some of the most popular methods that included various testing, analysis method and simulation methods are reviewed and analysed in detail. This paper provides useful guidelines for the future studies for those interested in the problem or intending to do additional research in this area.