Abstract

The use of vegetable oil (natural ester) in electrical devices like power transformers is increasing due to their high biodegradability and better safety. The lifespan of power trans- formers is mainly defined by cellulose insulation condition, which usually works together with dielectric oil as electrical insulation and also as mechanical winding protector and compactor. That is why the aim and results of this research shows us not only the dielectric parameters evolution, but also the relationship between the mechanical factors and the moisture content of thermal accelerated ageing processes, with commercial vegetable oil, of Kraft paper and Diamond Dotted Paper (DDP). These are two of the most common insulating materials in electric power transformers. In addition, the new tests have been done by a different method of paper ageing analysis.

Highlights

  • Electric power transformers have always been essential devices for the proper functionality of electrical distribution networks throughout the world

  • Sample preparation Strips and circular Kraft and Dotted Paper (DDP) paper samples were cut into specific dimensions. 200x15mm strips were prepared for mechanical experiments with different fiber direction angles because of cellulose anisotropy

  • Dielectric results On the one hand, circular samples of Kraft and DDP were taken to evaluate the progress of ageing with vegetable oil by dielectric analysis

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Summary

Introduction

Electric power transformers have always been essential devices for the proper functionality of electrical distribution networks throughout the world. These machines are made from different materials and typologies. That is why paper deterioration is a key element, so the oil’s life can be prolonged by different methods or it can be replaced during maintenance . These machines normally use mineral or synthetic oil or even mixtures, as insulator and cooling fluids [2], but alternative formulations are growing in popularity. Some authors have analysed the ageing behaviour of some types of

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