Improvement of power transformers by using mixtures of mineral oil with synthetic esters

Author

Perrier, C. ; Beroual, A. ; Bessede, J.L.

Author_Institution

Ecole Centrale de Lyon, CEGELY CNRS UMR, Ecully, France

fYear

2005

Firstpage

389

Lastpage

392

Abstract

This paper is aimed at the improvement of power transformers through the improvement of the characteristics of mineral oil by mixing this later with other insulating liquids for transformers namely silicon and synthetic ester oils. A comparison of the main properties such as the heat transfer, breakdown voltage (BDV), ageing stability and electrostatic charging tendency (ECT) of different mixtures as well as liquids alone is presented. It is shown that the optimal mixture enabling to improve the dielectric properties and the ageing stability of mineral oil without degrading its viscosity and ECT is that of mineral oil with 20% of synthetic ester oils.

Keywords

ageing; dielectric liquids; dielectric properties; electric breakdown; electrostatics; heat transfer; power transformer insulation; transformer oil; ageing stability; breakdown voltage; dielectric properties; electrostatic charging tendency; heat transfer; mineral oil; power transformers; silicon oils; synthetic ester oils; transformer insulating liquids; viscosity; Aging; Dielectric liquids; Electrical capacitance tomography; Minerals; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Silicon; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference on

Print_ISBN

0-7803-8954-9

Type

conf

DOI

10.1109/ICDL.2005.1490107

Filename

1490107