Title :
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
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;
Conference_Titel :
Dielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8954-9
DOI :
10.1109/ICDL.2005.1490107
