Title :
Static electrification of the insulating materials used in power transformers
Author :
Peyraque, L. ; Beroual, A. ; Buret, F.
Author_Institution :
Ecole Centrale de Lyon, Ecully, France
Abstract :
It is shown that the electrostatic charge tendency (ECT) is a valuable indication allowing one to evaluate the levels of the charge density which can be reached by the oil in a power transformer. A correlation can be made between this parameter (ECT) and the physicochemical and electrical characteristics of the oil. It is shown that the water migration phenomena at the oil/pressboard interface play an important role in the charge separation. Hence we investigate the influence of the rugosity of the pressboard, the temperature gradients and the ageing of the oil. The effect of the antistatic additives on the ageing and the ECT is also considered
Keywords :
ageing; power transformer insulation; power transformers; static electrification; transformer oil; antistatic additives; charge density; charge separation; electrostatic charge tendency; insulating materials; oil ageing; oil/pressboard interface; power transformers; pressboard rugosity; static electrification; temperature gradients; water migration phenomena; Aging; Dielectric measurements; Electrical capacitance tomography; Electrostatic measurements; Filters; Lubricating oils; Oil insulation; Petroleum; Power transformer insulation; Power transformers;
Conference_Titel :
Conduction and Breakdown in Dielectric Liquids, 1996, ICDL '96., 12th International Conference on
Conference_Location :
Roma
Print_ISBN :
0-7803-3560-0
DOI :
10.1109/ICDL.1996.565569
