Title :
Static electrification induced by oil flow in power transformers
Author :
Peyraque, L. ; Beroual, A. ; Buret, F.
Author_Institution :
Jeumont Schneider Transformateurs, Lyon, France
Abstract :
This work concerns the study of the static electrification phenomena on a real power transformer equipped with an exceptional set of oil pumps allowing different tests to be performed with an oil flow reaching nearly five times the rated value. The transformer was filled with two kinds of oils, aged and new, in order to compare their electrostatic charging tendency (ECT). The static electrification levels are analyzed through measurement of the leakage currents under unenergized and energized conditions, and by varying the temperature. Dielectric contraints and temperature are adjusted to values inducing the maximum electrification level. The consequences of static electrification on insulation reliability are analyzed based on the electrification level and acoustically measured partial discharges
Keywords :
ageing; electric breakdown; electric current measurement; insulation testing; leakage currents; partial discharges; power transformer insulation; power transformer testing; static electrification; transformer oil; acoustically measured partial discharges; aged insulation; dielectric contraints; electrostatic charging tendency; insulating oil flow; insulation breakdown tests; insulation reliability; leakage currents measurement; maximum electrification level; power transformers; static electrification phenomena; temperature variation; Acoustic measurements; Aging; Dielectric measurements; Oil insulation; Performance evaluation; Petroleum; Power transformer insulation; Power transformers; Temperature; Testing;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549452
