Title :
Charge accumulation phenomenon in oil immersed pressboard exposed in positively charged transformer oil
Author :
Hamada, Hiroshi ; Minowa, Kazunori ; Yamagata, Yoshibumi ; Tanabe, Koji ; Hasegawa, Taketoshi ; Fujii, Haruhisa ; Hosokawa, Noboru
Author_Institution :
Tokyo Electr. Power Co. Inc., Japan
Abstract :
It was dicovered that the pressboard immersed in positively charged oil were highly charged up. The experiments to evaluate the charge density and the charge distribution in the pressboard were carried out to investigate the mechanism of charge accumulation. In the experiment, positive charges generated by oil flow were supplied to the pressboard sample. Charge densities in oil and pressboard were evaluated from the potential measurement. Charge distribution in pressboard was estimated from the current-time characteristics at DC voltage application to the pressboard
Keywords :
impregnated insulation; paper; power transformer insulation; space charge; static electrification; transformer oil; DC voltage application; charge accumulation phenomenon; charge density; charge distribution; current-time characteristics; large power transformers; oil immersed pressboard; positive space-charge; positively charged transformer oil; potential measurement; static electrification; streaming electrification; transient current measurement; Charge measurement; Current measurement; Density measurement; Electrodes; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Probes; Testing;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2001 Annual Report. Conference on
Conference_Location :
Kitchener, Ont.
Print_ISBN :
0-7803-7053-8
DOI :
10.1109/CEIDP.2001.963584
