Title :
Charge storage and transport in oil-impregnated pressboard at polarity reversal under HVDC
Author :
Liu, Rongsheng ; Tömkvist, Christer
Author_Institution :
Dept. of High Voltage Technol., ABB Corp. Res., Vasteras, Sweden
Abstract :
Space charge plays an important role in the breakdown and conduction processes of a high voltage direct current (HVDC) insulation system. Electrical breakdown due to charge accumulation in transformer oil and pressboard can cause failures of power transformers, especially at DC polarity reversal. In this paper, we focus our attention on the charge accumulation and movement in an transformer-oil-impregnated pressboard under DC polarity reversal at 60°C. Using a pressure wave propagation (PWP) technique, the distribution of space charge in the sample was measured both at stationary and transient conditions
Keywords :
HVDC power transmission; composite insulating materials; power transformer insulation; space charge; transformer oil; 60 C; DC polarity reversal; HVDC insulation; charge storage; charge transport; conduction; electrical breakdown; failure; power transformer; pressure wave propagation; space charge; transformer-oil-impregnated pressboard; Breakdown voltage; Charge measurement; Current measurement; Electric breakdown; HVDC transmission; Oil insulation; Power transformer insulation; Power transformers; Pressure measurement; Space charge;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1995. Annual Report., Conference on
Conference_Location :
Virginia Beach, VA
Print_ISBN :
0-7803-2931-7
DOI :
10.1109/CEIDP.1995.483569
