Title :
Investigation on emitted energy during breakdown in transformer oil AC voltage
Author :
Abdi, S. ; Boubakeur, A. ; Harid, N. ; Haddad, A.
Author_Institution :
Univ. of Medea, Medea, Algeria
fDate :
Aug. 31 2010-Sept. 3 2010
Abstract :
The risk of breakdown in mineral insulating oil constitutes a critical part in the insulation of high voltage apparatus such as transformer. This paper presents an experimental investigation on transformer oil dynamic breakdown characteristics when subjected to AC voltage. Breakdown tests were carried out on mineral oil samples using a sphere-sphere electrode test cell for various gap lengths 1 mm, 2.5 mm and 5 mm and at different voltage speed ramps: 0.5kV/s, 2kV/s and 3.5kV/s. The emitted energy of the mineral oil samples was determined from the instantaneous product of voltage and current. Such emitted energy can be used to explore the properties of the arc and its development within the oil. The results of this investigation show that the gap length and the voltage speed ramp have a significant influence on the emitted energy of the oil during breakdown.
Keywords :
electric breakdown; electrodes; power transformer insulation; transformer oil; breakdown tests; high voltage apparatus; mineral insulating oil; size 1 mm; size 2.5 mm; size 5 mm; sphere-sphere electrode test cell; transformer oil AC voltage; transformer oil dynamic breakdown characteristics; voltage speed ramp; Breakdown voltage; Electric breakdown; Electrodes; Oil insulation; Petroleum; Power transformers; Voltage measurement; AC voltage; breakdown current; breakdown voltage; emitted energy; gap length; transformer oil; voltage ramp-speed;
Conference_Titel :
Universities Power Engineering Conference (UPEC), 2010 45th International
Conference_Location :
Cardiff, Wales
Print_ISBN :
978-1-4244-7667-1
