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

fYear

2010

fDate

Aug. 31 2010-Sept. 3 2010

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Universities Power Engineering Conference (UPEC), 2010 45th International

Conference_Location

Cardiff, Wales

Print_ISBN

978-1-4244-7667-1

Type

conf

Filename

5649397