Title :
High voltage breakdown and pre-breakdown properties in rape-seed insulating oil
Author :
Duy, C. Tran ; Lesaint, O. ; Bonifaci, N. ; Denat, A. ; Bertrand, Y.
Author_Institution :
Grenoble Univ. & CNRS, Grenoble
Abstract :
Rape-seed oil is considered for electrical insulation at high voltage. In this work, breakdown and streamer propagation in rape seed oil are studied in point-plane gaps up to 20cm, under impulse voltage of both polarities. In both polarities, two main streamer types are observed: "slow" streamers with a velocity of about 2km/s, and much faster streamers up to 150km/s. Compared to mineral oil in the same conditions, fast streamers in rape-seed oil appear at much lower voltage. They are able to propagate over large distances within a short time at moderate voltage. From these results, it is concluded that the properties of streamers in rape-seed oil are less favorable for high voltage insulation than in mineral oil.
Keywords :
discharges (electric); transformer oil; vegetable oils; electrical insulation; high voltage breakdown; impulse voltage; point-plane gaps; prebreakdown properties; rape-seed insulating oil; streamer propagation; transformer oils; Breakdown voltage; Dielectric breakdown; Dielectrics and electrical insulation; Electric breakdown; Liquids; Minerals; Oil insulation; Petroleum; Power transformer insulation; Testing;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2007. CEIDP 2007. Annual Report - Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-1482-6
Electronic_ISBN :
978-1-4244-1482-6
DOI :
10.1109/CEIDP.2007.4451466
