Title :
Accumulative effect on streamer propagation of lightning impulses on oil/pressboard interface
Author :
Liu, Q. ; Wang, Z.D. ; Dyer, P. ; Walker, D.
Author_Institution :
Univ. of Manchester, Manchester, UK
Abstract :
This paper reports the accumulative effect of multiple negative lightning impulse shots on streamer propagation along liquid/pressboard surface. Pressboards impregnated with the insulating liquids including a mineral oil, a natural ester and a synthetic ester were tested under a point-plane divergent field. Streamer propagation was recorded by a high speed intensified CCD camera. In addition, current and light signals were monitored by non-inductive current shunt and photo multiplier tube (PMT) respectively. It was found that with 60 s time interval between consecutive shots a streamer along mineral oil/pressboard interface advances itself following each shot and could eventually lead to flashover in a multiple-shot test, while streamers on ester/pressboard interface seem uninfluenced by the accumulative stresses.
Keywords :
CCD image sensors; discharges (electric); flashover; lightning; photomultipliers; power transformer insulation; transformer oil; PMT; accumulative stress effect; ester-pressboard interface; flashover; high speed intensified CCD camera; insulating liquid; light signal monitoring; liquid-pressboard surface; mineral oil; mineral oil-pressboard interface; multiple negative lightning impulse shot; multiple-shot test; natural ester oil; noninductive current shunt; photomultiplier tube; point-plane divergent field; streamer propagation; synthetic ester oil; Dielectric liquids; Electric breakdown; Insulation; Lightning; Minerals; Power transformer insulation; Streaming media; accumulative effect; ester; lightning impulse; mineral oil; pressboard; streamer propagation; transformer insulation;
Conference_Titel :
Dielectric Liquids (ICDL), 2011 IEEE International Conference on
Conference_Location :
Trondheim
Print_ISBN :
978-1-4244-7352-6
Electronic_ISBN :
2153-3725
DOI :
10.1109/ICDL.2011.6015432