NDLI: Surface treeing on pressboard barriers in synthetic and natural ester liquids under AC stress

Content Provider	IEEE Xplore Digital Library
Author	Yi, X. Wang, Z.D. Perrot, F. Lashbrook, M.
Copyright Year	2011
Description	Author affiliation: ALSTOM Grid Research & Technology, Stafford, UK (Perrot, F.) \|\| The University of Manchester, UK (Yi, X.; Wang, Z.D.) \|\| M&I Materials Ltd, Manchester, UK (Lashbrook, M.)
Abstract	This paper reports experimental investigations on pressboard surface treeing processes and the accompanying creepage discharge patterns. With the help of fast digital video recorder, wideband discharge current sampling resistor and commercial PD detector, it is found that the liquid impregnated pressboard as composite insulation is susceptible to erosion giving rise to white marks due to intense discharges occurring on/near to the pressboard surface. The white mark is visible after discharges evaporate the liquid and moisture and takes the form of trapped gaseous bubbles within the surface layers of pressboard. Once the white mark is formed, it can continue to grow even under a reduced voltage level until it bridges the gap and finally causes flashover. The white mark appears at a lower voltage and propagates more readily on the ester impregnated pressboard, due to more intense discharges, more gas generation and the higher viscosity of esters than mineral oil.
Starting Page	1
Ending Page	4
File Size	1805069
Page Count	4
File Format	PDF
ISBN	9781424473526
ISSN	21533725
e-ISBN	9781424473557
e-ISBN	9781424473540
DOI	10.1109/ICDL.2011.6015452
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-26
Publisher Place	Norway
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discharges Needles Surface discharges Partial discharges Minerals Flashover Dielectric liquids mineral oil Creepage discharge surface treeing synthetic ester natural ester
Content Type	Text
Resource Type	Article

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