DocumentCode :
2558227
Title :
Spark to glow discharge transition in cavities
Author :
Bartnikas, R. ; Novak, J.P. ; McNicoll, Y.
Author_Institution :
IREQ, Varennes, Que., Canada
fYear :
1990
fDate :
3-6 Jun 1990
Firstpage :
352
Lastpage :
355
Abstract :
The occurrence of spark, pseudoglow, and glow discharge in short gaps is discussed. The effect of gap spacing and overvoltage is examined in terms of both experimental observations and theoretical calculations. It is found that gaps or cavity diameters are more likely to undergo spark-type discharge, since the larger gas volume is more conductive to an uninterrupted exponential growth of the electron and ion concentration required for spark channel formation. In small gaps, the proximity of the electrode boundaries impedes the exponential growth of free electrons, permitting a smaller charge density and thus resulting in diffused glow-type discharge. A larger applied voltage will provide a greater energy input to the gap. This will result in a more rapid growth of the electron concentration, favoring the formation of spark discharges. It is noted that the high probability that all three forms of discharge tend to occur simultaneously should permit the continuous use of pulse detection methods on rotating machines
Keywords :
electric breakdown of gases; glow discharges; overvoltage; sparks; applied voltage; cavities; diffused glow-type discharge; electron concentration; gap spacing; ion concentration; overvoltage; pseudoglow discharge; pulse detection methods; rotating machines; short gaps; spark-type discharge; Capacitance; Dielectrics; Electrodes; Gases; Glow discharges; Helium; Partial discharges; Sparks; Surface discharges; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
ISSN :
1089-084X
Type :
conf
DOI :
10.1109/ELINSL.1990.109771
Filename :
109771
Link To Document :
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