DocumentCode :
227494
Title :
The mechanism of electrodes surface inclusions influence on vacuum insulation characteristics
Author :
Tatarinova, N.V.
Author_Institution :
Nat. Res. Nucl. Univ. MEPhI, Moscow, Russia
fYear :
2014
fDate :
June 30 2014-July 4 2014
Firstpage :
1
Lastpage :
2
Abstract :
It is known, that vacuum gap insulation characteristics deteriorate at various types of inclusions on the electrodes surface presence. The greatest influence on the prebreakdown currents and the vacuum gap breakdown voltage are non-metallic inclusions due to the positive charge on them appearance. This charge enhances the surface electric field. There are several hypotheses to explain the vacuum gap conductivity. However, none of them confirmed the existence of such factors as: the presence of several electrons spectrums with energy lower than the Fermi level, changing the emission centres number at temperature exposion, ion irradiation effect and etc. The author suggested to consider the border of inclusions-metal contact as pores type, and to explain the phenomena observed by processes in the pores and supported by these processes Townsend discharge in vacuum gap.
Keywords :
Townsend discharge; electric breakdown; electric fields; electrodes; vacuum insulation; Fermi level; Townsend discharge; electrodes surface inclusions; emission centres number; inclusions-metal contact; ion irradiation effect; nonmetallic inclusions; prebreakdown currents; surface electric field; vacuum gap breakdown voltage; vacuum gap conductivity; vacuum gap insulation; Cathodes; Discharges (electric); Insulation; Ions; Surface discharges; Surface treatment;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vacuum Electron Sources Conference (IVESC), 2014 Tenth International
Conference_Location :
St. Petersburg
Print_ISBN :
978-1-4799-5770-5
Type :
conf
DOI :
10.1109/IVESC.2014.6892086
Filename :
6892086
Link To Document :
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