DocumentCode
1480377
Title
The relationship among AC surface spark-over voltage, specific capacitance of solid insulator and bubbles in LN2 and LHe
Author
NItta, Tanzo ; Chiba, Masakuni ; Uematsu, Hisashi
Author_Institution
Dept. of Electr. Eng., Tokyo Univ., Japan
Volume
11
Issue
1
fYear
2001
fDate
3/1/2001 12:00:00 AM
Firstpage
1773
Lastpage
1776
Abstract
The characteristics of AC surface electrical discharge on solid insulators in liquid nitrogen (LN2) or liquid helium (LHe) are studied. The insulation structure used is a model of a power cable end. Bubbles are generated due to discharge at a lower voltage than that of spark-over. However, it was experimentally and computationally confirmed that the bubbles do not influence the spark-over voltage. In the structure, static capacitance is formed on the insulator surface. The surface spark-over voltage depends on the static capacitance. The relation between surface spark-over voltage and the static capacitance is experimentally considered for several insulators. The results show that the spark-over voltage is lower for larger static capacitance. The relation between the spark-over voltage and the capacitance can be expressed by an equation V=A·Csp-B
Keywords
bubbles; capacitance; insulator testing; liquid helium; sparks; superconducting cables; surface discharges; AC surface spark-over voltage; He; N2; bubbles; insulation structure; liquid He; liquid N2; power cable end model; solid insulator; specific capacitance; static capacitance; superconducting cables; surface electrical discharge; Cable insulation; Capacitance; Dielectric liquids; Dielectrics and electrical insulation; Helium; Nitrogen; Power cables; Solids; Surface discharges; Voltage;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/77.920128
Filename
920128
Link To Document