Title :
Decay characteristics of residual dc voltage for 1000 kV GIS
Author :
Yamagata, Y. ; Rokunohe, T. ; Endou, F.
Author_Institution :
Tokyo Electr. Power Co., Chiyoda-Ku, Japan
Abstract :
Volume and surface resistivity are varied by temperature and electric field strength of an insulator. As change of the insulator electric field strength is very small during residual dc voltage measurement, insulator resistivity depends on temperature. So insulator resistivity is estimated by fundamental characteristics of resistivity as a function of temperature. Then the decay time constant of residual dc voltage for l000 kV GIS is calculated by resistivity based on the calculated insulator resistance for the temperature. Finally the measured decay time constant is compared with the calculated one.
Keywords :
electric strength; electrical resistivity; gas insulated substations; gas insulated switchgear; 1000 kV; GIS; decay time constant; insulator electric field strength; insulator resistivity; surface resistivity; Computational Intelligence Society; Conductivity; Dielectrics and electrical insulation; Electrodes; Geographic Information Systems; Prototypes; Surges; Temperature; Testing; Voltage measurement;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218492
