Title :
Investigation of SF6-N2, SF6-CO 2 and SF6-air as substitutes for SF6 insulation
Author :
Qiu, Y. ; Feng, Y.P.
Author_Institution :
High Voltage Div., Xi´´an Jiaotong Univ., China
Abstract :
The dielectric strength of SF6-N2 is slightly higher than that of SF6-CO2 in slightly nonuniform fields encountered in gas-insulated switchgear (GIS) and gas-insulated cables, but the opposite is true in the cases of highly nonuniform fields and gas/film insulation existing in gas-insulated transformers. Experiments also show that the SF6-air mixture with the SF6 concentration being 0.8 can be used in cubicle type GIS, where the impulse dielectric strength of the gas mixture is apparently higher than that of SF6 gas
Keywords :
SF6 insulation; air insulation; carbon compounds; electric breakdown; electric strength; gas insulated switchgear; gas insulated transformers; insulation testing; nitrogen; power cable insulation; power cable testing; power transformer insulation; power transformer testing; switchgear testing; SF6; SF6-CO2; SF6-CO2 insulation; SF6-N2; SF6-N2 insulation; SF6-air insulation; dielectric strength; gas-insulated cables; gas-insulated switchgear; gas-insulated transformers; insulation breakdown testing; nonuniform fields; Coaxial components; Dielectric breakdown; Distributed computing; Electric breakdown; Electrodes; Equations; Rough surfaces; Steady-state; Sulfur hexafluoride; Surface roughness;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549457
