Title :
The effect of temperature on the impulse voltage strength of SF6 in inhomogeneous electrode gaps
Author :
Nousiainen, K. ; Lakervi, E.
Author_Institution :
Power Eng. Group, Tampere Univ. of Technol., Finland
Abstract :
The effect of gas temperature on the impulse voltage strength of a rod-plane electrode gap in SF6 was studied with positive standard lightning impulses. Two hemispherically capped rods, the radii of which were 2 mm and 5 mm, were used. The electrode distance was either 20 mm or 30 mm. The temperature was varied from -30°C up to +60°C, and the gas pressure was 1.5 bar or 2.0 bar. The breakdown strength was observed to decrease with increasing gas temperature, although the differences were small. The effect was strongest with the electrode gap having the most nonuniform electric field and with the lower pressure
Keywords :
electric breakdown of gases; electric strength; gaseous insulation; impulse testing; spark gaps; sulphur compounds; transients; -30 to 60 C; 1.5 to 2.0 bar; 10 mm; 20 mm; 30 mm; 4 mm; SF6; breakdown strength; effect of temperature; electrode distance; gas pressure; gas temperature; hemispherically capped rods; impulse voltage strength; inhomogeneous electrode gaps; nonuniform electric field; positive standard lightning impulses; rod-plane electrode gap; Breakdown voltage; Dielectric breakdown; Electric breakdown; Electrodes; Lakes; Lightning; Nonuniform electric fields; Power engineering; Sulfur hexafluoride; Temperature distribution;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109745
