Title :
A new multi-ridge model for electrode surface roughness effect in SF6
Author :
Li, R. ; Qiu, Y.
Author_Institution :
Zhejiang Electr. Power Test & Res. Inst., Hangzhou, China
Abstract :
A multiridge model that is based on the surface roughness measurements of machined electrodes is presented. Containing three independent parameters which specify the essential geometry of a ridged surface, the model can quantitatively predict the effect of surface roughness formed by machining on the discharge of SF6 gas by means of the charge simulation method and the streamer breakdown criterion. Two turned electrodes and one electrode with a fine copper wire wound on it to form multiple semicylinder ridges were tested, and the model predictions were calculated. The results indicate that within the engineering pressure range the validity of model predictions is well ensured provided that the streamer criterion is decisively effective in the actual breakdown process
Keywords :
electric breakdown of gases; gaseous insulation; sulphur compounds; Cu wire; SF6 gas; breakdown process; charge simulation method; electrode surface roughness effect; engineering pressure range; geometry; machined electrodes; multi-ridge model; multiple semicylinder ridges; multiridge model; ridged surface; streamer breakdown criterion; streamer criterion; turned electrodes; Copper; Electric breakdown; Electrodes; Geometry; Machining; Predictive models; Rough surfaces; Solid modeling; Surface discharges; Surface roughness;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38344
