Title :
Anomalous creeping flashover characteristics in N2/SF 6 mixtures and effect of barrier surface
Author :
Ueno, H. ; Kamatani, F. ; Egawa, Y. ; Nakayama, H.
Author_Institution :
Dept. of Electr. Eng., Himeji Inst. of Technol., Japan
Abstract :
Creeping flashover characteristics have been investigated for an N 2/SF6 composite insulating system consisting of insertion of an insulating barrier between the needle electrode and the plane electrode. The negative flashover voltage (FOV) for the flat and stepped systems in N2 (D=0%) is as high as that of SF6 (D=0%) by the effective field relaxation from the accumulated charges. Remarkable reduction of FOV induced by few percentages SF6 addition should originate from the barrier interaction such as ineffective charge accumulation and photon-related emission. However, for the grooved system, the confinement effect should be effective, resulting in lower FOV in N2
Keywords :
SF6 insulation; electric strength; electrodes; flashover; insulation testing; nitrogen; N2/SF6 mixtures; accumulated charges; barrier interaction; barrier surface effect; charge accumulation; creeping flashover characteristics; dielectric insulating properties; effective field relaxation; flashover voltage; insulating barrier; miniaturization; needle electrode; photon-related emission; plane electrode; reliability; Conductors; Corona; Dielectric breakdown; Dielectrics and electrical insulation; Electrodes; Flashover; Gas insulation; Needles; Sulfur hexafluoride; Voltage;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973679
