Title :
Anomalous creeping flashover characteristics in N2/SF 6 mixed gas under single pulse voltage
Author :
Ueno, H. ; Sakamoto, N. ; Nakayama, H.
Author_Institution :
Dept. of Electr. Eng., Himeji Inst. of Technol., Hyogo, Japan
fDate :
4/1/2001 12:00:00 AM
Abstract :
Creeping flashover characteristics for the needle electrode-plane electrode filled with N2/SF6 gas mixtures have been investigated. In the case of the needle-plane configuration, the flashover voltage was enhanced by an admixture of SF6 into N 2. On the other hand, by the insertion of a solid dielectric barrier between the needle and the plane, only the negative creeping flashover voltage was reduced drastically by the admixture of SF6 gas into N2 gas, and a highly emissive region at the top of a creeping corona was found in N2/SF6 gas mixture. This behavior is strongly affected by the creeping corona extension process, depending on the creeping distance and the gas pressure
Keywords :
SF6 insulation; corona; electrodes; flashover; gas insulated switchgear; N2-SF6; SF6; anomalous creeping flashover characteristics; creeping corona; creeping distance; flashover voltage; gas pressure; highly emissive region; mixed gas; needle electrode-plane electrode; single pulse voltage; solid dielectric barrier; Corona; Dielectric breakdown; Dielectrics and electrical insulation; Flashover; Gas insulation; Needles; Power system reliability; Solids; Sulfur hexafluoride; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
