Title :
Flashover along cylindrical insulating surfaces under positive lightning impulse voltages
Author :
Lazaridis, L.A. ; Mikropoulos, P.N. ; Darras, A. ; Theocharis, A.
Author_Institution :
Sch. of Electr. & Comput. Eng., Aristotle Univ. of Thessaloniki, Thessaloniki, Greece
Abstract :
Results are presented concerning discharge development and breakdown along cylindrical insulating surfaces in a 12 cm long rod-plane gap under positive standard lightning impulse voltages. Cylindrical insulator specimens, made of silicone rubber and glazed porcelain, could be inserted parallel to the rod electrode, bridging the gap; the case of air alone was regarded as reference. Discharge development patterns were obtained by oscillographic monitoring of the electric field strength at the earthed plane. An insulating surface, depending on material permittivity, may inhibit the development of the initial corona streamers but favour breakdown.
Keywords :
corona; electric breakdown; electric field measurement; flashover; impulse testing; insulator testing; lightning; porcelain insulators; silicone rubber insulators; cylindrical insulator testing; discharge development patterns; earthed plane; electric field strength; flashover; glazed porcelain; initial corona streamers; insulator breakdown; material permittivity; oscillographic monitoring; positive lightning impulse voltage; silicone rubber; Breakdown voltage; Electrodes; Flashover; Insulation; Lightning; Monitoring; Porcelain; Rubber; Standards development; Surface discharges;
Conference_Titel :
Gas Discharges and Their Applications, 2008. GD 2008. 17th International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-0-9558052-0-2
