Title :
Electric discharge along post insulating constructions under rain conditions
Author :
Koriavin, A.R. ; Volkova, O.V. ; Golovnya, V.G.
Author_Institution :
All-Union Electrotech. Inst., Moscow, USSR
Abstract :
The authors present results of an investigation of breakdown characteristics and discharge formation pictures along post insulating constructions under rain conditions with positive polarity switching impulses. Based on the discharge process data obtained, the causes of substantial decrease in post insulation electric strength in the rain were analyzed. The most probable cause of considerably decreased post insulation electric strength under rain conditions (approximately by 40%) is substantially redistributed electric field due to a nonuniform active conductivity distribution along the insulator surface. The discharge formation in the rain is due to the leader mechanism and characterized by a great variety of discharge process forms and features. In order to reduce the risk of post insulation electric strength decrease in the rain, it is necessary to use an insulator having a high structural height along the entire construction
Keywords :
discharges (electric); electric breakdown of solids; electric strength; insulators; rain; breakdown characteristics; discharge formation pictures; discharge process forms; electric strength; insulator; leader mechanism; nonuniform active conductivity distribution; positive polarity switching impulses; post insulating constructions; rain conditions; structural height; Breakdown voltage; Conductivity; Data analysis; Dielectrics and electrical insulation; Electric breakdown; Impulse testing; Insulator testing; Plastic insulation; Polymers; Rain;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172069
