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- Title
Dynamic model to predict AC critical flashover voltage of nonuniformly polluted insulators under thermal ionization conditions.
- Authors
SHAHABI, Saeed; GHOLAMI, Ahmad
- Abstract
This paper presents a theoretical dynamic model based on the Hampton criterion and Mayr's equation for predicting the critical values of ashover on the surface of nonuniformly polluted cap and pin porcelain insulators. The nonuniform pollution layer on the surface of the insulator, the number of disk insulator units, and the geometry of the insulator such as diameter and ribs are the important factors used for prediction. Two types of pollution layer configuration, linear and graded, are introduced as nonuniform pollution layers. The inuences of the nonuniform pollution layer on critical ashover voltage are investigated. Furthermore, a random value is added to the surface discharge length during propagation in order to consider the effects of the wind and thermal convection on surface discharge length. The specifications of a real porcelain disk insulator are used in the model. Finally, the estimated results of the proposed model are compared with the measured data of the tests in order to validate the proposed model.
- Subjects
PORCELAIN insulators; FLASHOVER; ELECTRIC discharges; STRAY currents; SURFACE discharges (Electricity)
- Publication
Turkish Journal of Electrical Engineering & Computer Sciences, 2017, Vol 25, Issue 3, p2322
- ISSN
1300-0632
- Publication type
Article
- DOI
10.3906/elk-1603-279