Open AccessNumerical investigation of electric field distortion induced by internal defects in composite insulators
Author(s) -
Kone Gbah,
Volat Christophe,
Ezzaidi Hassan
Publication year - 2017
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve.2016.0096
Subject(s) - insulator (electricity) , electric field , materials science , finite element method , distortion (music) , electrode , voltage , electrical conductor , composite material , physics , electrical engineering , structural engineering , engineering , optoelectronics , amplifier , cmos , quantum mechanics
This paper presents an exhaustive study of numerical investigations based on three‐dimensional finite‐element method modelling of several non‐ceramic insulators of 69, 110 and 230 kV having different internal semi‐conductive defects in terms of size and position. The internal defects were positioned close to the high‐voltage electrode, the ground electrode and at floating potential. The simulations effected on the distortion of the axial and radial E ‐field components close to the insulator shank between sheds. The results obtained showed that the radial E ‐field component is more sensitive to the presence of an internal defect as it shows a greater distortion in presence of the defect. It was also observed that the E ‐field component distortion increases with longer internal defect and that this increase is particularly important for a defect at floating potential. Moreover, it was demonstrated that the length of the insulator, for a defect of constant length, has no significant influence on the E ‐field component distortion. Finally, the results demonstrated that the presence of a grading ring, as used on the 230 kV insulator, does not have any influence on the E ‐field component distortion, independently of the defect position.