access icon openaccess Numerical investigation of electric field distortion induced by internal defects in composite insulators

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 12/12/2016, Accepted 29/05/2017, Revised 20/03/2017, Published 07/06/2017

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.

Inspec keywords: finite element analysis; electrodes; electric fields; distortion; composite insulators

Other keywords: numerical investigation; voltage 230 kV; high-voltage electrode; radial E-field component; voltage 110 kV; voltage 69 kV; three-dimensional finite-element method modelling; internal defects; nonceramic insulators; composite insulators; field distortion; ground electrode; E-field component distortion

Subjects: Power line supports, insulators and connectors; Finite element analysis

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