MODELLING OF THE EFFECTIVENESS INDEX IN ROD-PLANE ELECTRODE CONFIGURATIONS WITH INSULATING BARRIER

Samira Benharat,∗,∗∗ Slimane Bouazabia,∗ and Abderahmane Haddad∗∗∗

Keywords

Insulating barrier, electric field, finite element method (FEM), electric discharge, effectiveness

Abstract

In this article, a new modelling approach and accompanying test results to determine the effectiveness index of a rod-insulating barrier–plane electrode system are presented. The effectiveness index is defined as the ratio of breakdown voltage with and without the barrier inserted within the electrode system. The model predictions were validated through laboratory experimental results. It was verified that the proposed numerical modelling approach of the defined effectiveness index predicts the experimental results with a satisfactory agreement. The influence of different electro-geometrical parameters, such as barrier dimensions (width and thickness), its position and its material (silicone rubber, polytetrafluoroethylene (PTFE), paper) in the air gap interval, were investigated and quantified. Both AC and impulse breakdown voltages for the various electrode configurations were experimentally measured. For the measurement of the breakdown voltage under AC voltage, every configuration case was tested 5 times while a series of 30 tests were adopted for the impulse breakdown measurements. The results have shown that the breakdown voltage of the gap increases with the barrier width. It was also found that the effectiveness index increases with barrier thickness.

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