Modeling Metal Oxide Surge Arrester for the Modern Polarization Based Diagnostics

Recently a number of new non-destructive diagnostic techniques have been investi-gated for the reliable condition assessment of the ageing of metal oxide surge ar-()rester MOSA. Among them polarizationrdepolarization current and return volt-age measurement techniques showed very promising results. This paper presents an insulation polarization model for investigating polarization-based diagnostics for metal oxide surge arrester. The simulations of the proposed model are vali-dated and verified by comparing the data from the polarizationrdepolarization current measurements. The simulation of return voltage for MOSA is also per-formed to validate the insulation polarization model. Finally, the usefulness of this model for MOSA diagnostics has been highlighted in this paper. Index Terms — Metal oxide surge arrester, ageing and diagnostics, polariza-tionrdepolarization current, return voltage.