ABSTRACT
In a high-voltage equipment, as a thumb rule, the cost of insulation increases with the cube of voltage rating. However, practical experience shows that insulation failure is the most frequent cause of major breakdown of electrical equipment. High-voltage equipment, in practice, is, in most of the cases, subjected to AC field of frequency 50 or 60 Hz. Numerical methods are commonly based on the solutions of partial differential equations or integral equations with some analytic simplification for easy implementation. Region of interest (ROI) is the region where the solution for electric field is to be obtained. One should find the field solution at each and every point within the ROI. But it will result in immense computational burden and hence the field solution is obtained at discrete nodes. The results at any desired location is computed using the assumed variation of electric field between the nodes, which is termed as post-processing of results.
