satisfactory accuracy, and therefore digital computation is necessary. The method is now illus-A numerical method for the computation of trated with suitable examples chosen for the comelectrostatic fields is described. The basis of putation of electrostatic fields with one or more the method is the use of fictitious line charges dielectrics. as particular solutions of Laplace's and Poisson's equations. Details are given of a digital computer BASIC PRINCIPLE program developed for field calculations by means of this method, and its application is illustrated For the calculation of electrostatic fields, by practical examples involving twoand threethe distributed charge on the surface of conducdimensional geometries. tors is replaced by n line charges arranged inside the conductors. In order to determine the magni-T 74 085-7, recommended and approved by the IEEE Transmission & Distribution Committee of the IEEE Power Engineering Society for presentation at Tedsrtsto fsraecagsb n

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Capacitive-resistive field distributions including surface and volume resistivities have been computed in and around HV porcelain and capacitor bushings. The boundary element method has been applied for field computation in two axi-symmetric bushing configurations including four dielectrics. Effects of uniform and non-uniform distributions of surface resistivity and volume resistivities of different dielectric media are studied in detail. Special emphasis has been given to the stress distributions along the various dielectric-dielectric boundaries. Further, the values and locations of maximum stresses in different dielectrics are determined and reported in this paper. The plots of equipotential lines for a few typical cases of field distributions are also presented here for both bushings.

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