bem_GIS - F E A T U R E A R T I C L E Application of the 3D...

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FEATURE ARTICLE Application of the 3D Boundary Element Method in the Design of EHV GIs Components Key Words: Numerical field calculation, computation, 3D modeling by N. dE KOCKAND M. MENDIK, ABB High Voltage Technologies, Ltd., Z. ANDJELIC AND A. BLASZCZYK, Al3B Corporate Research This new tool changes our design process in that no more repeated HV tests and multiple prototypes aye necessary. INTRODUCTION he main purpose of numerical field calculation in high voltage engineering is the optimization of the electrode T shape of dielectrically stressed components. In the de- sign of gas-insulated switchgear (GIS) components, several conflicting requirements must be satisfied simultaneously in order to ensure success. For example, a design must be com- pact in order to reduce material costs and to allow for modu- lar, cost-effective layouts. At the same time, the electric field stresses on the active components must be low enough to en- sure reliability and compliance with international standards (IEC, ANSI, etc.) for the voltage. This challenge, although not new to GIS design, has intensified in recent years as com- petition in the market has driven down prices and placed cost pressure on manufacturers. To meet technical and economic objectives, designers in the 1990s have been required to make use of geometries that cannot be approximated adequately using analytical or sim- ple numerical field calculation methods based on axial (cy- lindrical) symmetry. In addition, the cost of building multiple prototypes for trial and error design has become prohibitive. A very important goal of numerical simulation is, therefore, reducing the number of development tests. For this reason, three- dimensional (3D) field calculation has be- come an important design tool for EHV GIs. A variety of computational methods can be applied to 3D field computation. The Boundary Element Method (BEM) offers several advantages over other methods in terms of accuracy and efficiency. In addition to contrasting BEM to other methods, this article will explain the basic theory of BEM. A characteristic feature of BEM is the relatively long cal- culation time associatecl with the numerical integration. Even with powerful engineering workstations, we were not quite able to calculate the largest models within a reasonable time. Through the application of Parallel Virtual Machine (PVM) software, which enables distributed parallel process- ing, computation times can be reduced significantly through the use of distributed colmputing capacity available over the network. This article will relate some of our experiences in the application of parallel field computations based on BEM. Slave 1 v / Master <- . S Ive 2 ' Sacs3 A 1 o=v Fig. 1 Parallelization concept: Each computer calculates a part of the matrixand stores it locally. The size of the matrix pelrt corresponds to the computer speed and the cur- rent load.
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bem_GIS - F E A T U R E A R T I C L E Application of the 3D...

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