Abstract
Numerical analysis of electric field is performed by several practical methods. The surface charge simulation method is used for three-dimensional analysis of static electric field in the medium with constant and homogeneous permittivity. The number of unknowns becomes large in practical problems, and large memory storage and long computation time are required. Therefore, when a computation model where the electric field distribution is known is given and a small conductor is added to the computation model, we propose an efficient method superposing the known electric field distribution. In the proposed method, the surface charges induced by the added small conductor are used as unknowns. By using the proposed method, the area to be analyzed becomes small and the number of unknowns is reduced. The formula for the proposed method and how the area to be analyzed is determined are shown. Furthermore, some numerical examples and an application for the power cable with defect are presented.
