Abstract
This paper proposes an electric field optimization at the joint of power cables using the evolution strategy(ES). The object is to minimize the electric field strength on the inner curved surface of the electrode under the constraint that the electric field strength along the interface between the two different insulators should be below a permissible value. The second order of Riesenfeld spline function is applied for smoothing the inner curved electrode surface. The surface charge method that provides accurate solutions on the boundaries for the multi-layer substances with less number of elements is employed for the calculation of the electric field distributions. ES can easily omit the cases that are out of the constraint condition. Moreover, ES can easily change the search width in the consequence of searching the shape. The searching process of ES was compared with that of the genetic algorithm(GA). As a result, ES reduces the electric field strength on the inner curved electrode compared to GA. In the best case, the electric field strength was reduced to 49.7% that of an initial model.
