Electric Field Optimization of the Power Cable Joint by Using Evolutionary Calculation Method

Abstract

This paper examines electric field optimizations at the joint of power cables by using evolution strategy((1+1)-ES, (μ+λ)-ES) and genetic algorithm which are so called evolutionary calculation method. The object of the paper is to minimize the electric field strength on the inner curved electrode under the constraint that the electric field strength along the interface between the two different insulators should be below the permissible value. The surface charge method that provides accurate solutions on the boundaries for the multi-layer substances with relatively small number of elements is employed for the calculation of the electric field distribution. Three evolutionary calculation methods are employed for the optimization method. Because these methods employ mutation and rearrangement(cross-over) processes, the shape design can be performed widely and locally. As a result, each method can reduce the electric field strength on the inner curved electrode while the electric field strength along the interface was kept below the permissible value. The search results of each optimization method were compared and found that the (μ+λ)-ES shows the best performance among the three methods.