A New Contribution in Reducing Electric Field Distribution Within/Around Medium Voltage Underground Cable Terminations

Abstract

Ιn medium voltage cables, the stress control layers play an important part in controlling the electric field distribution around the medium voltage underground cable terminations. Underground cable accessories, used in medium voltage cable systems, need a stress control tube in order to maintain and control the insulation level which is designed for long life times. The term “electrical stress control” refers to the cable termination analysis of optimizing the electrical stress in the area of insulation shield cutback to reduce the electrical field concentration at this point in order to reduce breakdown in the cable insulation. This paper presents the effect of some materials of different relative permittivities and geometrical regulation with the curved shape stress relief cones on the electric field distribution of cable termination. The optimization was done by comparing the results of eight materials used. Also, the effect of the change in the thickness of the stress control tube is presented. The modeling design is very important for engineers to find the optimal solution of terminator design of medium voltage cables. This paper also describes the evolution of stress control systems and their benefits. A developed program using Finite Element Method (FEM) has calculated a numerical study to the stress control layering electric field distribution.

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“…The typical resonant responses between the first and second resonators, or between the fourth and fifth resonators, are shown in Figure 3(b). The coupling coefficient can be then extracted by using the following relation [8]:…”

“…The current work proposes and investigates a unique fivepole micro-strip band-pass filter with a two-layer structure and aperture-coupled hairpin resonators operating at 2.45GHz [9]. The suggested filter architecture consists of five hairpin resonators etched on two stacked layer substrates, with two slots in the common ground plane providing coupling between the upper and bottom layer resonators [8][9][10].…”

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