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.
Highlights
Distribution of power is generally implemented using overhead lines or underground cables [1]
The stress control tube applied on the cable screen reduces electric field at the termination area successfully
The effect of the electric field distribution is best achieved by a material with Ɛr =40
Summary
Distribution of power is generally implemented using overhead lines or underground cables [1]. The development of medium voltage underground cable accessories requires basic understanding of the stress caused by the electric field in different parts of the insulating structures. Medium power cables need electrical stress control when terminated. The design of underground cable terminations must eliminate the electric field concentration to reduce the breakdown of the cable. Underground cable accessories used in medium voltage cable systems need a highly reliable stress control system in order to maintain and control the insulation level which is designed for estimated life times longer than 30 years [4]. At the shield cut-back of a termination, an increase of the electric field strength happened, which makes discharges in the first time and later on to breakdown or flashover. Near the screen there is a critical area where an increase of the electric field happens [7]
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