Stress Cone Effect Analysis and Optimum Design of Extra High-Voltage Cable Joint Using Neural Networks

Abstract

The major problem in high-voltage cable accessories is the electric field stress caused by the high-voltage level at the cable junction. In this paper, a neural network and simulation-based optimal design for extra high-voltage (EHV) cable accessory is proposed to ensure the optimum electrical design. The different kinds of geometries of the EHV underground cable accessory are realized in the Comsol Multiphysics software program, and the electric field analyses are conducted based on the finite element method. The design of high-voltage underground cable accessories is examined both within and without the optimal stress cone geometry. A neural network-based model is developed according to the analysis results obtained in the simulation. Thanks to this model, the geometry of the stress cone is determined. In the simulation-based analysis, the electric field stress caused by the high-voltage level at critical points is controlled with an optimum joint design using neural networks. The proposed model will contribute to EHV cable joint design at different stress levels.

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“…5 Thus, there is a huge demand for cable joints in long-distance cable systems. 6,7 Investigations into cable operation failure have revealed that the breakdown often occurs at the interface of cable accessories due to its complex multilayer insulation coordination issues (as shown in Figure 1b,c), which makes the cable accessory become the weakest link in the entire power cable system. [8][9][10] Hence, it is imperative to investigate the mechanism of the interfacial failure of the cable accessories, which is of great significance for reducing the number of cable system failures and ensuring the stability of the power system.…”

“…Cable accessories, namely joints and terminals, as shown in Figure 1a, are indispensable components for power cable system to connect the different cable bodies 5 . Thus, there is a huge demand for cable joints in long‐distance cable systems 6,7 . Investigations into cable operation failure have revealed that the breakdown often occurs at the interface of cable accessories due to its complex multilayer insulation coordination issues (as shown in Figure 1b,c), which makes the cable accessory become the weakest link in the entire power cable system 8–10 .…”