Abstract
The shielding tube and stress cone of the intermediate joint of XLPE cable accessory make the potential distribution along the insulation surface linearized to optimize the electric field and. By establishing the finite element model of the intermediate joint of 10kV cable accessory, the electric field distribution of different structure shielding tube and stress cone in different position of the joint is simulated and analyzed. The results show that the structure of shield tube and the position of stress cone are also a parameter characteristic which can not be ignored in the design, and they have a great influence on the distribution of the field strength of the intermediate joint. On the basis of finite element analysis, the optimum shape of shield tube and the best position of stress cone are obtained by comparing and analyzing the variation law of electric field intensity.
Highlights
Cable accessory plays an important role in the connection and transition of power transmission lines, and is an indispensable part to ensure the normal operation of power system
The stress cone can significantly improve the field strength concentration at the edge of the metal sheath and the shielding layer, so that the field strength tends to be evenly distributed[6], and avoid problems such as temperature rise caused by local electrical stress concentration, aging of insulating materials and even breakdown of cable joints in long-term operation of cable joints
When the shielded tube at the middle joint of the cable is destroyed, the shielding effect of the electric field is weakened to some extent, and the external field strength increases, which has a great influence on the steady operation of the accessories
Summary
Cable accessory plays an important role in the connection and transition of power transmission lines, and is an indispensable part to ensure the normal operation of power system. The research of cable accessories at home and abroad mainly focuses on the effect of artificial defects (knife marks, burr tips, metal particle suspension, etc.) on the electric field distribution of the accessories[1]. When the shielded tube at the middle joint of the cable is destroyed, the shielding effect of the electric field is weakened to some extent, and the external field strength increases, which has a great influence on the steady operation of the accessories
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