Simulation calculation of thermal stress distribution of composite interface in operation of high voltage cable joint under electro-thermal coupling

被引：0

作者：

Yang X. ^{[1
]}

Liu Z. ^{[1
]}

Liang Z. ^{[1
]}

Qiu W. ^{[2
]}

Cui J.-J. ^{[2
]}

Zhong Q.-D. ^{[3
]}

机构：

[1] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha

[2] Zhuhai Power Supply Bureau of Guangdong Power Grid Co. Ltd, Zhuhai

[3] Guangdong Annuo New Material Technology Co. Ltd, Foshan

来源：

Liang, Zhen | 1600年 / Editorial Department of Electric Machines and Control卷 / 24期

关键词：

Electromagnetic-thermal-stress coupling; HV power cable joint; Interface of composites; Secondary distortion;

D O I：

10.15938/j.emc.2020.10.011

中图分类号：

学科分类号：

摘要：

At present, the research on the failure mechanism of high-voltage cable joints mainly focuses on calculation of electric field, temperature field and initial mechanical stress distribution, and rarely considers the distortion problem of the interface stress distribution of composite materials during operation. The faulty development of high-voltage cable joints involves a complex process in which the electromagnetic-thermal-stress fields are coupled to each other. The distortion of the stress distribution at the interface of the composite material not only accelerates the aging process of the insulating material, but also reduces the discharge voltage along the interface surface. 220 kV high-voltage cable intermediate joint was used as the prototype, and the electromagnetic-thermal-stress coupling simulation model of the high-voltage cable joint was established by using the finite element analysis software. Based on the model, the calculation results of the electric field, temperature field and thermal stress distribution under the normal operating conditions of the cable joint and the insulation material containing impurity defects were obtained. The secondary distortion of the thermal stress distribution of the composite interface under typical defects was analyzed. The results show that the thermal stress of composite interface increases by 27.32 times under the condition that the cable joint contains impurity particles, and the secondary distortion of thermal stress far exceeds the secondary distortion of electric field and temperature field. It is believed that the secondary distortion of the thermal stress distribution of the composite interface is an important cause of the failure of the high-voltage cable joint. This research provides a theoretical reference for cable accessory failure analysis and structural optimization design, which has important practical and practical value for improving the insulation performance of cable joints. © 2020, Harbin University of Science and Technology Publication. All right reserved.

引用

页码：100 / 108

页数：8

共 24 条

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