高电压技术2024，Vol.50Issue(3)：1043-1052,10.DOI:10.13336/j.1003-6520.hve.20230247
计及硅橡胶应力松弛的电缆接头界面压力演变仿真研究
Simulation Study of Interfacial Pressure Evolution of Cable Joints Considering Stress Relaxation of Silicone Rubber
伊德伦 1郑莹莹 1蒋浩月 1高建 1武康宁 1李建英1
作者信息
- 1. 西安交通大学电工材料电气绝缘全国重点实验室,西安 710049
- 折叠
摘要
Abstract
The electrical properties of high-voltage cable joints are closely related to the interface pressure between sili-cone rubber and cross-linked polyethylene(XLPE).In order to explore the evolution of the interface pressure of the actual cable joint,a simulation study of the interface pressure of the 220 kV cable joint was carried out considering the stress re-laxation phenomenon of silicone rubber during the aging process in this paper.First,the finite element model was established based on the characteristics of the physical field of the cable joint,and the initial pressure distribution of the silicone rubber-XLPE interface of the cable intermediate joint was determined.Second,the finite element analysis results were verified by the analytical solution of the mechanical theory calculation and the measured results of the preset pres-sure sensor.Then,combined with the results of thermo-mechanical aging experiments of silicone rubber,a method was proposed to convert the stress relaxation of silicone rubber into the change of interference during the aging process,and a multi-parameter finite element analysis method considering the stress relaxation and elastic modulus changes in the aging process was obtained.This method was successfully applied to analyze the interfacial pressure between insulating silicone rubber and XLPE in cable joints.According to the analysis,the aging of silicone rubber leads to stress relaxation and in-crease in elastic modulus at the same time.The simulation results considering the elastic modulus and stress relaxation show that the interface pressure decreases from 0.156 MPa to 0.129 MPa,0.125 MPa and 0.107 MPa after ther-mo-mechanical aging at 100℃,125℃and 150℃for 2040 h,1680 h and 1200 h,respectively.It is shown that the effect of stress relaxation on the interface pressure is more significant,the interface pressure decreases with the increase of aging time,and the increase of temperature will significantly accelerate the attenuation process of the interface pressure of the intermediate joint.The results of this paper can provide a theoretical basis for improving the design and operation re-liability of cable intermediate joints.关键词
电缆中间接头/界面压力/有限元分析/热机械老化/应力松弛/硅橡胶Key words
cable intermediate joint/interface pressure/finite element analysis/thermo-mechanical aging/stress relaxa-tion/silastic引用本文复制引用
伊德伦,郑莹莹,蒋浩月,高建,武康宁,李建英..计及硅橡胶应力松弛的电缆接头界面压力演变仿真研究[J].高电压技术,2024,50(3):1043-1052,10.
