220kV高压电缆接头保护装置端头部位的折线形设计与测试  

Folding line design and test for the front part of joint metal protective device on 220kV high-voltage cable

作　　者：崔江静 刘真 仇炜 黄顺涛 杨鑫[2] 钟淼龙 孙浩天 CUI Jiangjing;LIU Zhen;QIU Wei;HUANG Shuntao;YANG Xin;ZHONG Miaolong;SUN Haotian(Zhuhai Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhuhai 519000,China;School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]广东电网有限责任公司珠海供电局,广东珠海519000 [2]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2021年第6期94-103,共10页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金青年基金(51407013);广东电网有限责任公司科技项目(GDKJXM20161905)。

摘　　要：针对现有的高压电缆接头防爆装置在端头部位普遍存在的应力集中问题,提出通过优化折线偏折角度和法兰尺寸的方法,均衡保护装置端头部位应力分布。利用温度场、流场和位移场耦合的有限元计算方法,对不同结构下220kV金属型高压电缆接头防爆壳体端头部位内壁承受的应力进行计算,得到内部端头处的压力分布。通过仿真分析,结合保护装置实用性和经济性进行综合考虑,最终选取220kV金属型高压电缆接头防爆装置端头部位折线偏折角度α为60°;在端头和壳体连接处增加法兰,确定其最优结构为法兰的高度为50mm,厚度为20mm,最终使保护装置内壁应力畸变系数降低至1.48。通过折线形端头的220kV高压电缆接头防爆装置的爆破应力测试,验证设计方法的可靠性。通过对比折线型端头结构和弧度型端头结构,认为在相同的技术条件下,折线型端头结构具有更好的经济效益。为防爆装置设计提供可靠的理论计算方法。Aiming at the stress concentration problem existing in the front part of the high-voltage cable joint protective device,this paper presents a method to balance the stress distribution by optimizing the deflection angle of the folding line and the flange size.Finite element method of temperature field,flow field and displacement field coupling is adopted to calculate the stress value of the front part of joint protective device inner cavity on the 220kV metal cable under different structure.Thus,the stress distribution of protective inner cavity is obtained.Through simulation analysis,combined with the practicability and economy of the protective device,the final chosen deflection angleαof the 220kV metal cable joint explosion proof device folding line on the front part is 60°.The optimal structure of the flanges added at the front-to-shell connections is determined as 50mm in height and 20mm in width,which can reduce the stress distortion coefficient of the inner wall of the protective device to 1.48.The reliability of the design method is verified by the explosion stress test of the protective device of 220kV high-voltage cable joint with broken line terminal.By comparing the polygonal structure to the curved structure,it is considered that under the same technical conditions,the polygonal structure has better economic benefits.The paper provides a reliable theoretical calculation method for the design of the protective device.

关 键 词：高压电缆接头 防爆装置 端头结构优化 仿真设计 爆破应力测试 

分 类 号：TM757[电气工程—电力系统及自动化]