摘要
针对以往地线热稳定性计算方法的不足,使用有限元方法计算架空地线的热稳定性,综合考虑了多材料、趋肤效应的影响,精确度更高。计算了短路电流下LGJ-70/40地线的温度场,分析了不同电流分布对地线温度场的影响,计算结果与文献中使用截面校验法得到的结果对比,证明截面校验法计算得到的地线热容量偏大。根据工程实际,分析了芦张线故障短路后地线断线的原因,并给出了稳定电流的推荐值和计算方法。
In view of the shortcomings of the method for calculating the thermal stability of the ground wire,the finite element method is used to calculate the thermal stability of the overhead ground wire,taking into account the influence of multi-material and skin effect,and the accuracy is higher.The temperature field of LGJ-70/40 ground wire under short-circuit current is calculated,and the influence of different current distribution on the ground wire temperature field is analyzed.The calculation results are compared with those obtained by using the cross-section verification method in the literature,which proves that the ground wire heat capacity calculated by the cross-section verification method is too large.According to the actual project,the reasons for the ground wire disconnection after the Luzhang line′s fault and short circuit are analyzed,and the recommended value and calculation method of the stable current are given.
作者
高琦
王璋奇
GAO Qi;WANG Zhangqi(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电工技术》
2021年第13期111-113,115,共4页
Electric Engineering
基金
国家电网有限公司科技项目(编号1600/2020-56001A)。
关键词
架空地线
热稳定性
短路
有限元
温度场
overhead ground wire
thermal stability
short circuit
finite element
temperature field
