摘要
为提高有限元法计算绝缘节电场的准确性和明确温度对绝缘节电场分布的影响,以完好、存在不同类型缺陷的绝缘节为研究对象,研究电场分析类型对有限元法计算的绝缘节电场分布的影响和绝缘节瞬态电场分布,研究了温度对绝缘节电场分布以及最大电场强度的影响.结果表明,除存在气隙缺陷的绝缘节稳态电场宜采用静电场计算外,其他场景下的绝缘节稳态电场分布应采用电准静态场进行计算.绝缘节在暂态过电压作用下的电场计算应使用电准静态场,且其电场为时变场.考虑温度影响时的绝缘节电场应采用电准静态场.在不同场景下,绝缘节电场分布随温度的升高逐渐趋于均匀,且在温度高于70℃时,电场分布不再随温度的变化而变化.气隙处电场强度突变量随温度的升高逐渐增大,高于70℃后突变量基本保持不变.
In order to improve the accuracy of finite element method for calculating the electric field of insulated rail joint and clarify the influence of temperature on the electric field distribution of the insulated rail joint,taking the intact insulated rail joint and insulated rail joint with different types of defects as research objects,the effect of the electric field analysis types on the electric field distribution of the insulated rail joint calculated by finite element method and the transient electric field distribution of the insulated rail joint were studied.At the same time,the influence of temperature on the electric field distribution of the insulated rail joint and the maximum electric field strength were researched.The results indicate that,except for the steady-state electric field of the insulated rail joint with gap defect,which should be calculated using electrostatic field,the steady-state electric field distribution of the insulated rail joint in other scenarios should be calculated using electric quasi-state field.The electric field calculation of insulated rail joint under transient overvoltage should use an electric quasi-static field,and its electric field should be a time-varying field.When considering the influence of temperature,the electric field of insulated rail joint should adopt an electric quasi-static field.The electric field distribution of the insulated rail joint in different scenarios gradually becomes uniform with increasing temperature,and remains unchanged when the temperature exceeds 70℃.In addition,the sudden change in field strength at the gap increases gradually with increasing temperature,and when it is above 70℃,the sudden change remains basically unchanged.
作者
李军丽
张友鹏
丁彦龙
赵斌
LI Junli;ZHANG Youpeng;DING Yanlong;ZHAO Bin(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《湖南大学学报(自然科学版)》
北大核心
2025年第10期180-192,共13页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51967010)。
关键词
绝缘节
电场分布
有限元法
电准静态场
静电场
温度
insulated rail joint
electric field distribution
finite element method
electric quasi-static field
electrostatic field
temperature
