摘要
隧道电缆暂态温升分析是决定隧道电缆系统安全稳定运行的重要因素。该文引入Laurent级数展开,对节点导纳矩阵的求解过程进行简化,进而得到隧道电缆全线金属护套环流分布。同时考虑到隧道电缆敷设方式不完全对称的情况及导体电阻受到温度实时变化的影响,结合IEC-60853标准,推导出计及金属护套环流和时变导体电阻的隧道电缆系统暂态温升计算方法。基于经校正的解析模型和数值模拟法,对220 kV隧道高压电缆工程开展暂态温升研究。结果表明:电缆系统暂态温升受到敷设方式、布置间距、环境温度和运行负荷多个因素的影响。在日周期负荷电流作用下,隧道电缆系统分别以一字形、品字形方式敷设,数值模拟法与经校正的解析模型所得到的缆芯暂态温升之间平均相对误差分别为3.616%和4.515%,均处于误差可接受范围之内(小于5%)。而两者计算出的外被层暂态温升基本一致,其温升最大分别相差1.214和1.248℃。结果可为隧道电缆系统暂态温升分析提供一种新的计算方法,具有一定的工程应用参考价值。
Analysis of transient temperature rise in tunnel cables is a critical factor in determining the safe and stable operation of tunnel cable systems.The Laurent series expansion is introduced to simplify the process of solving the node admittance matrix,so as to obtain the distribution of metal sheath circulation along the entire tunnel cable.Considering the asymmetrical laying method of tunnel cables and the impact of varying temperatures on conductor resistance,in conjunction with the IEC-60853 standard,calculation method is derived for the transient temperature rise in the tunnel cable system that takes the influence of metal sheath circulation and time-varying conductor resistance into account.Based on the corrected analytical model and numerical simulation method,the study on the transient temperature rise is conducted focusing on the 220 kV high-voltage tunnel cable project.The results indicates that the transient temperature rise in the cable system is influenced by multiple factors such as the laying method,laying spacing,ambient temperature,and operating load.Under daily cycle load current,with tunnel cables laid in horizontal and trefoil methods,the average relative errors between the transient temperature rises of the cable core obtained by the numerical simulation method and corrected analytical model are 3.616%and 4.515%,respectively,both within the acceptable range(less than 5%).The transient temperature rises of the outer sheath calculated by both methods are essentially consistent,with maximum temperature rise differences of 1.214 and 1.248℃,respectively.The work provides a new calculation method and a reference for engineering applications in analyzing the transient temperature rise of tunnel cable systems.
作者
王恩哲
陈向荣
苏宁杰
张添胤
阴凯
乐军耀
WANG Enzhe;CHEN Xiangrong;SU Ningjie;ZHANG Tianyin;YIN Kai;LE Junyao(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;China Energy Engineering Group Zhejiang Electric Power Design Institution,Hangzhou 310012,Zhejiang Province,China)
出处
《中国电机工程学报》
北大核心
2025年第17期6979-6992,I0031,共15页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
中国能源建设集团浙江省电力设计院有限公司科技项目(WS2022001)。
关键词
隧道电缆系统
Laurent级数展开
护套环流
解析模型
数值模拟法
暂态温升
tunnel cable system
Laurent series expansion
sheath circulation
analytical model
numerical simulation method
transient temperature rise
作者简介
王恩哲(1999),男,硕士研究生,主要从事电力系统过电压和电力电缆稳态计算的研究工作,wangxiaobinllm@163.com;通信作者:陈向荣(1982),男,教授,博士生导师,主要研究方向为先进电气材料与高压绝缘测试技术,先进电力装备与新型电缆系统,高电压新技术等,chenxiangrongxh@zju.edu.cn。
