高压XLPE电缆绝缘层动态热行为建模的优化分析  

Research on dynamic thermal evaluation of high voltage XLPE cable insulation layer

作　　者：陈文教 卞佳音 张珏 黄宇平 李俊 吴智恒 刘刚 CHEN Wenjiao;BIAN Jiayin;ZHANG Jue;HUANG Yuping;LI Jun;WU Zhiheng;LIU Gang(Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510310,China;Guangdong Key Laboratory of Clean Energy Technology,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州510310 [2]华南理工大学广东省绿色能源技术重点实验室,广东广州510640

出　　处：《电力科学与技术学报》2023年第4期123-133,共11页Journal of Electric Power Science And Technology

基　　金：国家高技术研究发展计划(“863”计划)(2015AA050201)。

摘　　要：为了解决现有高压XLPE电缆热评估计算模型在连续波动负荷下计算精度不足的问题,分析传统方法(包括IEC 60853-2和热电等效方法)中采用恒定绝缘层热容分配系数时的计算误差累积,提出电缆绝缘集总热模型的优化方法,以减少可能出现的误差累积。通过电缆动态温升实验,验证所提出的改进热电等效(TEE)方法的可靠性。分析结果表明:改进TEE方法能够较好地反映电缆在连续波动负荷下真实的热性能,其导体温度计算误差维持在2.5℃以下。利用改进后的方法对电缆进行热评估,能够较大限度地提高电缆的资产利用率,并确保电缆安全可靠运行。In order to solve the problem of insufficient calculation accuracy in existing high-voltage XLPE cable thermal evaluation models under continuously fluctuating loads,this paper explores the traditional methods(including IEC 60853-2 and thermoelectric equivalent method)using constant insulation layer heat capacity distribution coefficient,and the accumulated calculation errors are investigated when subjected to continuously fluctuating loads.An optimized approach for the lumped thermal model of cable insulation is proposed to mitigate potential error accumulation.The proposed improved thermoelectric equivalent(TEE)method is validated through the dynamic cable temperature rise experiments.The analysis reveals that the improved TEE method can better predict the real thermal performance of cables under continuously fluctuating loads,with conductor temperature calculation errors being maintained within 2.5℃.The methodology developed in this paper paves a way for electricity utilities to enhance cable utilization while ensuring cable reliability.

关 键 词：电力电缆 绝缘热行为 动态热额定值 连续波动负载 集总热模型 

分 类 号：TM247[一般工业技术—材料科学与工程]