考虑降雨的埋地电缆动态负载能力预测  

Dynamic Load Capacity Forecast of Buried Cable Considering Rainfall

作　　者：牛海清[1] 余佳[1] 郭少锋 许佳 王劲 王红斌 雷超平 NIU Haiqing;YU Jia;GUO Shaofeng;XU Jia;WANG Jin;WANG Hongbin;LEI Chaoping(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Xianning Power Supply Company Maintenance Branch,Xianning,Hubei 437000,China;Guangzhou Power Supply Bureau Co.,Ltd.,Guangzhou 510410,China)

机构地区：[1]华南理工大学电力学院,广州510640 [2]咸宁供电公司检修分公司,湖北咸宁437000 [3]广州供电局有限公司,广州510410

出　　处：《南方电网技术》2018年第1期41-47,共7页Southern Power System Technology

基　　金：国家高技术研究发展计划(863计划)项目(SS2015AA050201)~~

摘　　要：运行电缆的负载能力主要受周围土壤的热阻系数、比热容和环境温度等热特性参数的影响。然而目前有关电缆周围土壤热特性参数的研究不多,且鲜有考虑降雨的影响。以广州五山地区为典型代表,检测了土壤温度、热阻系数和比热容等土壤热特性参数,研究了降雨对土壤热特性参数的影响。结合输电电缆负载能力动态预测模型和土壤热特性参数相关研究,计算了不同初始状态下电缆的应急负载能力。最后考虑降雨影响,分析了降雨量和降雨持续时间对电缆应急负载能力的影响。研究结果将为研究电缆短时应急能力或短路故障时的导体发热问题等提供理论支持。The load capacity of the operating cable is mainly affected by the thermal parameters of surrounding soil,such as thermal resistance coefficient,specific heat capacity,and ambient temperature.However,at present,little research has been done on the thermal characteristics of the soil around cables,and the influence of rainfall is seldom considered.Guangzhou Wushan area is taken as a typical representative,its soil temperature,thermal resistance coefficient and specific heat capacity are measured,and the effects of rainfall on soil thermal parameters are studied.Based on the dynamic load capacity forecasting model of transmission cable and the correlational studies of soil thermal parameters,the emergency load capacity of cables in different initial conditions is calculated.Finally,the influence of rainfall and its duration on the emergency load capacity of cables is analyzed.The research results can provide a reference to the studies of short-term emergency load capacity of cable and cable heating during short-circuit fault.

关 键 词：埋地电缆 负载能力 预测 降雨 土壤热特性 

分 类 号：TM751[电气工程—电力系统及自动化]