电力电缆载流量计算的方法与发展.doc

文档介绍：电力电缆载流量计算的方法与发展
郑雁翎1,2,王宁1,李洪杰1,张冠军1
(1. 西安交通大学电气工程学院,电力设备电气绝缘国家重点实验室,西安,陕西710049
2. 宝鸡文理学院电子电气工程系,宝鸡,陕西721007)
摘要:电力电缆的载流量因受敷设方式、运行条件和周围环境等因素的影响而不易确定,准确计算各种复杂条件下电缆的载流量,对确保电缆的安全、经济运行具有重要的意义。本文介绍了电力电缆载流量计算的解析法和数值法的发展过程,首先分析了NM理论的不足和对它的改进,以及IEC60287载流量计算标准的基本内容和应用局限。其次介绍了三种主要的数值计算方法(有限差方法、边界元法和有限元法)在电缆载流量计算中的应用,并对这三种数值计算法的特点进行了论述。
关键词:电力电缆;温度场;载流量;解析计算;数值计算
Method and Development of putation for Power Cable
ZHENG Yan-Ling1,2, WANG Ning1, LI Hong-Jie1, ZHANG Guan-Jun1
(1. State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering,
Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;
2. Department of Electronic and Electrical Engineering, Baoji University of Arts and Sciences, Baoji, Shaanxi 721007, China)
Abstract: The ampacities of electric power cables is mainly determined by temperature limitation, laying condition and the surrounding environment, a systematic method of putation is of paramount importance to determining the feasibility of extending cable life. In this paper, the current-carrying putation method and its development have been discussed. Firstly, the deficiencies of NM method and some improvements have been done to this method have been analyzed, the limitation of the IEC60287 power-carrying capacity calculation standard has been discussed too. Then three major numerical calculations which are used in the put