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。文中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,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;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。最后,建议在上述研究方法的基础上,针对具体的实际问题,提出后续研究的内容及方法。
The ampacity of power cables is difficult to be determined due to influences by installation method, operation conditions and ambient conditions. It is of great importance to calculate accurately the cable ampacity under complicated conditions in order to ensure cable safety and economic operation. In this paper, the evolution of the analytical method and numerical method for ampacity computation is presented. The deficiency of the NM theory was analyzed and improvement was proposed. The basic content and limitations of the ampacity computation standard IEC 60287 were described. The application of the three main numerical methods （finite difference, boundary element and limit element） for ampacity computation was introduced. The characteristics of the three methods were discussed. Finally, in terms of the practical problems, the content and method for further study were proposed based on the achievements of the a. m. study.
出处
《电线电缆》
2010年第2期4-9,共6页
Wire & Cable
关键词
电力电缆
温度场
载流量
解析计算
数值计算
power cable
temperature field
ampacity
analytical method
numerical method
