摘要
高压电力输送在城市一般都采用地下电缆的形式。为确保电缆能够安全 ,正常的工作 ,采用精确的方法预计地下电缆的载流量与热特性是很有意义的。本文采用有限差分法 ,用坐标组合的方式对土壤区域和电缆区域分别进行计算 ,最终可以确定任意敷设方式下电缆允许的载流量。计算与实验结果进行比较 ,认为完全可以满足实际需要。
The high-voltage electric power is generally transmitted by underground cables in urban.For the safety of the transmission,it is meaningful to accurately predict the thermal characteristics and ampacityies of underground cables.With the method of finite difference,the temperature distribution in both soil and cables is modeled separately through combinatorial coordinates.The allowable capacity of cables can be determined under all kind of laying modes.As the coefficient of heat conductivity of soil influences the ampacity of cable heavily,an experiment platform is specially developed,which can accurately measures the coefficient of heat conductivity of the soil.A series of tests are made for the reliability of the model.With the good agreement of the test results and the calculation results,it is clear that the model can provide enough precision for engineering use.
出处
《电工技术学报》
EI
CSCD
北大核心
2003年第3期59-63,共5页
Transactions of China Electrotechnical Society
关键词
载流量
有限差分法
坐标组合
导热系数
Ampacity,finite difference method,combinatorial coordinates,coefficient of heat conductivity
