Development of calculation system for transient temperature rise of power cables in protection pipe
Development of calculation system for transient temperature rise of power cables in protection pipe
复制标题
保护管内电力电缆瞬态温升计算系统的研制
DOI：
10.1109/tdc.2002.1177748
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Imajo
中科院分区：
文献类型：
--
作者：
T. Takahashi;T. Ito;T. Okamoto;T. Imajo
根据导线的温升，确定了地下电力电缆系统的允许电流。通常稳态允许电流是根据饱和温升计算的，而短时允许电流是根据一根电缆的瞬态热传导计算的，并且只有近似的时间常数。有一个相对较大的容忍度。因此，迫切需要一套具有实际暂态负荷变化的保护管道内电力电缆暂态温升评估系统。土壤的热容量非常大，而电缆本身的热容量相对较小，因此单独计算电缆中保护管和导体的温升，再加上温升是有效的。本文编制了保护管道和电缆的计算程序，并据此提出了地下电力电缆温度评估系统。利用该系统对传统方法的公差进行了评价，并证明了该系统的有效性。
The allowable current of an underground power cable system is evaluated based on the temperature rise of a conductor. Generally the steady allowable current is evaluated based on saturated temperature rise, and the short-time allowable current is evaluated based on transient heat conduction only in one cable with approximate time constants. There is a relatively large tolerance. Therefore, an evaluation system for transient temperature rise of power cables in a protection pipe with actual transient load change is strongly required. It is effective if temperature rises of a protection pipe and a conductor in a cable are calculated individually and then subsequently added because heat capacity of soil is very large and that of the cable itself is relatively small. In this study calculation programs for a protection pipe and cable are developed and with these programs the evaluation system for underground power cable temperature is proposed. With this system, tolerance of the conventional method is evaluated and validity of this system is presented.