摘要
为了保证地下电缆的可靠运行,电力部门的常规做法是在电缆表面安装分布式光纤温度传感器(DTS),对电缆的热状态进行直接监测。由于电缆的载流量取决于导体的持续运行最高温度,因此基于传热学原理,利用通用有限元软件对计算场域进行自动划分,通过提取得到的单元与节点信息自主编制有限元计算程序,结合实时变化的负荷数据及DTS测量的电缆表面温度,分析计算了单芯电缆的瞬态温度场。通过110kV 1×630 mm2交联聚乙烯电缆的试验研究,对比电缆导体温度的测量值和计算值,结果表明,自主编制的有限元计算程序能够准确地计算电缆的瞬态温度场,为电缆安全高效的运行提供了有效的理论依据。
For reliable operation of underground power cables, it has been a common practice that power utilities in- stall advanced distributed temperature sensing （DTS） systems on cable surface to directly monitor their thermal condi-tion. The ampacity of power cable depends on the maximum allowable conductor temperature. Based on the principle of heat transfer theory, and combined with real-time load data and the surface temperature of cable measured by DTS, the transient temperature field of single-core power cable was analyzed by finite element method which was performed using the element and the node information of thermal field domain discretized by the general finite element software. A test was carried out to verify the result of calculation of a 110 kV 1 × 630 mm^2 XLPE cable. Comparing the compu-ted temperature of cable conductor with that measured, the results showed that cable transient temperature field can be obtained by the proposed method, which provides an effective theoretical basis for the reliable and efficient opera-tion of the cable.
出处
《电线电缆》
2013年第6期7-11,共5页
Wire & Cable
基金
江苏省产学研前瞻性联合研究项目(BY2012128)
关键词
电力电缆
有限元法
瞬态温度场
载流量
光纤温度测量
power cable
finite element method
transient temperature field
ampacity
distributes temperaturesensing
