中文摘要：

随着城市用电需求量不断上升,面对紧急供电而需施加应急负荷时,配电网电缆能否承受应急负荷,以及导体温度到达稳定限值90℃所需时间是电力调度部门急需解决的问题。综合有限元和解析法,提出10 kV三芯电缆应急能力评估方法。首先,采用有限元法建立三芯电缆稳态温度场分析模型。其次,根据三芯电缆暂态热路等效模型推导出应急温升特性表达式,并借助数据拟合方法得到应急时间的四阶计算式。最后,设计了三芯电缆应急温升试验。仿真与试验结果表明,所提方法可有效评估三芯电缆应急能力。

英文摘要：

With the increasing demand for electricity in city, when three-core cables need to load emergency loads for emergency power supply, it is urgent for power dispatching department to acknowledge whether the cable in distribution network can resist the emergency loads, and the time required for the conductor temperature to reach the stabilization limit of 90℃. The method of emergency capability assessment for 10 kV three-core cable is proposed based on finite element method and analytical method. Firstly, the finite element method is used to establish the steady-state temperature field analysis model of three-core cable. Secondly, according to the transient thermal circuit equivalent model of three-core cable, the expression of emergency temperature rise characteristic is deduced. And the fourth order formula of emergency time is obtained by means of data fitting. Lastly, the emergency temperature rise experiments of three-core cable are designed. The simulation and experimental results show that the proposed method can effectively evaluate the emergency capability of three-core cable.