不同频率谐波下单芯电缆温度场仿真分析

Simulation Analysis of Single Core Cable Temperature Field with Different Frequency Harmonics

电力电缆的温度是保证其安全运行的重要参数之一,本文分析了现有电缆谐波温度场模型情况及其局限性,根据电力电缆线路产热和散热的特点,建立了电缆的电磁场-温度场耦合二维有限元分析模型。确定了电磁-热耦合场分析的边界条件,综合考虑电缆敷设方式及谐波情况下的集肤效应和邻近效应,求解得到了电缆内部电磁场分布。将得到的谐波焦耳热损耗作为热源耦合至热场模型进行计算,提出了一种多相电缆谐波温度场仿真模型,并仿真了不同频率谐波下电缆的温度分布情况。该研究可以为电力电缆线路的热分析和热老化寿命评估提供一定的参考。

The temperature of power cable is one of the important parameters that ensure its safeoperation, this paper analyzes the domestic and foreign existing cable harmonic temperature fieldmodel and its limitations. According to the characteristics that the power cable line produce heatand heat dissipation, a cable electromagnetic field-temperature field coupling of two-dimensional fi-nite element analysis model is established. The boundary conditions of electromagnetic-thermal cou-pling field analysis is determined, considering cable laying methods and skin effect and proximityeffect under the condition of harmonic, the electromagnetic field distribution inside the cable is ob-tained. Using the harmonic loss of joule heat as a heat source coupled to thermal field model to cal-culate, a kind of polyphase cable harmonic temperature field simulation model is put forward, andthe temperature distribution of the cables under different frequency harmonics is simulated. Thestudy can provide certain reference for thermal analysis and thermal aging life assessment of powercable line.