架空导线运行温度及载流量的数值模拟分析

发布时间：2018-01-31 20:51

  本文关键词： 动态增容 导线温度场 导线载流量 ANSYS仿真 径向温度分布　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,为了满足日益增加的用电需求,输电线路的增容技术也得到了越来越广泛的研究和应用,但是,由此带来的导线长期高温工作条件逐渐成为影响线路运行安全性和可靠性的一个不容忽视的因素。目前,已有的动态增容技术,主要着眼于无线通信技术在导线表面温度的实时监测方面的应用,对于导线本身的工作温度场的形成原因和分布特点以及影响因素(风速、风向、环境温度、日照强度等)研究相对不足。而这些对于准确确定导线的温度及其载流量有重要影响,因此值得深入研究。基于此,本文以LGJ300/50为例,研究其在风速、风向、环境温度、日照强度等影响下的温度分布规律,以期为输电线路动态增容技术提供理论支撑,也为后期导线在工作条件下的材性和疲劳分析提供参考。本文的主要研究内容和结论如下:(1)以IEEE规范为例,详细介绍了导线的热平衡方程以及对流散热量、辐射散热量、日照生热量、电阻的计算方法,为有限元数值模拟提供可靠依据;(2)利用ANSYS软件建立均质导线模型(不考虑空气间隙),验证了ANSYS仿真法的准确性并明确了风速、风向、环境温度、日照强度等对导线整体温度变化情况的影响规律,为后续分析提供可靠支持;(3)利用ANSYS软件建立精细导线模型(考虑导线内空气间隙对热传导的影响及股线间的实际接触情况),验证了其分析导线径向温度分布规律的准确性;研究得出,载流量在410A~860A范围内,随着风速、风向角、环境温度、日照强度等的变化,导线径向温差在4~10℃变化,该温差对载流量的影响可达70A~80A;而现有的温度监测装置,所测量导线的温度多是导线的表面温度,以此来调整线路的输送容量则是偏于不安全的,结合现有的实时增容技术,可以通过ANSYS分析导线相应环境条件下的温度场,从而根据导线内的各点温度分布,计算最不利位置的导线允许载流量,在保证线路运行安全的基础上提高线路输送容量;(4)结合温度场的分析结果以及《IEEE规范》,对架空导线的载流量进行分析,可知风速、风向角、环境温度、日照强度对导线载流量的影响程度由大到小。最后,本文提出了导线径向温差对导线应力分析的影响,以及温度热影响区对多分裂导线温度场分析的影响,对后续工作进行了展望。
[Abstract]:In recent years, in order to meet the increasing demand for electricity, the capacitive technology of transmission lines has been more and more widely studied and applied, but. The long term high temperature working conditions of conductors have gradually become a factor that can not be ignored to affect the safety and reliability of line operation. At present, the existing dynamic compatibilization technology has been developed. This paper focuses on the application of wireless communication technology in the real-time monitoring of wire surface temperature, the formation reasons and distribution characteristics of the wire's working temperature field and the influencing factors (wind speed, wind direction, ambient temperature). The study of sunshine intensity is relatively insufficient, and these have important influence on determining the temperature and carrier flux of wire accurately, so it is worth further study. Based on this, this paper takes LGJ300/50 as an example. The temperature distribution under the influence of wind speed, wind direction, ambient temperature, sunshine intensity and so on is studied in order to provide theoretical support for power transmission line dynamic compatibilization technology. The main contents and conclusions of this paper are as follows: (1) take IEEE Code as an example. The heat balance equation of the conductor and the calculation methods of convection heat dissipation, radiation heat dissipation, sunshine heat generation and resistance are introduced in detail, which provides a reliable basis for the finite element numerical simulation. (2) using ANSYS software to establish homogeneous conductor model (not considering air gap), the accuracy of ANSYS simulation method is verified and the wind speed, wind direction and ambient temperature are determined. The influence of sunshine intensity on the overall temperature change of the conductor provides reliable support for the subsequent analysis. (3) the fine traverse model is established by using ANSYS software (considering the influence of air gap on heat conduction and the actual contact between strands). The accuracy of the radial temperature distribution analysis is verified. The results show that the radial temperature difference of conductors varies at 410 鈩，

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