架空地线临界融冰电流估算方法研究

【摘要】 架空线路覆冰是影响电网正常运行较为严重的灾害之一，尤其地线更易出现覆冰，有必要对架空地线直流融冰电流进行计算，而现有的经验公式及应用较多的布尔斯道尔夫融冰电流计算公式较为复杂，且有些参数测量困难。因此，该文提出一种用于快速估算已知架空地线型号在不同风速、环境温度、覆冰厚度条件下临界融冰电流的方法，通过分析地线融冰物理过程，利用有限元软件搭建仿真模型，经模型计算得到数据集，然后采用多元线性回归拟合得到相关变量的函数表达式，并与计算值进行对比。更多还原

【Abstract】 Overhead line ice is one of the more serious disasters affecting the normal operation of the power grid, especially the earth wire is more prone to ice, it is necessary to calculate the overhead earth wire DC melting current, and the existing empirical formulas as well as the application of the more Bursdorff melting current formula is more complex, and some of the parameters are difficult to measure. Therefore, this paper presents a method for quickly estimating the critical ice melting current of known overhead earth wire under the conditions of different wind speed, ambient temperature and icing thickness. The simulation model is built by finite element software, the data set is calculated, and then the function expression of related variables is obtained by multiple linear regression fitting, and compared with the calculated value.更多还原