基于输电线路垂直档距变化特征的等值覆冰厚度模型研究

针对电网防冰抗冰各业务的具体需求及现有覆冰监测终端受环境的影响使得多个测量值不够准确,从而增加架空线覆冰厚度观测值误差的问题,利用覆冰监测终端历史拉力值、气象因子测量数据,经过对历史拉力值数据合理的质量控制,采用相对值方法并结合实际测量技术手段,建立了考虑线路设计冰厚、垂直档距实时变化特征的更加精确的输电线路等值覆冰厚度计算模型,用于模拟两个冰期内线路等值覆冰厚度,并与实际观测结果进行对比。结果表明,AB相、地线垂直档距随覆冰厚度均呈非线性变化趋势,总体呈现出随覆冰厚度的增加而逐渐减小的变化趋势,且地线变化幅度大于AB相线;线路等值覆冰厚度与监测终端拉力值呈正相关性关系,计算出的线路等值覆冰厚度与同期的气象因子覆冰条件相一致,且模拟结果与实际观测结果误差较小。

Study on Equivalent Icing Thickness Model Based on Variation Characteristics of Vertical Distance of Transmission Line

The specific needs of the anti-icing business of the grid and the impact of the existing icing monitoring terminals make the multiple measurements not enough accurate to increase the error of the observation error of the icing thickness of the overhead line. In this paper, we use the icing to monitor the historical value of the terminal tension. After the reasonable quality control of the historical pull value data, the relative value method and the actual measurement technique were used to establish the accurate calculation model of the equivalent icing thickness of transmission line by considering design icing thickness and the characteristics of vertical span range. The model was used to simulate the equivalent icing thickness of the two glaciations and to compare with the actual observation values. The results show that the vertical span of AB phase and ground line appears a non-linear trend with the thickness of icing, and the overall trend is decreasing with the increase of icing thickness, and the variation range of ground line is larger than that of AB phase line. The equivalent icing thickness of the line is positively correlated with the tension value of the monitoring terminal. The calculated equivalent icing thickness is consistent with the meteorological factor icing condition of the same period, and the simulation result is less error compared with the actual observation.