作　　者： ; ; ; ; (傅闯）; (饶宏）;

机构地区： 华南理工大学电力学院

出　　处： 《高电压技术》 2012年第11期3000-3007,共8页

摘　　要： 输电线路覆冰在线监测系统可以实现对架空输电线路覆冰状况的实时在线监测。为此,基于输电线路覆冰在线监测系统的监测数据,统计得到了数据特征和覆冰数据聚集类型;发现测量终端普遍仅记录厚度>2mm的线路覆冰,且在覆冰期间无法测得风速及风向;有效覆冰数据主要以短期振荡、中短期维持、较长期维持以及完整发展过程4种方式聚集,其中具有明显增长和消融阶段的完整过程覆冰对线路威胁最大。此外,在风速和风向等微气象监测参量缺失的情况下,对长期低温高湿环境下的覆冰发展趋势进行了整体和局部的分析,发现单位时间覆冰增长质量基本满足均值为0、过峰度、正偏离的类正态分布,且覆冰增长阶段呈线性增长态势,一次函数模型拟合效果较指数模型更好。结果表明:只有持续时间较长的低温雨雪冰冻天气环境下形成的覆冰才可能对线路安全运行造成威胁;单位时间覆冰增长质量近似服从正态分布;覆冰稳定增长时期,覆冰质量序列与时间呈相关度很高的一次线性函数关系,可考虑建立简单的线性增长模型应用于线路覆冰预警。 Transmission line online monitoring system can monitor the real-time icing condition of overhead transmission lines.We obtained characteristics and aggregation types of icing data on the basis of the icing data measured from an online monitoring system.It is found that most measuring terminals generally record ice more than 2mm thick only,and the wind speed and wind direction cannot be measured under icing condition.Valid icing data mainly gathers in four types,including the short-term oscillation,the short and medium term maintenance,the long-term maintenance,and the whole icing process,in which the whole icing process including obvious ice growing and melting periods has the biggest threats to transmission lines.Moreover,in the absence of some meteorological variables such as wind speed and direction,the icing tendency in low-temperature and high-humid environment is analyzed,revealing that the icing increment per quarter approximately follows a normal distribution with an average of zero,over-kurtosis and positive-skewness.Moreover,the icing weight increases linearly in growing period,which is better fitted by equations of linear function than that of exponential function.Conclusions can be drawn that：only the ice which is formed under long-term,low temperature,and freezing weather with rain and snow is likely to threaten the transmission lines;the icing increment per quarter approximately follows a normal distribution;in the steady icing growing period,the increment of icing quality shows a very strong linear relationship with time which can be used for icing prediction by constructing linearly increasing models.

关 键 词： 输电线路 覆冰 在线监测系统 数据特征 统计分析 拟合

领　　域： [电气工程]