基于在线监测系统的架空线路覆冰力学模型及其应用

发布时间：2018-02-21 00:44

本文关键词： 覆冰称重法风偏角倾斜角影响因素耐张塔工程应用　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前的输电线路覆冰监测技术大多基于称重法原理进行，该方法简单、直接、技术应用相对成熟，因而被广泛用于国内的架空线路覆冰在线监测系统中。南方电网输电线路灾害（覆冰）预警系统虽然应用了基于称重法的直线塔覆冰计算模型，但对角度、拉力传感器误差及个数、垂直档距等因素的影响规律未细致考虑，且没有提出耐张塔的覆冰计算模型和考虑其模型各种因素的影响，造成覆冰监测系统直线塔模型不完善，耐张塔无法监测的问题。本论文首先介绍了南方电网输电线路灾害（覆冰）预警系统的总体结构及其存在的问题。针对应用于覆冰监测系统原有的直线塔计算模型不完善问题，，将直线塔计算模型细化为I串、双I串、V串、双V串和八字串等五种串型下的模型，对包括风偏角及倾斜角、拉力传感器误差、垂直档距和拉力传感器个数等直线塔计算模型影响因素进行了分析。针对覆冰监测系统缺少耐张塔覆冰计算模型的问题，本论文提出了耐张塔理论计算模型和简化计算模型，并分别对不同位置的张力、代表档距和风偏角三个因素对覆冰计算的影响进行了不同覆冰工况下的研究，验证了简化计算模型。最后采用图像与冰厚变化曲线对比分析的方法，验证了架空线路直线塔和耐张塔覆冰计算模型工程具有良好的应用效果，并阐述了工程应用中模型存在的问题及解决方案。在分析覆冰模型影响因素时，由于模型的参数、不同电压等级线路较多，设计条件下的导线张力及覆冰工况也多种多样，导致不可能对所有情况进行全部分析，因此得到的结论的一般性还有待进一步提高。
[Abstract]:Most of the current ice monitoring techniques for transmission lines are based on the weighing method. This method is simple, direct, and its application is relatively mature. Therefore, it is widely used in the on-line monitoring system of overhead line icing in China. Although the transmission line disaster (icing) early warning system of Southern Power Grid applies the calculation model of linear tower icing based on weighing method, the angle of the system is analyzed. The influence of the error and number of tension sensors, vertical spacing and other factors are not considered carefully, and the calculation model of icing of tension tower is not put forward, and the influence of various factors on the model is considered, which results in the imperfect model of line tower of icing monitoring system. A problem that cannot be monitored by a tensioning tower. This paper first introduces the overall structure and existing problems of the transmission line disaster (icing) early warning system in Southern Power Grid, aiming at the imperfect calculation model of the linear tower used in the icing monitoring system. The calculation model of linear tower is divided into five types: I string, double I string V string, double V string and eight character string. The influence factors of linear tower calculation model, such as vertical distance and the number of tension sensors, are analyzed. In view of the lack of icing calculation model of tension tower in icing monitoring system, the theoretical calculation model and simplified calculation model of tension tower are put forward in this paper. The effects of three factors, namely tension at different positions, distance between wind and wind, on the calculation of icing are studied under different icing conditions, and the simplified calculation model is verified. Finally, the method of contrast analysis between image and ice thickness variation curve is adopted. It is verified that the calculation model engineering of overhead line tower and tension tower has good application effect, and the problems and solutions of the model in engineering application are expounded. When analyzing the influencing factors of the icing model, because of the parameters of the model, there are more lines with different voltage levels, the lead tension and icing conditions under the design conditions are also varied, which makes it impossible to analyze all the cases. Therefore, the generality of the conclusion needs to be further improved.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM752

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