聚合时空特征的新疆750 kV特高压输电线路缺陷关联分析

Defects association analysis of 750 kV UHV transmission lines in Xinjiang by combining spatial-temporal characteristics

输电线路缺陷的危害性小于故障,但发生频率要远高于故障,而且缺陷可由量到质转变为严重故障。为了保障线路的正常运行,必须对缺陷防患于未然。在经典Apriori关联分析方法基础上进行改进,新方法从时空特征的角度,结合气象外力、设备、地形和缺陷进行联合关联分析,可找出线路缺陷发生的关联因素。以新疆750 k V特高压输电线路为例,所提方法发现2012年至2015年新疆750 k V特高压输电线路的缺陷关联因素表现出以下特点:大风是缺陷主要外力因素,自身主要因素是锁紧销缺损情况,空间上与杆塔所在的纬度(北纬43~43.5°)、坡向(158~202°)和杆塔高(50~55 m)有关,气象特征上24×7 h持续保持在175~235°的风向与缺陷关联。

Defects of transmission lines are less harmful than faults, but the defects＇ frequency is much higher than the faults＇, and defects can change to serious faults when their amount increases. In order to protect the normal running of transmission line, it needs to take precautions against the defects. Based on the classical association analysis method Apriori, an improved method is proposed, which could fred out key association factors of defects by combining the meteorological external force, equipment, terrains and defects in the spatial-temporal viewpoint. Taking Xinjiang 750 kV UHV transmission line as an example, it is found that the defects of 750 kV UHV transmission lines in Xinjiang show the following characteristics from year 2012 to year 2015： strong wind is the main external meteorological factor of defects, and their internal factors are the damage and loss of steady pins. In the spatial aspect, the latitude （N43-43.5 degree）, aspect （158-202 degree） and towers＇ height （50-55 meters） are strongly associated with defects. Especially, in meteorological aspect, in 24×7 hours the wind direction keeping in the 175 to 235 degree is strongly associated with defects.