台风暴雨灾害下的110 kV线路倒塔与断线事故评估方法

沿海地区台风暴雨灾害频发,极易引发输电线路倒塔、断线等事故.为此,针对110 kV输电线路提出一种同时考虑台风暴雨灾害下倒塔与断线事故的评估方法.首先,分别建立台风与暴雨荷载模型,刻画台风风场中任意位置的风雨荷载;其次,对110 kV线路不同的输电塔型分别建立有限元模型,考虑风雨荷载的相关性,分析风雨荷载下线路和铁塔的...

Assessment Method of Tower Falling and Line Disconnection Accidents for 110 kV Line in Typhoon and Torrential Rain Disaster

Typhoon and torrential rain disasters occur frequently in coastal areas,which is highly possible to cause accidents such as tower falling and line disconnection of transmission lines.Therefore,an evaluation method of tower falling and line disconnection accidents considering typhoon and torrential rain disasters is proposed for 110 kV transmission lines.Firstly,load models in typhoon and torrential rain are established respectively to describe the wind and rain loads at any position in the typhoon wind field.The finite element models for the different transmission tower types of 110 kV lines are established respectively.Considering the correlation of wind and rain loads,the dynamic response of lines and towers with wind and rain loads is analyzed.Based on the structural reliability theory,the probability expressions of tower falling and line disconnection are derived,the mechanism effects of different tower types,purposes and wind angles on tower falling are studied,the weak links of power grid are analyzed,and the tower falling and line disconnection accidents of 110 kV lines in typhoon and torrential rain disasters are evaluated.Finally,the simulation uses the actual power system and real typhoon data in a region of China to verify the applicability of the proposed assessment method.