摘要
输电线路雷击闪络率是评估电网雷击系统风险的基本指标,此外还需考虑雷击重合闸成功率、手动强送成功率、线路运行时间、线路重要性等级、供电可靠性指标和设备损害指标等重要因素。为有效评估电网雷击系统风险,提出了包含电网面向输电线路全层级对象的整体评估方法,该方法基于改进层次分析法建立电网雷害风险评估模型;此模型能针对影响电网雷害风险评估的诸多因素进行综合分析;并综合杆塔区段和逐基杆塔雷害风险评估方法建立"电网→线路→杆塔区段→杆塔"的全层级评估体系;其应用于典型500kV电网的评估结果表明该体系可有效确定防雷改造的重点线路、杆塔区段及杆塔,为电网雷电防护技术选择及策略制定提供了更科学的手段。
Lightning flashover rate is the baisc evaluation index of lightning disaster risk for power system,in addition,strike automatic reclosing success rate,manual reclosing success rate,time of line operation,line priority level,power supply reliability and equipment damages also should be considered.In order to evaluate the lightning disaster risk of power system effectively,new assessment technique which takes comprehensive consideration of the whole procedure of lightning disaster risk is proposed.We build up lightning disaster risk assessment hierarchical structure model,which can be applied for comprehensive assessment according to the factors above.A whole-level power system lightning disaster risk assessment system,namely power network → lines → tower section → tower,is initiated based on the evaluation of tower section and tower.The assessment system is adopted in this paper for whole-level lightning disaster risk assessment of typical 500 kV power network,and it proves to be effective in determining lightning improvement priority and establishing lightning protection technology and strategy of power system.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第12期3012-3021,共10页
High Voltage Engineering
基金
国家电网公司科技项目(SG0881)~~
关键词
电网
雷害风险评估
雷击跳闸
雷击重合闸
供电可靠性
设备损害性
power network
lightning disaster risk assessment
lightning strike trip-out
lightning strike reclosing
power supply reliability
equipment damages
