摘要
针对电力系统的防雷保护着重于降低闪络率、仅通过电压等级进行区分、不考虑输电线路之间的功能差异、缺乏对电网可靠性影响的分析,从而导致一般输电线路的防雷设计过剩但对关键线路不足的问题,提出了基于电网可靠性的输电线路雷击评估方法。首先利用全波过程理论分析雷电绕击,采用先导发展模型描述传输线屏蔽失效的过程,提出了电网可靠性指标,并详细讨论了输电线路故障对电力系统可靠性的影响。通过指标系统计算了某市夏季雷击时电网可靠性,计算与分析结果表明,500 kV线路屏蔽故障跳闸率远高于绕击跳闸率,220 kV输电线路屏蔽故障跳闸率类似于绕击跳闸率,而110 kV输电线路绕击跳闸率则相对较高。
The lightning protection of power system focuses on the reducing flashover rate,distinguishing only by voltage level,ignoring the functional differences between transmission lines,and lack of analysis of the impact on the reliability of power grid,resulting in excessive lightning protection design of general transmission lines but insufficient critical lines. The author proposes a lightning stroke assessment method for transmission lines based on power grid reliability. Firstly,the theory of full wave process is used to analyze lightning shielding failure,and the process of shielding failure of transmission line is described by a pilot development model. The reliability index of power grid is proposed,and the influence of transmission line fault on the reliability of power system is discussed in detail. Finally,through these indicators,the reliability of a city’s power grid during lightning stroke in summer is calculated. It is concluded that the shielding failure tripping rate of 500 kV transmission line is much higher than that of shielding failure.The shielding failure tripping rate of 220 kV transmission line is similar to that of shielding failure,while that of 110 kV transmission line is relatively high.
作者
冯婷婷
张竣淇
陈永刚
FENG Tingting;ZHANG Junqi;CHEN Yonggang(Economic and Technological Research Institute,State Grid Chongqing Electric Power Company,Chongqing 401120,China)
出处
《电瓷避雷器》
CAS
北大核心
2021年第1期160-164,共5页
Insulators and Surge Arresters
关键词
电网
可靠性
雷击
先导发展模型
全波过程理论
屏蔽失效
输电线路故障
power grid
reliability
lightning strike
pilot development model
full wave process theory
shielding failure
transmission line failure
