摘要
为了分析比较当前工程上常用的几种具有代表性的输电线路避雷线屏蔽性能分析计算模型的特点,介绍了Whitehead’s EGM、Eriksson的改进电气几何模型、Rizk的先导传播模型的计算过程,并运用上述3种方法及我国现行的规程法对某220 kV输电线路在分别处于平原及斜山坡区域的条件下进行了计算,比较了各模型及我国现行规程所提供的经验公式法所得结果的差异。分析模型表明,绕击跳闸率随保护角的增大而增长速度越来越快,Rizk模型对绕击跳闸率的评估最佳,Eriksson模型对高度变化的敏感度最高且其结果最差,Wagner关于斜山坡外(内)侧的绕击率可由保护角加(减)坡角换算成平地线路计算结果对Whitehead模型近似成立,对Eriksson模型有夸大跳闸率的趋势。
In order to analyze several current representative calculation models for analyzing the performance of lightning conductor shielding of power transmission line in projects, this paper briefly introduces the whitehead＇s electrogeometric model, the Eriksson＇s Improved electrogeometric model and the Rizk＇s leader propagation model. On the Basis of above-mentioned three kinds of methods and the model of current regulations law in China, the flashover rate of shielding failure of transmission line which lies in the condition of plain area and oblique hillside is calculated, respectively. The flashover rate of shielding failure with different heights of lightning conductor is calculated by a- bove-mentioned methods. All the calculations are implemented by means of the programs that hre compiled with MATLAB6.5. The differences in results of each calculating-model are compared. The calculation results indicate that the result of Eriksson＇s model shows the highest flashover rate, and the second is the result of Whitehead＇s model and the result of the model of current regulations law, two of which are coincident with each other, and the last one is the result of Rizks, along with the increase of protection angle the flashover rate of shielding failure is increasing faster and faster. The Rizk＇s model is the most optimistic to assess the flashover rate of shielding failure; the Erlksson＇s model is the most sensitive to the height change of the lighming conductor, and its result is the most severe and pessimistic; the Wagner＇ s theory shows that the rate of shielding failure of transmission line which lies on brae can be transformed to what lies in plain area through adding{outside） or subtracting（inside） the protection angle, coinciding with the whitehead＇s electrogeometric model approximately, but the Eriksson＇s model exaggerates the results.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第11期119-122,共4页
High Voltage Engineering
关键词
输电线路
避雷线
雷电屏蔽
绕击
保护角
模型
transmission line
lightning conductor
lightning shielding
shielding failure
protection angle
model
