摘要
对架空线路在感应雷和直击雷作用下的雷击跳闸率计算公式进行了推导,以某地实测数据经拟合的雷电流幅值概率函数为例进行计算。结果表明:在不采取任何防雷措施的情况下,100 km长的35 k V等级以下的架空配电线路年雷击跳闸率可能高达34.4次,严重影响电网的安全运行。计算结果与实际统计结果相吻合,验证了雷击跳闸率计算公式的正确性。分析了导致雷击跳闸的因素,提出了应对措施,即提高绝缘子冲击闪络电压、适当降低线路和杆塔高度、提升线路的耐雷水平以及降低工频建弧率等,以实现在不同程度上对架空配电线路进行防雷保护。
The calculation formula for lightning stroke outages rate of overhead line due to induced lightning and di-rect lightning was derived, and calculation was made with the example of lightning flow amplitude probability func-tion fitted for the measured data of some place. Results show that in the case of no lightning protection measures, the annual lightning stroke outages rate of 100km long overhead power distribution lines below 35kV level may be as many as 34. 4 times which seriously affects the safety of power grid operation. Since calculation results fit the actual statistical results, the correctness of calculation formula of lightning stroke outages rate is verified. At the same time, the factors of affecting the lightning stroke outages rate was analyzed. After that, the paper takes the fellow measures which is to improve the impulse flash over voltage of insulator, reduce the line and tower height appropri-ately, improve line lightning withstand level, reduce working frequency arc establishing rate and so forth. There-fore ,the purpose is achieved by carrying out lightning protection measures of overhead power distribution line to a certain extent.
出处
《黑龙江电力》
CAS
2016年第6期501-504,509,共5页
Heilongjiang Electric Power
关键词
架空配电线路
雷击跳闸率
感应雷
直击雷
防雷措施
overhead power distribution line
lightning stroke outages rate
induced lightning
direct lightning
lightning protection measures
