摘要
近年来雷击造成的线路跳闸逐渐增多,因此绝缘子绝缘性能是保障输电线路平稳运行的关键之一。为了研究绝缘子在雷电流下的冲击响应,笔者运用电磁暂态软件CDEGS建立了500 k V同塔双回输电线路雷击冲击响应模型,计算不同雷电流波形参数及不同杆塔参数下绝缘子两端电压差值峰值,并分析其随参数变化的雷电冲击响应规律。计算结果表明,幅值为10 kA的标准指数雷电流流过杆塔塔顶时,绝缘子两端电压差峰值为142 k V;在一定范围内,随着波前时间加长,横担长度变长,杆塔高度减小,土壤电阻率越高,绝缘子两端冲击电压差峰值越小,越不容易被击穿;土壤电阻率越高,避雷线电流峰值越大,避雷线的分流作用越明显。
The isolation performance of insulators is one of the key point to keeping the stable operation of the circuit. However,the transmission line tripping caused by lightning strike is increasing in recent years. In order to research the impulse response of the insulators under the lighting current,a lighting impulse model of 500 kV double-circuit transmission line with the same-tower is established by using the software CDEGS. The peak voltage between the insulator is calculated under different parameters of lighting current waveform and tower,and lighting impulse response is analyzed for different parameters.The results show that: when standard exponential lighting current of 10 k A flows through the tower top,the peak voltage difference between the insulator is 142 kV. The lower impulse peak voltage difference of insulators is resulted from longer wave front time of lightning more,longer length of cross arm,shorter height of tower more and greater soil resistance in some distance domain,the insulator is less likely to be broken down. With the soil resistance increasing,the peak current of lighting conductor will be increased and the diversion effect of lighting conductor will be better.
作者
荆林国
荆仲毅
张韶晶
张韶颖
JING Linguo;JING Zhongyi;ZHANG Shaojing;ZHANG Shaoying(State Grid Binzhou Electric Power Company,Binzhou 256610,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第6期198-203,共6页
Insulators and Surge Arresters
关键词
输电杆塔
雷电流波形参数
绝缘子
冲击响应
transmission tower
lightning current waveform parameter
insulator
impulse response
