摘要
由于目前输电线路与管道常交叉、并行架设,当雷击杆塔时雷电流会沿杆塔两侧避雷线流向相邻多基杆塔,而杆塔接地散流不可避免会对临近管道产生过电压影响。针对多基杆塔接地散流下管道过电压进行仿真计算并提出管道过电压防护方法。首先利用电磁暂态软件ATP-EMTP搭建输电线路雷电暂态计算模型,计算不同土壤电阻率下多基杆塔雷电流分布特征;然后基于多基杆塔雷电流分布特征,搭建多基杆塔接地网-油气管道散流计算模型,计算分析土壤电阻率、“管-线”间距及雷电流幅值等因素对管道过电压的影响;最后对比分析“接地排流线”、“迫向换流”等方式对管道过电压的防护效果。研究结果表明:土壤电阻率增加使杆塔接地电阻变大,从而使得杆塔分流系数会逐渐减小;相较单基杆塔模型,考虑多基杆塔接地散流会加剧管道过电压问题,土壤电阻率和雷电流幅值增加将导致管道过电压升高,“管-线”间距增加会导致管道过电压降低;敷设排流线和采用迫向换流等方式均可有效降低管道电位。
Due to the present transmission lines and pipelines are often crossed and installed in parallel,the lightning current will flow to the adjacent multi-base towers along the lightning lines on both sides of the tower when the tower is struck by lightning,and the dispersion will inevitably have an over-voltage impact on the adjacent pipelines.The simulation calculation of pipeline overvoltage under multi-base tower grounding current distribution is carried out and the pipeline overvoltage protection method is proposed.Firstly,the electromagnetic transient software ATP-EMTP is used to set up the lightning transient calculation model of transmission lines,and the lightning current distribution characteristics of multi-base towers under different soil resistivity are calculated;then,based on the lightning current distribution characteristics of multi-tower,the calculation model of multi-tower grounding grid-oil and gas pipeline dispersion is established to calculate and analyze the influence of soil resistivity,'tube-line'spacing and lightning current amplitude on pipeline overvoltage;finally compare and analyze the effects of"grounding bar","forced commutation"and other methods'protection effect of pipeline overvoltage.The results show that the grounding resistance of tower increases with the increase of soil resistivity,and the shunt coefficient of tower decreases gradually;compared with the single-base tower model,considering the multi-base tower grounding current will aggravate the pipeline overvoltage problem,soil resistivity and lightning will lead to an increase in the pipeline overvoltage,and an increase in the"pipe-line"spacing will cause a decrease in the pipeline overvoltage;methods such as laying drain lines and using forced commutation can effectively reduce the pipeline potential.
作者
王靖
姜志鹏
袁驰
安韵竹
陈芳林
尹宓
WANG Jing;JIANG Zhipeng;YUAN Chi;AN Yunzhu;CHEN Fanglin;YIN Mi(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Hubei Power Supply Limited Company Ezhou Power Supply Company,Ezhou 436000,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第4期9-17,共9页
Insulators and Surge Arresters
基金
国家自然科学基金项目(编号:51807113)
关键词
输电线路
油气管道
多基杆塔接地散流
管道过电压
transmission line
oil and gas pipeline
multi-base pole tower grounding dispersion current
pipeline overvoltage
