摘要
我国某长输管道所属站场曾发生雷击造成站内设备损坏事件,给站内安全生产造成严重影响,而接地装置是泄放雷击电流的重要设施,接地装置连接状态不良将影响其冲击接地阻抗。首先测量了阀室不同位置的冲击阻抗和工频接地电阻,对二者的关系进行了对比分析,研究发现:阀室各测点的实际冲击阻抗远大于工频接地电阻,不能用工频接地电阻乘冲击系数评估其冲击阻抗。利用冲击阻抗时变曲线不仅可以去判断接地网整体是否连接良好,还可以去分析不同测点之间是经过拓扑分支相连还是直接相连的;发现A阀室接地网整体接地良好,B阀室接地网存在个别接地不良,如测点1及测点4。该方法不仅可用于测量阀室的冲击阻抗,还可以用于检测各测点连通性。
In the station of a long pipeline in China,lightning usually caused equipment damage in the station which affected the safety production in the station.Grounding is important to release the lightning current.The bad connection state of the grounding device will affect its impulse impedance.The impulse impedance and ground resistance at different positions of the valve chamber are measured firstly,and the relationship between them is compared.It is found that the real impulse impedance at each measuring point of the valve hall is much larger than the ground resistance,so the impact impedance can not be evaluated by ground resistance multiplied by the impact coefficient.The time-varying curve of impact impedance can not only judge whether the whole grounding grid is well connected,but also analyze whether different measuring points are connected through topological branches or directly.It is found that the grounding grid of valve chamber A has good overall grounding,while the grounding grid of valve chamber B has some poor grounding,such as measuring point 1 and measuring point 4.The method presented in this paper can not only be used to measure the impact impedance of valve hall,but also can be used to detect the connectivity of each measuring point.
作者
刘勇
宋磊
刘继银
郑海波
吴明畅
曹晓斌
LIU Yong;SONG Lei;LIU Jiyin;ZHEN Haibo;WU Mingchang;CAO Xiaobin(Pipe China West East Gas Pipeline Company,Shanghai 200122,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第3期99-105,共7页
Insulators and Surge Arresters
基金
四川省科技计划项目(编号:2021YJ0311)。
关键词
长输管道阀室
接地网
冲击阻抗
工频接地电阻
pipeline valve chamber
grounding grid
impact impedance
power frequency ground resistance
