摘要
变电站接地系统是确保电气设备及人身安全的重要设施,控制电缆连接一次设备与二次设备,其安全性能影响着二次系统的稳定运行。基于不等电位的节点电压法,研究了带有双端接地电缆的地网参数计算模型,并通过matlab编写程序对电缆芯线-屏蔽层电位差进行仿真分析。研究结果表明:芯线-屏蔽层电位差受土壤电阻率影响较小,受电缆长度与地电位升影响较大;在电缆沟中并联铺设铜接地带能有效保护电缆及电气设备安全;综合二次系统绝缘耐受电压与电缆接地方式,可将地电位升提高到5 kV甚至更高。
The substation grounding system is the important facilities to ensure the safety of power equipments and human beings. The control cable is the connection between the primary device and the secondary device,and its safety performance affects the stability of the secondary system. A grounding parameters calculation model with two-end grounded cables is built based on unequal potential nodal analytical method,and using matlab programming,the potential difference between the core and sheath of secondary cable is simulated. It is obtained that the potential difference of the core and sheath is less affected by the soil resistivity,which is greatly affected by the cable length and the ground potential rise. Laying copper row in the cable trench can effectively protect the safety of cables and equipments. Comprehensive the insulation voltage of secondary system and the grounding methods of the cable shielding line,the ground potential rise can be increased to 5 kV or even higher.
作者
史柳
刘骐
胡全义
鲁志伟
SHI Liu;LIU Qi;HU Quanyi;LU Zhiwei(State Grid Jilin Maintenance Company,Changchun 130000,China;Electrical Engineering College, Northeast Electric Power University,Jilin 132012,China;Electric Power Research Institute, Eastern Inner Mongolia Electric Power Company of State Grid,Huhehaote 010020,China)
出处
《电瓷避雷器》
CAS
北大核心
2018年第6期117-121,共5页
Insulators and Surge Arresters
关键词
接地系统
电缆
芯线-屏蔽层电位差
地电位升
grounding system
cable
potential difference between core and sheath
ground potential rise
