长电缆对地分布电容对控制回路的影响分析及解决方案  

Analysis and Solution of the Influence of Distributed Ground Capacitance of Long Cable on Control Loop

作　　者：林祥辉 王皓 邵安海 LIN Xianghui;WANG Hao;SHAO Anhai(State Grid Fujian Ultra High Voltage Company,Fuzhou 350011,China)

机构地区：[1]国网福建超高压公司,福州350011

出　　处：《电线电缆》2023年第5期42-46,共5页Wire & Cable

摘　　要：长电缆敷设会导致对地电容增大,改变二次回路的电路参数,干扰二次控制回路,进而影响电气设备正常运行。本工作分析了常规直流站内长电缆对地分布电容对刀闸电气闭锁回路的影响,理论计算该回路对地分布电容和允许的最长电缆长度,并就长电缆对地分布电容对电气闭锁回路的影响提出相应的改进措施,提高了站内防误闭锁逻辑运行的可靠性,保证了电网安全稳定运行。Long cable laying will lead to the increase of ground capacitance,cause great interference to the secondary control loop,and then affect the normal operation of electrical equipment.The influence of ground capacitance of long cable on the secondary electrical locking loop was analyzed.Ground circuit capacitance and the maximum allowable cable length were calculated theoretically.Besides,corresponding improvement measures were put forward for the influence of distributed ground capacitance of long cable on the secondary control locking loop,which improved the reliability of logic operation of anti-error locking in the station and provided a reliable guarantee for safe and stable operation of the power grid.

关 键 词：长电缆 对地分布电容 电气闭锁 电网安全 

分 类 号：TM28[一般工业技术—材料科学与工程]