摘要
变电站直流系统发生交流串扰故障后,会造成继电器误动作,危害系统正常运行。首先介绍了继电器动作特性及其工作原理;其次建立了直流系统等效模型,并根据故障发生位置推导出直流系统交流串扰故障解析方程,分析了发生交流串扰故障时系统中各参数变化对继电器两端电压的影响;然后在Multisim中建立交流串扰故障仿真模型,通过仿真验证了理论分析的正确性;最后提出减小电缆对地分布电容、提高继电器动作功率和避免外界因素造成交流串扰故障的措施。
After the AC crosstalk fault occurs in the DC system of the substation,it will cause the relay to malfunction and endanger the normal operation of the system.In this paper,the action characteristics and working principle of the relay are firstly introduced;secondly,the equivalent model of the DC system is established,and according to the fault location,the analytical equation of the AC crosstalk fault of the DC system is deduced,and the change of each parameter in the system when the AC crosstalk fault occurs is analyzed.The influence of the voltage at both ends of the relay;then the simulation model of AC crosstalk fault is established in Multisim,and the correctness of the theoretical analysis is verified by simulation;finally,it is proposed to reduce the distributed capacitance of the cable to the ground,improve the operating power of the relay,and avoid the AC crosstalk fault caused by external factors measures.
作者
李书瀚
王岩
高扬
乔建
LI Shuhan;WANG Yan;GAO Yang;QIAO Jian(School of Electrical Engineering,Northeast Electric Power University,Jilin 132000,China;State Grid Jilin Eletric Power Company Jilin Power Supply Company,Jilin 132000,China)
出处
《电气应用》
2022年第8期38-44,共7页
Electrotechnical Application
基金
吉林省科技厅科技计划重点研发项目(20180201010GX)。
