摘要
随着电力系统短路容量的增加,经常出现主设备的容量远小于系统短路容量的情况,其保护用电流互感器的参数选择成为困扰继电保护工作者的突出问题。若电流互感器按照主设备额定容量来选择,则会造成内部出口故障时电流互感器严重饱和,需要对此时的保护性能进行详细分析。文中通过实验和理论分析的方法研究了内部故障电流互感器深度饱和时的继电保护性能,根据实验结果从电流互感器参数、二次回路情况和继电保护装置性能等多个角度,详细分析了影响继电保护动作行为的种种因素。提出了为确保继电保护可靠动作,保护装置对电流互感器的基本要求,只要满足这些基本要求,则可按照主设备容量来选择保护用电流互感器。
With the increasing of power system capacity,the capacity of single main equipment is often much less than that of whole system. The parameter selection of protective current transformer （CT） becomes difficult faced by relay protection engineer. If CT is selected according to rated capacity of main equipments,CT may saturate deeply when serious internal fault happens. In this case the performance of relay protection should be studied carefully. The performance of relay protection has been studied with methods of experiment and theoretic analysis when internal fault causes CT deeply saturated. According to the experimental results,various factors influencing the relay protection actions have been analyzed,from the aspects of CT parameters,the secondary circuit and the relay protection. To ensure reliable relay protection,CT must meet the basic requirements. As long as these basic requirements satisfied,it is feasible to choose current transformer according to the main equipment capacity.
出处
《电力系统自动化》
EI
CSCD
北大核心
2010年第19期100-104,共5页
Automation of Electric Power Systems
关键词
电流互感器
准确限值电流
饱和
微机保护
current transformer（CT）
accurate limited current
saturation
microcomputer-based protection
