电流互感器二次回路故障智能检测方法研究与设计实现  

Design and implementation of intelligent detection method for secondary side circuit fault of current transformer

作　　者：肖勇[1] 周尚礼[1] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080

出　　处：《电力系统保护与控制》2010年第12期115-120,共6页Power System Protection and Control

摘　　要：介绍了一种应用于负荷管理终端中对配网电流互感器(CT)二次开短路故障智能在线检测的技术原理和方法——导纳法,通过检测电流互感器二次侧回路阻抗特性诊断其工作状态。详细阐述了负荷管理终端检测电流互感器故障的电子电路设计,包括信号变换电路、信号放大电路、低通电路、带通滤波电路和交直流转换电路等。实际试验和应用实践表明,该设计方法可准确、有效地检测各种变流比互感器不同程度的开短路异常故障,解决了长期以来实时在线准确监测这一个难题。Admittance method and principles of intelligent detection technology for open-short fault at secondary side of current transformer（CT） in distribution network are introduced in this paper,which is applied in load management terminals.Through detecting impedance characteristics of circuit at secondary side,the working state of CT can be judged.Furthermore electronic circuits design for secondary side circuit fault of CT is presented,which is applied in load management terminals,including signal transformation circuit,signal amplifier circuit,low-pass circuit,bandpass filter circuit and AC to DC conversion circuit,etc.The practical test and application indicate that,when measuring different variable current detection current transformer at work unusual open-short failure of different degree,the method is reliable and effective to make electric power measurement accurate,so that real-time detection and on-line monitoring correctly would be solved,which has always been a difficult issue.

关 键 词：电流互感器(CT) 二次侧 负荷管理终端 导纳法 计量自动化 电路设计 

分 类 号：TM452[电气工程—电器]