基于Allan方差理论的光纤电流互感器运行状态诊断  

Operation Status Diagnosis of Fiber Optic Current Transducer Based on Allan Variance Theory

作　　者：周刚 张代新[2] 谢善益 常夏勤[2] 杨强 

机构地区：[1]广东省电力公司电力科学研究院,广州510600 [2]南京南瑞继保电气有限公司,南京211106

出　　处：《高压电器》2017年第10期204-208,共5页High Voltage Apparatus

摘　　要：光纤电流互感器(FOCT)克服了传统电磁式电流互感器在暂态响应、绝缘等方面的弱点,满足现代电力工业对电流值实时精确测量的需求。为了确保电流互感器在准确测量电流参量的同时,具有低故障、高可靠性的特点,急需开展光纤电流互感器状态诊断技术研究。通过分析光纤电流互感器测量数据的时域及频域特征,建立关键部件物理特性与互感器数据特征之间的对应关系,构建基于Allan方差的光纤电流互感器状态诊断分析模型,根据Allan方差计算结果诊断互感器状态,并实现自身故障定位。仿真结果表明:基于Allan方差的状态诊断方法准确有效,可在无附加硬件设备、互感器不停电的条件下,实现光纤电流互感器的在线监测和状态诊断。Fiber optic current transducer （FOCT） overcomes the weakness of electromagnetic current transducer in transient response, insulation and other performances, and meets the demands of accurate current measurement real-timely in modern power system To ensure low failure and high reliability of fiber optic current transducers（FOCT）, it is urgent to study methods of condition monitoring and fault diagnosis in FOCT. Faults in FOCT have statistical characteristics. With analyzing of time domain and frequency domain features in fiber optic current transformers＇ measurement data, we establish correspondence between the physical characteristics of key components in transformer and data features, then, build diagnostic analysis model based on Allan variance. According to the Allan variance calculation results, we can diagnose fiber optic current transformer＇s health state, and realize faults location. Experiment results show that diagnostic methods based on Allan variance are accurate and effective to identify fault features, diagnostic operation status, and online monitor, without additional hardware equipment and power off., transformers no power outages, no off-grid conditions, the realization of electronic transformer online monitoring and condition diagnosis.

关 键 词：光纤电流互感器 随机噪声 状态诊断 Alldan方差 

分 类 号：TM452[电气工程—电器]