电力负荷管理终端防电流法窃电装置研制  

Theftproof device for power load management terminal

作　　者：张伊辉 马延峰 韩平军 赵明渊 

机构地区：[1]凯迈(洛阳)电子有限公司,河南洛阳471003

出　　处：《电力自动化设备》2009年第11期132-135,共4页Electric Power Automation Equipment

摘　　要：负载电流经电流互感器(TA)接入电力负荷管理终端内部的交流采样装置,若存在电流法窃电行为,TA二次回路的阻抗会发生变化。在终端内部电流计量回路设计了信号变送器ST(Signal Transformer),以实现强弱信号的隔离,并实时监测TA二次回路的阻抗变化;结合ST的阻抗匹配电路,详细地分析了TA一次/二次侧不同的窃电手段对ST输入阻抗的影响;利用高频信号对阻抗变化敏感的特性,向ST注入特定频率的高频振荡信号,并由微处理器AT91SAM7S256对流经ST的高频信号进行数据采集和处理;窃电手段不同,微处理器采集的高频信号均方幅值也不同。试验表明,该防窃电装置可快速、准确地识别发生在TA一次/二次侧的窃电行为及具体的窃电方式。As the load is connected to PLMT（Power Load Management Terminal） through CT（Current Transformer）,the impedance of CT secondary circuit will change if there is electricity-theft. The ST（Signal Transformer） is designed in the current measuring circuit of PLMT to realize signal isolation and monitor the impedance change of CT secondary circuit in real-time. Combined with the impedance matching circuit of ST, the effect of electricity-theft at CT primary or secondary side on ST input impedance is analyzed. Being sensitive to impedance change,specific high-frequency signals are injected into ST,which are sampled and processed by microprocessor AT91SAM7S256. The mean square amplitude of sampled high-frequency signals differs according to different electricity-theft means. The experiment shows that,the theftproof device can find and identify the electricity-theft quickly and accurately.

关 键 词：电力负荷管理终端 交流采样 防窃电 信号变送器 电流互感器 

分 类 号：TM764.1[电气工程—电力系统及自动化]