采用数字技术的小电流接地选线和故障定位装置  

Grounding fault identification device based on the digital technology

作　　者：陶利国 许云峰 

机构地区：[1]湖南省永州电力勘测设计院,湖南永州425000 [2]北京市天利自动化设备研究所,北京100083

出　　处：《电力系统保护与控制》2010年第7期86-90,共5页Power System Protection and Control

摘　　要：小电流接地选线装置准确性差一直是困扰厂家和用户的难题。介绍了一种基于外加信号法的新型小电流接地选线装置,该装置针对目前模拟装置在信号源及选频方面存在的缺点,综合当前先进的电子技术和计算机技术,采用了数字信号源技术、数字选频技术等关键技术,从根本上解决了模拟电路由于温度漂移,元器件老化所产的频率不准,频率不稳定的缺陷。现场运行结果证明该装置是小电流接地选线的理想设备。How to improve the accuracy of the proper judgment is a difficult problem to the manufacturer and users. In this paper, a new kind of the fault line selection device based on the signal injection is introduced. Combining with the advanced electronic and computer technology, this device aims at the disadvantage of existing analog device including signal generating and frequency selection. The key is digital signal producing and the digital frequency selection technology. It is a better resolution to overcome the frequency inaccuracy and low stabilization due to the temperature drift and the component ageing. Facts proved that this device is ideal for selecting the fault line from the system.

关 键 词：小电流接地选线 故障定位 外加信号法 数字信号源 数字选频 

分 类 号：TM862[电气工程—高电压与绝缘技术]