基于光电互感器的数字式母线保护  

Digital bus protection based on optical current transducer

作　　者：唐治国[1] 许国斌[2] 张发金[1] 

机构地区：[1]国电南京自动化股份有限公司,江苏南京211100 [2]定西供电公司,甘肃定西743000

出　　处：《电力自动化设备》2007年第5期118-121,共4页Electric Power Automation Equipment

摘　　要：基于传统电流互感器的微机母线保护在母线发生区外故障时,常因对电流互感器饱和处理不周而引起保护不正确动作。为彻底解决电流互感器饱和对母线保护影响,开发了基于数字式光电互感器的数字式母线保护装置。对目前主流的光电互感器OET700进行充分研究后,从软硬件方面给出相应解决方案。硬件方面采用多CPU系统,将数据采集、保护逻辑、人机交互的功能分别由单独CPU处理,有效解决母差保护的资源问题。针对光电互感器无饱和、有谐波、有坏数、有削波等特点,软件方面采用比率制动、傅氏差动、坏点监测等机制,给出了相应解决方案。实际运行证明,该母差保护完全满足电力系统数字式变电站的要求。When external fault occurs,the microprocessor bus protection with traditional CT （Current Transformer） may operate incorrectly because of CT saturation. To avoid its influence on bus protection,the bus protection device with digital optical current transducer is developed. Solution for optical current transducer OET700 is proposed. In hardware,multi- CPU system is adopted to effectively solve the resource problem of bus differential protection,in which different functions are implemented in different CPUs,such as data acquisition,protection logic,man- machine interaction and so on. In software,ratio restraint mechanism,Fourier differential and bad data monitoring are applied for processing the harmonics,bad data and clipping of optical current transducer. The practice proves that,the designed bus protection meets requirements of digital substation.

关 键 词：母线保护 数字式光电互感器 差动保护 

分 类 号：TM773[电气工程—电力系统及自动化]