基于法拉第磁光效应的干式空心电抗器在线电流监测系统

Online Current Monitoring System of Dry-Type Air-Core Reactor Based on Faraday Magneto-Optic Effect

针对干式空心电抗器匝间短路故障无法快速识别而导致的发生冒烟、明火等事故问题,采用理论、仿真与试验相结合的方法,研究基于法拉第磁光效应的干式空心电抗器在线电流监测系统方案。试验结果表明:首先,数据传输采用光信号,可有效避免空心电抗器高强磁场对信号传输的影响;其次,通过监测汇流排电流可在3个周波(0.06 s)内检测确定匝间故障,避免事故扩大;最后,通过数据分析后处理,可以定位干式空心电抗器故障包封层。研究成果表明该系统可有效提高输变电设备状态在线监测水平,为干式空心电抗器匝间故障监测提供了行之有效的技术手段。

Aiming at the accident of open flames and smoke caused by turn-to-turn short-circuit fault of dry-type air-core reactor which can t be identified quickly,by combining theory,simulation and test,this paper studies the scheme of online current monitoring system of dry-type air-core reactor based on Faraday magneto-optic effect.Results of verifiation test indicates three points.Firstly,optical signal is used in data transmission,which can effectively avoid the influence of strong magnetic field generated by air-core reactor on signal transmission.Secondly,the monitoring system could determine the turn-to-turn insulation fault within three cycles(0.06 s)by monitoring the current in spider arm and avoid the further expansion of accidents.Thirdly,the fault position of dry-type air core reactor can be located through data analysis and post-processing.The research results show that this monitoring system could effectively improve the online monitoring level of power transmission and transformation equipment status and provide an effective technical means for turn-to-turn insulation fault monitoring of dry-type air-core reactor.