摘要
磁暴在输电线路引发的地磁感应电流(GIC)频率为0.001～0.100 Hz,这种准直流的GIC将造成变压器直流偏磁饱和,引发电网保护误动作和停电事故。为了分析、研究GIC对西北750 kV电网的影响,开发研制了电网GIC监测装置。装置在官亭、兰州东750 kV变电站的应用表明,研制的装置能有效地测量电网准直流、随机性信号,并且具有数据处理量少、节约存储空间等优点。
Geo-magnetically induced currents(GIC) are triggered by geomagnetic storms,the frequency of which ranges from 0.001 Hz to 0.100 Hz.GIC will cause DC bias saturation of transformers,unnecessary relay tripping and blackouts.To analyze and study effects of GIC on Northwest 750 kV power grid,GIC monitoring device is developed for power grids.The application of devices in Guanting and Eastern Lanzhou 750 kV substations indicated that the devices can effectively measure random quasi-dc signals in power grids,and have advantages such as less data processing volume and memory space.
出处
《电网与清洁能源》
2008年第12期38-41,共4页
Power System and Clean Energy
基金
国家自然科学基金项目(50677020)
国家"863计划"项目(2007AA04Z425)
西北电网有限公司<地磁感应电流对750kV变压器及保护影响的研究>科技项目
关键词
磁暴
GIC监测
霍尔传感器
直流偏磁
软硬件设计
geomagnetic storm
GIC monitoring
Hall sensor
DC bias
design of hardware & software
