中文摘要：

磁暴在输电线路产生的地磁感应电流（GIC）变化频率为0．0001Hz～0．01Hz，并且具有随机性、持续时间为几分钟到几小时等特征。针对国内电网发现的GIC问题，提出了建立电网GIC监测网络系统的设想，给出了电网GIC信号的提取方法及数字信号处理算法，并研制了监测电网GIC的新型装置。试验和实际应用表明，所研制的装置能有效测量GIC这种准直流、随机性的信号，并具有数据处理量少、节约存储空间等优点。

英文摘要：

Strong magnetic storms can lead to the geomagnetically induced current （GIC） in power transmission lines with a frequency range from 0. 000 1 Hz to 0.01 Hz. GIC is characterized by happening at random and usually lasting from several minutes to several hours. Based on an analysis of the characteristics and influence of GIC in China＇ s power grids, the proposal for building a GIC monitoring network system for the power grid is made. The method of extracting the grid GIC signal and the digital signal processing algorithm are given. The monitoring device has been developed. Tests and actual application show that the monitoring device can accurately measure the quasi-direct current and stochastic signal GIC, with few data to process and memory space to save .