2021年10月11日地磁暴对两座变电站GIC的影响

近年来中国相继监测到地磁暴侵害电网、铁路轨道电路和油气管道系统产生的地磁感应电流（Geomagnetically Induced Current，GIC）数据，但是目前实测的GIC数据还相对较少。根据2021年10月9日日冕物质抛射事件（CME）产生的Kp指数为6的地磁扰动（Geomagnetic Disturbance，GMD）数据，500 kV阿拉坦变电站（48.7°N，116.8°E）和上河变电站（33.4°N，119.2°E）及输电系统的参数，分析了2021年10月11日地磁暴期间在两座变电站监测到的GIC数据以及输电系统参数对GIC量值的影响。结果表明:地磁暴在500 kV上河变电站产生的GIC比阿拉坦变电站GIC量值相对较大。分析结果说明，在这次磁暴事件中，输电线路导线电阻是影响变电站GIC的主要因素。 

Influence Factors of GIC in Two Substations of Geomagnetic Storm on 11 October 2021

In recent years, China has successively monitored the Geomagnetically Induced Current (GIC) data generated by geomagnetic storms against the power grid, railway track circuit as well as the oil and gas pipeline system, However, the measured GIC data are relatively few at present. According to the Geomagnetic Disturbance (GMD) data of geomagnetic storm with Kp index of 6 generated by CME on 9 October 2021, the parameters of 500 kV Alatan substation (48.7°N, 116.8°E), Shanghe substation (33.4°N, 119.2°E) and transmission system, the GIC data monitored in two substations during the geomagnetic storm on 11 October 2021, and the influence of transmission system parameters on the GIC value are analyzed. Results show that the GIC value produced by geomagnetic storm in 500 kV Shanghe substation is relatively larger than that in Alatan substation. The analysis results show that the conductor resistance of transmission line is the main factor affecting the GIC of substation in this magnetic storm event.