中文摘要：

为了分析超高压电网合环操作时冲击电流的影响作用,结合新疆750 kV巴州变电站750 kV/220 kV电网合环操作实例,简化电网建模并建立冲击电流模型,分析了影响冲击电流的主要因素（电压差、相角差和总阻抗）及对应关系,进而制定合环操作方案并顺利实现电网合环.结果表明,实测冲击电流特性与理论分析结论一致,对电网合环操作实践具有重要的理论指导和经验借鉴作用.

英文摘要：

It is especially important to study the impact of surge current on electromagnetic closed-loop operation in the EHV power grid. Based on the 750 kV/220 kV closed-loop operation practice of the Xinjiang Bazhou 750 kV substation, a simplified model of surge current is established. The main factors that impact the surge current are analyzed, including voltage difference, phase angle difference and total impedance, and their relations with the surge current are studied. Furthermore, the scheme of closed-loop operation is formulated according to the grid structure of local power system so as to realize the operation. The measured characteristics of surge current are consistent with the theoretical conclusions, which can provide guidance for other grid closed-loop operations.