在特高压换流站中，500 kV交流站用变压器采用气体绝缘金属封闭输电线路(gas insulated metal enclosed transmission line, GIL)连接方案可以节省投资、优化交流场布置、提高连接的可靠性、减少维护工作量。提出了应用有源电子式互感器来解决气体绝缘开关设备（gas insulated switchgear, GIS）价格偏高的问题，力求在保证可靠性的前提下降低工程造价，解决特高压换流站站用变压器高压侧小变比电流互感器的饱和问题，为特高压换流站GIS设备应用电子式互感器进行了有益的尝试。

The connection scheme of gas insulated metal enclosed transmission line (GIL) can save investments of bushing and GIL pipeline, optimize arrangement of AC yard, improve the reliability of connection and reduce the workload of maintenance, for the station-service transformer in UHV converter stations. An active electronic transformer was used to solve the problem that the price of gas-insulated switchgear (GIS) was a little high. This method can reduce the construction cost on the premise of reliability, and effectively solve the saturation problem of small ratio current transformer at high voltage side for the station-service Transformer in UHV converter stations, which can promote the application of GIS electronic transformer in UHV converter stations.