大型水电站发变组联合单元接线主保护配置方案探讨

Study on Configuration Plan for Main Protection of United Generator-Transformer Unit Connection in Large-scaled Hydropower Stations

近年来大型水电站多采用联合单元接线的主接线方式。文章结合工程实例,主要对主变及主变高压侧引出线的保护配置方案进行了分析,并介绍主变高压侧电流互感器的选型问题,最终对联合单元接线的主保护配置方案提出了建议。

In recent years, the united generator-transformer unit connection is applied by most large-scaled hydropower stations. In this paper, in combination with engineering practice, the configuration plan for protection of main transformer and outgoing line at HV side of the main transformer is analyzed and type selection of CT at HV side of the main transformer is introduced as well. Finally, tips on con- figuration plan for main protection of united generator-transformer unit connection are raised.