一种适用于多分支线路-变压器组的纵联差动保护研究  

Research on a Longitudinal Differential Protection for Line-transformer Unit with Multiple Branches

作　　者：张灏[1,2] 陈实[1,2] 

机构地区：[1]国电南京自动化股份有限公司,江苏南京211100 [2]南京国电南自电网自动化有限公司,江苏南京211100

出　　处：《供用电》2016年第7期44-48,共5页Distribution & Utilization

摘　　要：针对三绕组变压器以及带多分支情况的线路-变压器组光纤电流差动保护,分析了传统方法中采用和电流方式存在的可靠性不足问题,以及分别传输各侧电流存在的通道带宽不足问题,提出了一种仅在光纤通道中传输一组相量电流和一组标量电流的线路-变压器组差动保护方法。通过仿真计算将所述新方案与和电流方式进行了对比,验证了该方案的可行性。In this paper, for differential protection of a line-transformer unit with three winding transformer or even with multiple branches, the low reliability problem of the traditional method of current summing mode, and the low bandwidth problem of transforming all currents of the transformer respectively are analyzed. A new method of line-transformer-unit optical-fiber current differential protection that only need to transform one vector current and one scalar current is proposed. The feasibility of the new method is verified through comparing with the sum current method based on simulation.

关 键 词：线路-变压器组 继电保护 差动保护 多分支 

分 类 号：TM41[电气工程—电器]