数字式变压器差动保护误动分析

Analysis of misoperation of digital differential protection for transformer

结合对一起主变差动保护误动原因的分析,介绍了CST31A型数字式变压器差动保护电流相位校正和幅值平衡补偿的基本原理,对误动原因进行了定性分析和定量计算,从技术和管理方面提出了防范措施。

The paper, by analyzing the reasons for once misoperation of digital differential protection for transformer, introduces the basic principle of current phase correction and amplitude balance compensation of CST31A digital differential protection for transformer, qualitatively analyzes and quantitatively computes the reasons for misoperation, puts forward countermeasures from technical and managemental point of view. 