【摘要】 指出变压器差动保护装置容易误动和拒动的几个原因,并结合电气量的物理特征分析法、各侧电气量综合分析法和图形分析法,对变压器差动保护中采样异常、电流互感器饱和等关键问题进行深入分析,提出了解决的办法,同时从理论上证明了区内故障时差动电流和零序电流之间存在一定关系,利用这种关系可以可靠防止变压器差动误动。更多还原

【Abstract】 This paper analyzes the causes of mal-operation in transformer differential protection. By referring to the analysis of the physical characteristics of electric quantities, the integrated analytical method for electric quantities on all sides and graphics analytical method, key problems about sampling abnormality and current transformer saturation are thoroughly analyzed and measures are presented. The definite relationship between the differential current and zero sequence current during internal fault is proved in theory, by which the mal-operation of transformer differential protection can be reliably prevented.更多还原