750kV单相自耦变压器零序差动保护分析

The analysis of zero phase sequence differential protection for 750kV single-phase autotransformer

针对国内首台容量最大的单相自耦变压器保护配置,分析了自耦变压器单相接地时零序电流的分布及750kV自耦变压器零序差动保护的不平衡电流来源,介绍了具有比率制动特性零序差动保护及零序差动保护的优点。

Aiming at the protection configuration of domestic, the first and the largest capacity single-phase autotransformer, analyzes the distribution of the zero sequence current when the autotransformer single-phase earthing, and the unbalanced current source of 750kV autotransformer zero -sequence differential protection, introduces the zero -sequence differential protection with the ratio brake characteristic and the merits of the zero - sequence differential protection.