南方电网技术2011，Vol.5Issue(5)：77-80,4.
变压器零序差动保护制动电流算法探讨
On the Algorithm of Resisting Current of Transformer’s Zero-sequence Differential Protection
罗云照 1陈朝晖2
作者信息
- 1. 中国南方电网超高压输电公司,广州510620
- 2. 中国南方电网电力调度控制中心,广州510623
- 折叠
摘要
Abstract
When setting down the converter transformer protection scheme of Yunnan-Guangdong DC project,a poor result is found in the resisting current from a new algorithm based on the principle of phase-current differeatial of transformer’s zero-sequence differential protection at the high volage side.Through example calculation and theoretical analysis,this paper points out that the results of the new algorithm will lead to malfunction as it is used in the single side power source system with neutral-point directly grounding such as converter transformer protection,and also lead to a smaller resisting current than that of the traditional algorithm as it is used in the double side power source system such as double-windings step-up transformer in high voltage power plant,and the zero-sequence resisting current from the new algorithm is smaller than that from the traditional algorithm,resulting in a weaker effect for treating the single phase grounding fault beyond protection zone.Therefore,the new algorithm should be improved further.关键词
双绕组变压器/零序差动保护/制动电流Key words
double-windings transformer/zero-sequence differential protection/resisting current分类
信息技术与安全科学引用本文复制引用
罗云照,陈朝晖..变压器零序差动保护制动电流算法探讨[J].南方电网技术,2011,5(5):77-80,4.
