摘要
Scott变压器由于其结构的特殊性,差动保护也与传统电力变压器差动保护存在较大差异。针对实际应用中差动保护方案存在的不足,提出了一种新的方案。该方案采用两相差动方式,结合自适应调整二次谐波制动系数的分相制动原理,大大提高了差动保护的整体性能。对该方案与传统方案进行理论分析和RTDS仿真研究比较,该方案明显优于传统方案,且可按相配置变压器差动保护整定值,增加了保护的灵活性,完全满足Scott变压器差动保护要求。
Differential protection is one of the primary protections for power transformer,which has good reliability. Because of the unique structure of Scott transformer,its differential protection is different with that of traditional power transformer.To improve the practical performance of differential protection,a new protection scheme is proposed in the paper.With two differential protection modes,the whole performance of differential protection is greatly improved by combining phase constraint theory of adaptive constraint coefficient of the second harmonic.The proposed scheme is better than traditional scheme evidently through theoretical analysis and RTDS simulation.And the setting values of differential protection for transformer can be set by phase,which increases the flexibility of the protection, and meets the requirements of differential protection of Scott transformer.
出处
《现代电力》
2011年第5期59-62,共4页
Modern Electric Power
