Simulation Analysis of Negative Phase Sequence Current of YN, vd Balance Transformer YN,vd平衡变压器负序仿真分析
The unbalanced degrees of current in primary winding under different load conditions are discussed, which are based on the general expressions of negative phase sequence current. 结合负序电流的通用表达式,讨论了在不同负荷条件下的原边电流不平衡度。
The criteria, algorithms and realization of several new types of microcomputer based protection are discussed in the paper, including two types of negative phase sequence directional power protection, second-harmonic current of exciting winding type and longitudinal zero-sequence voltage type, and single-element cross differential protection. 讨论了微机式新型转子二次谐波型负序功率方向保护、纵向零序电压型负序功率方向保护及单元件横差保护的判据、算法及有关实现方法。