阻抗匹配平衡牵引变压器负序分析

Analysis of Negative Phase-Sequence Current of Impedance-Matched Balance Transformer

三相电压到二相电压间的对称变换可有效减弱负序对电力系统的影响,为此,给出了适用于任意接线牵引变压器的通用负序电流表达式,分析了阻抗匹配平衡变压器的负序特性,讨论了其不同负荷条件下一次侧电流不平衡度,并结合某牵引变电所的一组实测数据将其与YN d11接线牵引变压器进行分析比较,结果表明,阻抗匹配平衡变压器能有效减弱负序电流。

The general expressions of negative phase-sequence current in the traction transformer with arbitrary connection are presented. The characteristics of negative phase-sequence in the impedance-matched balance transformer are analyzed. The unbalanced degree of current in primary winding under different load conditions is discussed. The impedance-matched balance transformer is analyzed and compared with the traction transformer with YNd11 connection using the testing data of a traction substation.