Y/>/平衡变压器运行特性分析与模型试验

OPERATION CHARACTERISTIC ANALYSIS AND MODEL TESTS OF Y/>/ CONNECTED BALANCE TRANSFORMER

该文分析了Y/>/平衡变压器的接线原理,论证了该变压器在不同运行工况时两侧电流的映射关系,在此基础上对该变压器的模型进行了全面的试验验证。试验结果表明:该变压器的理论分析正确,模型的参数和结构设计合理,工艺易于实现;当负荷大范围变化时,原方三相系统的对称性好,副方任一相的输出电压几乎不受另一相负荷变化的影响,抑制负序分量的能力强。应用于电气化铁道做牵引供电变压器时,不仅能较好抑制负序电流对电力系统的影响,而且能提高牵引网的电压水平,有利于电力机车的安全稳定运行。

In this paper, the connection scheme of Y/>/ is analyzed, and the relationship between primary and secondary currents under different working conditions are presented. The theoretical analysis is verified by experiments done on a model transfonner, which shows that the theoretical analysis of this transfonner is correct, the model transformer's parameters and construction design is rational, and that the technology is easy to realize. When loads vary in large scale, 3-phase system at the primary side is almost symmetrical; while at the secondary side, phase voltage is seldom affected by loads variation of another one. Besides, the transformer can strictly restrain the negative sequence components. The application of working as traction transformer on electric railway is of great advantage to the safe and stable operation of electric locomotive, for it can not only restrain the effect of the negative sequence current on power system, but also raise the voltage level of traction network.