Three-phase five-limb transformers are widely used in China's distributing networks and are important equip-ment in supply stations.With the continuous development of ultra-high voltage technology,the phenomenon of DC bias has become increasingly frequent in recent years.DC bias is extremely harmful to transformers,including core saturation,increased losses,temperature rise vibration,all of which affect the normal operation of transformers.In severe cases,it may even affect the stability of power grid.Therefore this paper establishes a three-dimensional finite element field circuit coupling calculation model for three-phase five-limb transformers to analyze the current distortion mode and physical rea-sons when DC bias occurs on the load side with different properties of loads.
关键词
三相五柱变压器/直流偏磁/场路耦合模型/励磁电流
Key words
three-phase five-limb transformer/DC bias/field circuit coupling model/excitation current
维普
万方数据