Analysis of Application of 500 kV Transformer with Low Reactance Grounding

On the basis of theoretic analysis of limiting short circuit current by low reactance grounding transformer neutral point,and combining engineering practices,according to the effects of current limiting of adding low reactance at neutral point under different operation modes,the effects of current limiting after low reactance was added are analyzed.Proper reactance values and its configurations are proposed.In addition,neutral point insulation matching and relay protection problems are also studied.Solutions are presented.