Research On Transient Digital Simulation Of Three-winding Transformer And Autotransformer

In view of the importance of transformer in power system and the correct operation ratio of transformer protection is currently relatively low,this paper makes detailed digital simulation research on fault transient process of three-phase three-winding transformer and autotransformer.The transient simulation models of three-phase three-winding transformer and autotransformer are established,node-pair method is used to create network equation and simulation computation,and makes research on all kinds of internal faults of transformer and the influence of grounding reactance to autotransformer short current.This method can simulate the transient procedure of all inner faults of transformer,which happen at any location and any number of turns,it can easily communicate with network by modifying the associated matrix,and it has some application value in project.The validation of the method is right by the simulation.