Research On Transformer Protection Based On The Fuzzy Theory

The paper analyses the principles of distinguishing internal faults current from inrush current and their defects at the present time on the basis of investigating widely the existing papers on identification of inrush current. According to the characteristics of inrush current a series of new approaches of discrimination inrush current by utilizing fuzzy set is presented. And then the algorithm of transformer protection is achieved based on 80C196 system. Meanwhile, using the oscilloscope data from dynamic test the paper verifies this scheme. The result shows that inrush identification scheme making use of fuzzy theory overcomes some deficiency of traditional protection, betters performance of transformer relaying, and gives attention to action speed and selectivity of protection. Liu ying (Power system and its automation)Directed by: prof. Wang zeng-ping...