APPLICATION OF FUZZY SET THEORY IN TRANSFORMER PROTECTIONS
Whng Zengping;Gao Zhongde; Zhang Ju; Li Ha iying; Wang Tieqiang(North China Electric Power University. 071003. Baoding. China)Liu Zhuo (Harbin Institute of Technology. 150001. Harbin. China)
This paper presents a scheme that fuzzy set theory is applied in transformer protections. which can discriminate magnetic inrush current by using fuzzy logic and fuzzy pattern recognition. The digital simulation shows that the scheme can diminish a lot of defects of transformer protection and improve the performance. The fuzzy set theory makes a perfect coordination of relay's speed and selectivity.