Main Article Content
Abstract
This paper discuss the fault analysis and differential protection scheme of the three phase power transformers. The relay operates mainly during the internal fault condition and it must be insensitive to any fault outside the zone of protection. In this paper, a fuzzy logic based differential protection schemes has been used. It blocks the tripping during external fault condition or magnetizing inrush current and it trips the relay during internal faults. The simulation result of fuzzy logic based differential relay for three phase power transformer shows the fast tripping during internal fault and also avoids the mal operation of relay during external fault.