Abstract

Due to rapid growth of loads in a distribution system and more network connections, high current flows in the\nevent of short circuit faults in the system. In such cases, the relay co-ordination is disturbed and hence the equipment like\ncircuit breakers needs to be enhanced in ratings perspective. So the relay can handle the new operating currents which are\noften expensive retrofit costs. The line impedance is kept normally low to accommodate more number of loads and\ndistributed generator (DG) units to the existing system. This configuration allows very huge current in the system whenever\nshort circuit takes place. Hence to limit such currents, a technique is required to adopt. The fault current can be reduced to\nacceptable value in coordination with existing protection system by fault current limiter. In this paper, the operation of Fault\nCurrent Limiter (FCL) with voltage sensing scheme is discussed to place it in a typical distribution system to place FCL is\nvery important in connection with the system complexity. Separate program is developed in Electromagnetic Transient\nProgram (EMTP) to place FCL more optimally. An IEEE 6 bus system has been considered for fault analysis and placement\nof FCL to reduce the impact of fault.