Coordination of Recloser and Fuse in a Distribution System With the integration of Distributed Generation and Superconducting Fault Current Limiter

Abstract

Distributed Generation (DG) has increased largely from the past two decades due to its advantages. In the distribution network, the superconducting fault current limiters(SFCL) are placed to reduce the amount of fault current by the effect of impedance. In this paper, we studied the fuse recloser coordination when DGs and SFCL are placed into the distribution system. Normally fuses are placed near the distribution side and the reclosers are placed near the substation. Whenever apermanent fault occurs in the distribution network, the fuse is set to operate before the delayed operation of the recloser to overcomemiscoordination problem. By the integration of DG, the fault current seen by the recloser is less than the fault current seen by the fuse thereby causing the miscoordination. By placing the SFCL into the distribution system, the fuse may not melt during the delay operation of the recloser because of insufficient heat due to the decrease in the fault currents. This paper presents a control strategy with which the coordination is maintained and the load is shared according to the ratings of DGs.