Universal approach to tackle the threat of miscoordination between fuse and recloser in distribution network with distributed generations

The operating margin between fuse and recloser is reduced due to redistribution of magnitude of fault current by incorporation of DG in power distribution network. This paper presents a new approach to tackle unnecessary disconnection of fuse due to wrong coordination between recloser and fuse in power distribution network during multiple Distributed Genrations (DGs) interconnections. By acquiring the peak vlaue of recloser and fuse current and modifying the pick-up current of the recloser, the presented scheme enhances margion between recloser and fuse. Performance of the presented scheme has been evaluated on different types of fauults/abnormalities the data of which were generated by modeling the power distribution system in PSCAD/EMTDC software package. The effect of various type and capacity of DGs (Inverter/synchronous based) has been checked on the available margin between recloser and fuse. Furthermore, performance of the presented scheme has also been validated on varying fault location and mutiple DG trippings with respect to margin between fuse and recloser. The simulation results indicate that the presented scheme is capable to withhold proper maigin between recloser and fuse irrespective of type of faults/abnormalities.