New protection co-ordination methods in the presence of distributed generation

A critical review of AC Microgrid protection issues and available solutions

“…A protection coordination scheme based on OC principle and time dependent characteristics of current to prevent high fault clearing times and maximizing DG connection to MV distribution networks is presented in [33]. This strategy provides extra benefit of running extensive radial networks with directly-coupled DGs (DDGs) or closed-loop networks with converter-based DGs (C-DGs).…”

Impact of Distribuion Generation on Protection Coordination

“…Ho wever, the prime limitation of this method is that it cannot handle many fault current redistributions at a time. After that, Jager et al [8] suggested a coordination method for ring and radial d istribution network containing DG. But the above scheme suffers with the problem of sympathy trips depending upon the location and level of fau lt [9].…”

Impact of distributed generation on distribution networks

“…Taking in account that it was assumed a fixed value for the pickup current of the relays (160 A), the time multiplier setting is the critical variable to be calculated, according to (2), where (2)…”