The report provides engineering details covering possible wind farm electrical layouts, equipment ratings, system grounding, transformer connections and characteristics, harmonics and sub-harmonics analysis, voltage and frequency ride-through requirements, and protective. The report provides engineering details covering possible wind farm electrical layouts, equipment ratings, system grounding, transformer connections and characteristics, harmonics and sub-harmonics analysis, voltage and frequency ride-through requirements, and protective. Working group C25 was given the assignment to write a report to provide guidance on present relay protection and coordination practices at Wind-powered Electricity generating Plants (WEP). The report includes protection of generator step up transformers, collector system feeders. Look to Littelfuse for circuit protection and sensing solutions that boost the performance of wind turbines and the efficiency of wind energy transmission. Our industrial power fuses prevent damage to generating equipment, power lines, and transformers. We also make arc flash relays, thermistors. Abstract: This paper explores the relay protection of the power grid with large-scale wind power access across the globe.