APPLICATION OF A MULTIFUNCTIONAL DISTANCE PROTECTIVE IED IN A 15 KV DISTRIBUTION NETWORK

摘要

EPCOR Utilities Inc. is the electric utility company in Edmonton, Alberta, Canada. One of EPCOR's capital upgrade projects is to replace obsolete protective relays for their 15 kV distribution substations. Eight of EPCOR's 15 kV distribution substations have obsolete feeder relays that are starting to fail and raise concerns regarding system reliability and safety. The distribution feeders for these substations consist of a combination of cables and aerial lines. The existing relays protecting these feeders are equipped with overcurrent and reclosing elements.