Background The Otter Rapids Generating Station is a 40-year-old, hydro- electric generating station with four 46 MVA generators. The station is unique in that the two dual secondary generator step-up (GSU) transformers are both equipped with a high voltage tap-changer allowing the station to transmit power at either 115 or 230 kV. Challenges Low voltage bus ties add to the complexity of the station protection scheme. The project was completed successfully and returned to service early following the second outage. In line with the electrical infrastructure upgrade, Eaton Electrical Services & Systems was awarded a turnkey project to upgrade the station protection to a state-of-the-art digital pro- tection scheme. Success Story: Infrastructure upgrade Out with the old, in

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