Design of complete replacement of electromechnical relays with microprocessor relays for Unit 1 and Unit 2 (450MVA). Design of replacement of electromechanical line differential relays with microprocessor relay for Unit 3 (450MVA). Design included removal drawings for existing equipment and wiring, installation drawings with separate panel mounted units for retrofit to existing control boards, new AC and DC schematics, interface to plant DCS, relay settings, and commissioning.