Zekry A.Shaker A.Ossaimee M.Salem M.S.Abouelatta M.Shehata, K., Modern Science and Arts University, Giza, Egypt; Bahaa, A., Modern Science and Arts University, Giza, Egypt; Morad, K., Modern Science and Arts University, Giza, Egypt; Sharaf, A., Modern Science and Arts University, Giza, Egypt2020-01-092020-01-092018https://doi.org/10.1007/s10825-017-1082-8https://t.ly/kNvLmThis paper presents a design and implementation of two current relay prototypes. The first one is based on FPGA, it protects against over-current, phase loss and locked rotor. This design is implemented, downloaded and tested on Altera Flex 10k10LC84-4 device. The second prototype is microcontroller based Multi Function Relay, it protects against over current, undercurrent, phase loss, locked rotor, phase unbalance and ground fault. This design is implemented and tested on Atmel microcontroller ATMega16PC0351I. Finally, both prototypes specifications were referenced to SMWAHA EOCR-Schneider Electric protection relays EOCR-SS and EOCR-3EZ respectively according to the European and Korean standards. � 2004 EEE.en-USOctober University for Modern Sciences and ArtsUniversity for Modern Sciences and ArtsMSA Universityجامعة أكتوبر للعلوم الحديثة والآدابComputer simulationData acquisitionElectric transformersEquipment testingFrequenciesMicrocontrollersRelay control systemsRotorsCurrent relayDigital relayElectromechanical relayMulti function relayField programmable gate arraysConference Paperhttps://doi.org/10.1007/s10825-017-1082-8