01920cam a2200325 a 4500 EG-GiCUC 20250223031400.0 151228s2015 ua h f m 000 0 eng d EG-GiCUC eng EG-GiCUC eng Deposite M.Sc Cai01.13.07.M.Sc.2015.Mo.I Mohamed Ahmed Ahmed Elsayed Implementation of an economical multifunctional digital relay for three phase induction motors / Mohamed Ahmed Ahmed Elsayed ; Supervised Essam Eldin M. AboElzahaab تصميم و تنفيذ جهاز وقاية اقتصادى رقمى متعدد الوظائف للمحركات الحثية ثلاثية الاوجه Cairo : Mohamed Ahmed Ahmed Elsayed , 2015 102 P. : facsimiles ; 30cm Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Electrical Power and Machines This thesis presents an integrated, economical, actual, and industrial multifunction digital relay MDR1 to be used in the protection of three phase induction motor. Possible faults are studied with their causes. Recommended protective functions are presented and implemented using micro - controller 8951. Flowcharts for each routine for each function are implemented with corresponding software programs. Nine functions were designed and implemented inside the relay MDR1 and these functions are protection against over and under current, over and under voltage, unbalanced currents and voltages, over temperature of windings, and earth fault protection Issued also as CD Digital Intelligent Protection relay Essam Eldin Mohamed AboElzahaab , Supervisor http://172.23.153.220/th.pdf Nazla Revisor Samia Cataloger ddc TH 54159 54159 ddc 0 CUCL cl210 2024-02-11 Cai01.13.07.M.Sc.2015.Mo.I 01010110067337000 2023-09-22 00:00:00 TH ddc 0 CUCL cl2u8 2024-02-11 Cai01.13.07.M.Sc.2015.Mo.I 01020110067337000 2023-09-22 00:00:00 67337.CD CD