Power system phenomena and their impact on the performance of relaying systems

Electrical and Computer Engineering
NYU Community Event

Speaker:  Mohamed Ibrahim

Host Faculty: Professor Francisco de Leon

Power system phenomena are normally captured and defined during the analysis of power system disturbances. Power system phenomena provide useful and basic information and knowledge that can enhance the required background for good and sound relaying basics. In addition, it can enhance the system disturbance analysis process to arrive at the correct time line to be able to isolate the faulted element and restore the service to the balance of the power system. The effects on relaying system will be also highlighted so that optimization of relaying system design and its intended function can be achieved.

This presentation will cover the major power system phenomena derived from the analysis of system disturbances using actual DFR records. For example: Power system oscillations leading to the simultaneous tripping of both ends of an EHV transmission line; Generator rotor oscillations with the power system; Appearance of 120 HZ current at the generator rotor surface during a high side phase-to-ground fault; Inadvertent (accidental) energization of a 170 MW hydro generator; Loss of excitation of a 200 MW unit caused by an operator error; Generator neutral zero sequence voltage coupling through step-up transformer inter- winding capacitance during a high side ground fault; Generator active and reactive power outputs during a GSU high side L-g fault; Circuit breaker restikes; Current transformer saturation; Shunt capacitor bank outrush into; Ferranti voltage rise
on open ended EHV line.

About the Speaker
Mohamed Ibrahim is a registered Professional Engineer in New York State. He was nominated as a Fellow in the IEEE in 2000 for his contribution to the Protection and Control field. From 1964 to 1969, he worked as a teaching assistant at Helwan University in Egypt. From 1970 to 1980, he worked with the American Electric Power Service Corporation in New York where he was a Senior Engineer. He was a member of one of the early research teams in computer relaying. In October 1980, he joined the New York Power Authority. He retired as the Director of the system Protection and Control Engineering Section at the end of 2004. From 2004 to present, he lectured protection and control related courses to utility engineers in the USA and oversees. In 2006 he founded MOH Electric, Inc. where he is the president. He participated as a visiting lecturer at the Auburn University, Rensselear Polytechnic Institute and Washington State University. He served as a member of the adjunct teaching staff at Poly where he taught several courses for graduate MS programs. In 2000 he was appointed as a non - resident Professor at the University of Mansourah, Egypt. He is the author and co - author of twenty – five (25) technical papers in the computer relaying and protection areas. He received several awards and recognition for his papers and research work. He is the author of the first book titled “Disturbance Analysis for Power Systems” that was published by Wiley on October 10, 2011, documenting his over 40 years of experience in the protection and control and system disturbance analysis areas.