AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE
Hajjar, A., Abdelaziz, A., Talaat, H., Nosseir, A. (1999). AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE. EKB Journal Management System, 2(2nd International Conference on Electrical Engineering ICEENG 1999), 411-423. doi: 10.21608/iceeng.1999.62531
Ammar A. Hajjar; A. Y. Abdelaziz; H. E.A. Talaat; A. I. Nosseir. "AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE". EKB Journal Management System, 2, 2nd International Conference on Electrical Engineering ICEENG 1999, 1999, 411-423. doi: 10.21608/iceeng.1999.62531
Hajjar, A., Abdelaziz, A., Talaat, H., Nosseir, A. (1999). 'AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE', EKB Journal Management System, 2(2nd International Conference on Electrical Engineering ICEENG 1999), pp. 411-423. doi: 10.21608/iceeng.1999.62531
Hajjar, A., Abdelaziz, A., Talaat, H., Nosseir, A. AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE. EKB Journal Management System, 1999; 2(2nd International Conference on Electrical Engineering ICEENG 1999): 411-423. doi: 10.21608/iceeng.1999.62531

AN IMPROVED FORMULATION FOR OPTIMAL OVERCURRENT RELAY COORDINATION USING LINEAR PROGRAMMING TECHNIQUE

The International Conference on Electrical Engineering
Article 43, Volume 2, 2nd International Conference on Electrical Engineering ICEENG 1999, November 1999, Page 411-423  XML PDF (2.99 MB)
Document Type: Original Article
DOI: 10.21608/iceeng.1999.62531
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Authors
Ammar A. Hajjar1; A. Y. Abdelaziz2; H. E.A. Talaat3; A. I. Nosseir4
1Graduate student, Faculty of Mechanical and Electrical Engineering, Tishreen University, Latakia, Syria
2Assistant professor, Electrical power & Machines Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt
3Associate professor, Electircal power & Machines Department, Faculty of Engineering, AM Shams University, Cairo, Egypt
4Professor, Electrical power & Machines Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt
Abstract
In this paper the problem of directional overcurrent relays coordination in interconnected power networks is presented and solved using the optimization theory. Linear programming with Simplex two-phase method is applied to minimize the operating time of the relays. The insignificance of weighting factors and far-end fault consideration in the problem formulation is proved, through a mathematical example, by simulation, mathematically, graphically and by sensitivity analysis. The current transformer (CT) selection is achieved based on the maximum load and fault currents in order to prevent the miscoordination problem resulting from CT's saturation. A complete algorithm for calculating the optimal operating times is introduced and applied to sample examples.
Keywords
interconnected networks; overcurrent relay; coordination; Optimization; and enhanced formulation
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