• 106 Citations
  • 6 h-Index
20042018
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Research Output 2004 2018

  • 106 Citations
  • 6 h-Index
  • 21 Conference contribution
  • 1 Article
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Conference contribution
2004
13 Citations (Scopus)

Travelling waves based earth fault location in 400 kV transmission network using single end measurement

Elhaffar, A. & Lehtonen, M., 2004, 2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow. p. 53-56 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric fault location
Electric power transmission networks
Earth (planet)
Wavelet transforms
Antenna grounds
2005
5 Citations (Scopus)

An improved GPS current traveling-wave fault locator in EHV transmission networks using few recordings

Elhaffar, A. & Lehtonen, M., 2005, 2005 International Conference on Future Power Systems. Vol. 2005. 1600598

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric power transmission networks
Global positioning system
Electric fault location
Adenosinetriphosphate
Electric power systems
2007
1 Citation (Scopus)

Effect of current transformer transient models on the detection of traveling waves

Elhaffar, A. & Lehtonen, M., 2007, LESCOPE'06: 2006 Large Engineering Systems Conference on Power Engineering - Conference Proceedings. p. 158-161 4 p. 4059386

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric instrument transformers
Electric fault location
Frequency response
Transfer functions
Transducers
6 Citations (Scopus)

Experimental investigations on multi-end fault location system based on current traveling waves

Elhaffar, A., Elkalashy, N. I. & Lehtonen, M., 2007, 2007 IEEE Lausanne POWERTECH, Proceedings. p. 1141-1146 6 p. 4538476

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric fault location
Electric instrument transformers
Wavelet transforms
Electric power transmission networks
Adenosinetriphosphate
12 Citations (Scopus)

High frequency current transformer modeling for traveling waves detection

Elhaffar, A. & Lehtonen, M., 2007, 2007 IEEE Power Engineering Society General Meeting, PES. 4275992

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric instrument transformers
Electric fault location
MATLAB
Frequency response
Transfer functions
3 Citations (Scopus)

Impact of high resistance arcing fault characteristics on behavior of DWT-based detection in MV networks

Elkalashy, N. I., Elhaffar, A., Lehtonen, M., Darwish, H. A., Izzularab, M. A. & Taalab, A. M. I., 2007, 2nd International Conference on Electrical and Control Technologies, ECT 2007. Kaunas University of Technology, p. 171-176 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Discrete wavelet transforms
Earth (planet)
Electric potential
Adenosinetriphosphate
Electric grounding
3 Citations (Scopus)

Signal processing applications to current traveling wave fault locators for EHV transmission networks

Elhaffar, A. & Lehtonen, M., 2007, ICSPC 2007 Proceedings - 2007 IEEE International Conference on Signal Processing and Communications. p. 616-619 4 p. 4728394

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric power transmission networks
Signal processing
energy
Time delay
travel
2008
3 Citations (Scopus)

Evaluation of travelling wave fault location methods based on field measurements

El Haffar, A. & Lehtonen, M., 2008, IET 9th International Conference on Developments in Power Systems Protection, DPSP 2008. 536 CP ed. p. 600-604 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric fault location
Electric power transmission networks
Travel time
Wavelet transforms
Frequency bands
7 Citations (Scopus)

Multi-end traveling wave fault location based on current traveling waves

Elhaffar, A. & Lehtonen, M., 2008, 16th Power Systems Computation Conference, PSCC 2008. Power Systems Computation Conference ( PSCC )

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric fault location
Wavelet transforms
Electric instrument transformers
Electric power transmission networks
Adenosinetriphosphate
2009
10 Citations (Scopus)

Evaluation of probabilistic-based selectivity technique for earth fault protection in MV networks

Elhaffar, A. M., Elkalashy, N. I., Tarhuni, N. G., Abdel-Fattah, M. F. & Lehtonen, M., 2009, 2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future. 5282189

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric instrument transformers
Earth (planet)
Electric potential
Adenosinetriphosphate
Discrete wavelet transforms
4 Citations (Scopus)

Windowed standard deviation-based transient feature extraction for earth fault protection in MV networks

Elkalashy, N. I., Elhaffar, A. M., Abdel-Fattah, M. F., Lehtonen, M. & Tarhuni, N. G., 2009, Proceedings of the 44th International Universities Power Engineering Conference, UPEC2009. 5429586

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Feature extraction
Earth (planet)
Adenosinetriphosphate
Electric potential
2010
2 Citations (Scopus)

Evaluation of chirp detector-based travelling wave localization of earth faults in MV networks

Elkalashy, N. I., Tarhuni, N. G., Elhaffar, A. M. & Lehtonen, M., 2010, 10th IET International Conference on Developments in Power System Protection, DPSP 2010 - Managing the Change. 558 CP ed. Vol. 2010.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric instrument transformers
Chirp modulation
Earth (planet)
Detectors
Adenosinetriphosphate
2012
5 Citations (Scopus)

An optimized fault location system based on traveling waves for transmission networks

Elhaffar, A., 2012, 2012 16th IEEE Mediterranean Electrotechnical Conference, MELECON 2012. p. 954-958 5 p. 6196585

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric fault location
Electric power transmission networks
Adenosinetriphosphate
Discrete wavelet transforms
Observability
2015

Optimizing differential protection settings for power transformers

Saad, S. M., Elhaffar, A. & El-Arroudi, K., 2015, Proceedings - International Conference on Modern Electric Power Systems, MEPS 2015. Institute of Electrical and Electronics Engineers Inc., 7477186

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Power transformers
Adenosinetriphosphate
2017
7 Citations (Scopus)

Applying adaptive protection scheme to mitigate the impact of distributed generator on existing distribution network

Saad, S. M., El Naily, N., Elhaffar, A., El-Arroudi, K. & Mohamed, F. A., May 10 2017, 2017 8th International Renewable Energy Congress, IREC 2017. Institute of Electrical and Electronics Engineers Inc., 7926041

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric power distribution
Distributed power generation
Relay protection
Circuit theory
Energy resources
4 Citations (Scopus)

Mitigating the impact of Distributed Generator on medium Distribution Network by adaptive protection scheme

El Naily, N., Saad, S. M., Elhaffar, A., Hussein, T. & Mohamed, F. A., May 10 2017, 2017 8th International Renewable Energy Congress, IREC 2017. Institute of Electrical and Electronics Engineers Inc., 7925989

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Distributed power generation
Electric power distribution
Adenosinetriphosphate
Power quality
Topology
2018
1 Citation (Scopus)

Adaptive overcurrent protection to mitigate high penetration of distributed generation in weak distribution systems

El Naily, N., Saad, S. M., Wafi, J., El Haffar, A. & Husseinzadch, N., Aug 27 2018, 2017 9th IEEE-GCC Conference and Exhibition, GCCCE 2017. Institute of Electrical and Electronics Engineers Inc., 8448233

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Overcurrent protection
Distributed power generation
Electric power distribution
penetration
Relay protection
1 Citation (Scopus)

Enhancement of over current coordination for a distribution system connected to a microgrid using unidirectional fault current limiter

Saad, S. M., Naily, N. E., Wafi, J., El Haffar, A. & Mohamed, F. A., May 21 2018, 2018 9th International Renewable Energy Congress, IREC 2018. Institute of Electrical and Electronics Engineers Inc., p. 1-6 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fault current limiters
Distributed power generation
Electric power distribution
Relay protection
Electric fault currents

Experimental and EMTP modeling of numerical transformer protection for enhancing relay transient performance: A case study

Saad, S. M., El Naily, N. & El Haffar, A., Aug 27 2018, 2017 9th IEEE-GCC Conference and Exhibition, GCCCE 2017. Institute of Electrical and Electronics Engineers Inc., 8448174

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Transformer protection
Adenosinetriphosphate
Power transformers
relay
transformers

MEC based scaling laws for a tape-wound transformer with voltage regulation and core loss included

Tahir, A., El Haffar, A., Sudhoff, S. & Pekarek, S., Aug 27 2018, 2017 9th IEEE-GCC Conference and Exhibition, GCCCE 2017. Institute of Electrical and Electronics Engineers Inc., 8447913

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Scaling laws
transformers
Voltage control
scaling laws
Tapes

Simulation of distance protection for parallel transmission lines

Al-Mahrooqi, M., Al-Yaqoubi, M., Al-Ghafri, H., Al-Saadi, M., Soliman, H. & El Haffar, A., Aug 27 2018, 2017 9th IEEE-GCC Conference and Exhibition, GCCCE 2017. Institute of Electrical and Electronics Engineers Inc., 8447970

Research output: Chapter in Book/Report/Conference proceedingConference contribution

transmission lines
Electric lines
Electricity
Electric potential
simulation