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Okba M.H.,Egyptian Electricity Transmission | Saied M.H.,Abu Qir Fertilizers and Chemical Industries Co. | Mostafa M.Z.,Alexandria University | Abdel-Moneim T.M.,Alexandria University
IECON Proceedings (Industrial Electronics Conference)

Power Electronic converters are known to be generators of harmonics on both of their alternating current (AC) and direct current (DC) sides. They also transfer existing harmonics from one side to the other with an associated change of frequency. In other words, the converters intercouple the AC and DC systems and thus act as a transfer medium for harmonics. In part I of this two-part paper, sources of current and voltage harmonics, influence of power electronic converters on high voltage direct current (HVDC) transmission systems, and harmonics flow analysis with the 12-pulse converters of HVDC systems, are outlined. © 2012 IEEE. Source

Abou El-Ela A.A.,Menoufia University | Allam S.M.,Menoufia University | Shatla M.M.,Egyptian Electricity Transmission
Electric Power Systems Research

Recently, the distributed power generation (DG) takes more attention, because of the constraints on the traditional power generation besides the great development in the DG technologies. To accommodate this new type of generation, the existing network should be utilized and developed in an optimal manner. This paper presents an optimal proposed approach (OPA) to determine the optimal sitting and sizing of DG with multi-system constraints to achieve a single or multi-objectives using genetic algorithm (GA). The linear programming (LP) is used not only to confirm the optimization results obtained by GA but also to investigate the influences of varying ratings and locations of DG on the objective functions. A real section of the West Delta sub-transmission network, as a part of Egypt network, is used to test the capability of the OPA. The results demonstrate that the proper sitting and sizing of DG are important to improve the voltage profile, increase the spinning reserve, reduce the power flows in critical lines and reduce the system power losses. © 2010 Elsevier B.V. All rights reserved. Source

Abdel-Latief A.N.,Egyptian Electricity Transmission | Abdel-Gawad A.F.,Zagazig University | Mandour M.E.,Zagazig University
43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010

Presence of Flexible Alternating Current Systems FACTS device like Static Synchronous compensation STATCOM in the transmission system improves system stability and enhances system voltage, but certain other problems emerge in the field of power system protection, in particular, transmission line protection. This paper presents simulation results for investigation STATCOM impact on transient components of voltage and current during several types of faults. Also, this paper analyzes the apparent impedance which are seen by the relay in presence of STATCOM in single line to ground fault loop for identifying all factors which cause incorrect impedance measurement. These analyses have been implemented with an extensive simulation results to plot the relation between the apparent resistance and reactance against the fault location. In addition, the internal trip boundary characteristics, which will be required in presence of STATCOM to adapt the relay settings, are also plotted in R-X plan. These charactristics have been compared with the ideal Internal charactrsitic without the STATCOM as for single line to ground faults and line to line faults. Finally, the work suggests a new approach relies on Artificial Neural Networks ANN to achieve the resulted tripping characteristics of transmission line in presence of the STATCOM. Source

Ibrahim D.K.,Cairo University | Rezk M.E.,Egyptian Electricity Transmission | Abo El-Zahab E.E.-D.,Cairo University
ENERGYCON 2014 - IEEE International Energy Conference

This paper presents a new adaptive tripping time scheme which provides high speed distance relay operation under fault conditions near the relay point and provides high secured detection for the faults occurred at the end of the protected transmission line with tripping time less than one power cycle. The proposed scheme automatically controls the data window length to adaptively speed up its response under various fault conditions. The advanced feature of this scheme provides capability for fast tripping decisions with secure operation. The proposed scheme possesses the advantage of removing decaying DC offset component in the current signals according to the length of data window, and compensates the capacitive current during the calculation of the fault impedance. Extensive simulations show that the proposed scheme provides better protection performance compared with the conventional schemes of the fixed data window. © 2014 IEEE. Source

Kamel M.M.,Suez Canal University | Azab H.A.,Suez Canal University | El-Maragy H.A.,Egyptian Electricity Transmission | Mohamed A.M.,Abu Sultan Power Plant

A new electroplating bath for tin deposition was developed. Sodium citrate was used as a complexing agent. The effects of bath composition, current density and temperature on the cathodic polarization, cathodic current efficiency, morphology and structure of deposit were studied. Optimum conditions for producing sound and satisfactory tin deposits were: 0.20 M SnCl2 2H20 and 0.20 M sodium citrate at pH = 5, c. d. = 3.80 mA cm -2 and 25 °C. The surface morphology of the deposited tin was investigated using SEM. The crystal structure was examined by X-ray diffraction analysis. The tin deposits have a tetragonal structure, (β-Sn form). The corrosion behaviour of electrodeposited tin in 3 % NaCl solution was examined by weight loss measurements. Tin coatings reduce the corrosion rate of steel from 0.190 to 0.059 mm y-1. Source

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