Egyptian Electricity Holding Company

Cairo, Egypt

Egyptian Electricity Holding Company

Cairo, Egypt
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Khalaf A.A.M.,Minia University | Mokadem M.S.A.,Egyptian Electricity Holding Company
Proceedings of the International Conference on Microelectronics, ICM | Year: 2017

The IEEE 802.15.4 and ZigBee protocol stack offers a practical application solution for low cost, low data rate, and low energy consumption characteristics for Wireless Sensor Networks (WSN). In this paper, there are two scenarios studied. First, the three possible topologies (Star, Cluster tree and Mesh) are compared with each other at the case of various nodes failure as ZC, ZR and ZED to certify the reliability of this networks. There is just one ZigBee coordinator in each topology. The comparison includes the statistics: Data Traffic Sent, Data Traffic Received, Throughput and Delay. These statistics are performed taking into account the specific features and recommendations of the IEEE 802.15.4/ZigBee standard. Second, the Cluster Tree Topology with a single ZC is chosen and compared with a similar network that has an additional ZC. The network will two ZC's forms two PANs. The comparison includes the statistics: Data Traffic Received, Data Traffic Sent, Throughput and Delay. The simulations will be performed using Riverbed Modeler Academic Edition 17.5 Simulation. © 2016 IEEE.

Habib M.A.,Egyptian Electricity Holding Company | Nasart L.S.,Aswan University | Sharkawy R.M.,Arab Academy for Science and Technology
Proceedings of the 2016 IEEE International Conference on Dielectrics, ICD 2016 | Year: 2016

This study aims to improve electrical properties of cross-linked polyethylene with respect to mechanical characteristics by adding inorganic fillers. Blends of XLPE with various inorganic fillers such as: CaCo3 and kaolin are prepared with 20%, 30% and 50% concentration percentages. The dielectric strength of the blends is tested in several thermal conditions such as (0, 25 and 100 C°) to simulate different types of climates. Thermal aging is simulated for 24 hours in several temperatures (120, 160, 200 °C) to investigate how the electric properties of composites are affected by very high temperatures stress for 24 hours. The experimental results obtained are compared to each other as regards the dielectric strength of XLPE power cables and its variation with respect to filler concentration to an improvement the electrical performance of cross-linked polyethylene high voltage cables. A MATLAB code has been developed to give interpolated values between different percentages of inorganic filler. © 2016 IEEE.

Mostafa H.E.,Suez Canal University | El-Sharkawy M.A.,Ain Shams University | Emary A.A.,Egyptian National Energy Control Center | Yassin K.,Egyptian Electricity Holding Company
International Journal of Electrical Power and Energy Systems | Year: 2012

In this paper, three particle swarm optimization (PSO) based power system stabilizers (PSSs) are developed for three power systems. The system under study here is a power pool consisting of 3 power systems. System I represents the Egyptian power system, system II represents the Jordan and Syrian power systems, and system III for the Libyan power system, which are originally self standing and completely independent systems. As a matter of fact each of them should equipped with its own PSS. For this reason this work is started by designing an optimum power stabilizer for each of them standing alone. After which, the developed PSSs are firstly installed one at a time. Then the three PSSs are installed together in the interconnected power system and their effect on its dynamic performance is studied. As a test for stabilization efficiency, the detailed power system model is subjected to a forced outage of a 600-MW generator, which is the biggest unit in the pool, when it is fully loaded. This outage results in loosing of about 3% of the spinning capacity of system I and about 2% of the spinning capacity of the whole interconnected system. The obtained results show an improvement in the power pool performance accompanied with an improvement in the inter-area oscillation. © 2011 Elsevier Ltd. All rights reserved.

Ahmed N.M.,National Research Center of Egypt | Abdel-Fatah H.T.M.,Egyptian Electricity Holding Company | Youssef E.A.,National Research Center of Egypt
Progress in Organic Coatings | Year: 2012

Core-shell theory presents a new easy route to obtain high performance, and eco-friendly anticorrosive pigments with concomitant savings. This theory is based on depositing a surface layer of expensive efficient anticorrosive pigment on a cheap extender expressing the bulk. The combination of both core and shell compounds led to the production of new pigments with improved properties different from each of its individual components; and consequently these improved properties lead to change in the efficiency of protection properties of paint films containing these new pigments. The objective of the present work is to prepare a new ecologically friendly inorganic pigment, based on the solid-solid interaction of cobalt oxide with zinc oxide on surface of kaolin. The species of CoO and ZnO are susceptible to react with alumina part in the kaolin forming Zn·Co aluminate/kaolin. The new pigment will be incorporated in medium oil alkyd-based paints. The effect of cobalt aluminate/kaolin, zinc aluminate/kaolin individually and zinc·cobalt aluminate/kaolin on the protection performance of paint films containing them will be compared and studied. Another comparison will be held out between films containing nano- and micro-zinc·cobalt aluminate/kaolin to determine the best among the prepared pigments for better corrosion prevention. The comparison will be done using accelerated laboratory test for 28 days in artificial sea water and electrochemical impedance spectroscopy. The results revealed that nano-pigments and pigments containing higher concentration of zinc were the best in protecting steel substrates. © 2011 Elsevier B.V. All rights reserved.

Ahmed N.M.,National Research Center of Egypt | Emira H.S.,National Research Center of Egypt | Tawfik H.M.,Egyptian Electricity Holding Company
Pigment and Resin Technology | Year: 2013

Purpose - Ion-exchange clays containing sodium such as bentonite and montmorillonite have the ability to exchange their cations. Few studies conducted with this type of ion-exchange pigments are not conclusive about their anticorrosive efficiency. The present research aims to address the study on the anticorrosive efficiency of this type of pigments in chlorinated rubber paints. Sodium-bentonite was exchanged with Zn, Sr and Zn-Sr to be applied on low carbon steel specimens and study the anticorrosive performances of these new ion-exchanged bentonites (IEBs) in anticorrosive paint formulations. Design/methodology/approach - The new pigments were characterised using scanning electron microscopy (SEM) and X-ray fluorescence (XRF) to determine the CEC (cation exchange capacity) of the different exchanged cations. Evaluation of the ion-exchanged and Na-bentonite pigments using international standard testing methods (ASTM) was estimated. Paint systems manufactured with these ion-exchange pigments have been subjected to adhesion, accelerated corrosion laboratory tests, and EIS in order to assess their anticorrosive behaviour. Findings - The results of this work revealed that the ion-exchange bentonite (IEBs) pigments showed high anticorrosive performance that can be arranged as follows: Sr-bentonite was better than Zn-Bentonite and both were better than the double Zn-Sr-bentonite indicating an antagonism behaviour between the two cations when present together. Practical implications - These pigments can be applied in other polymer composites, e.g. rubber and plastics as reinforcing agent and fillers. Originality/value - These prepared pigments are environmentally friendly pigments which impart high anticorrosive behaviour to paint films with great economic savings. © 2013 Emerald Group Publishing Limited. All rights reserved.

Abdel-Fatah H.T.M.,Egyptian Electricity Holding Company
Anti-Corrosion Methods and Materials | Year: 2012

Purpose: The purpose of this paper is to carry out laboratory studies of the inhibition effect of tyrosine (Tyr) on the corrosion of low chromium alloy steel (ASTM A213 grade T22) in 7 wt percent sulfamic acid solutions. Design/methodology/approach: The corrosion inhibitive effect of Tyr was investigated using electrochemical impedance spectroscopy (EIS) and the new technique electrochemical frequency modulation (EFM). Findings: It was found that the inhibition efficiency increased with increasing inhibitor concentration, while a decrease was detected with the rise of temperature and stirring speed. The corrosion inhibition is due to physical adsorption of Tyr on the steel surface. Adsorption of the inhibitor molecule, onto the steel surface follows the Temkin's adsorption isotherm. Originality/value: The obtained results from both methods (EIS and EFM) at different experimental conditions were in high agreement and almost similar. This is an indication that the EFM technique can be used efficiently for monitoring the corrosion inhibition under the studied conditions. © Emerald Group Publishing Limited.

Gabr W.I.M.,Egyptian Electricity Holding Company
2010 IEEE International Conference on Information and Automation, ICIA 2010 | Year: 2010

The paper presents further development of the Arithmetic Fuzzy Logic-based Representation using the notion of normalized fuzzy matrices. The investigation is based on the dual cell representation, expressed by replacing each parameter with a pair of parentheses, the first is the actual value and the second is corresponding fuzzy level. The analogy between the proposed Arithmetic Fuzzy Logic-based Representation technique and the Conventional Fuzzy Theory are derived for various cases of operations of addition, subtraction, multiplication and division. It is shown that the suggested approach is identical to that of the Conventional Fuzzy Theory for addition operations and gives average weighted fuzziness interval results of the subtraction operations. Moreover, it yields similar results of multiplication and division operations after ignoring the second order relative variations terms. However, the suggested approach offers additional advantages of linearity, reversibility, simplicity, and applicability. Application of the proposed Arithmetic Fuzzy Logic-based Representation to a Case Study of a fuzzy PERT problem is presented to demonstrate the efficacy of the proposed technique. Finally, it is pointed out that, for similar situations, the solution of the Conventional Fuzzy Theory is very cumbersome and is completely impractical for high dimensional systems. ©2010 IEEE.

Dorrah H.T.,Cairo University | Gabr W.I.M.,Egyptian Electricity Holding Company
2010 IEEE International Conference on Information and Automation, ICIA 2010 | Year: 2010

The paper presents a new approach for the fuzzy modeling and analysis of automatic control systems in fully fuzzy environment. The proposed technique is based on the normalized fuzzy matrices and is an extension of the Arithmetic and Visual Fuzzy Logic-based Representations developed recently by Gabr and Dorrah. The approach is also suitable for determining the propagation of fuzziness in automatic control and dynamical systems where all system coefficients are expressed as fuzzy parameters. It is simply based on the assignment of corresponding fuzzy levels for parameters uncertainty that is made in a heuristic way circumventing the previous difficulties in assuming probabilistic or membership functions. Implementations of the approach are carried out for solving selected automatic control problems with parameters expressed in fully fuzzy environment. These problems cover fuzzy impulse response of systems, fuzzy Routh-Hurwitz stability criteria, fuzzy Controllability and Observability, and the stabilization of inverted pendulum through pole placement technique. The results demonstrated the robustness of the proposed formulation and illustrated in a systematic way how the system parameters fuzziness effect on output results can be effectively tracked for monitoring and control. Finally, it is pointed out that the suggested Arithmetic and Visual Fuzzy Logic-based Representations opens the door for a unified theory for fuzzy modeling, analysis and design of continuous and discrete automatic control systems operating in fully fuzzy environment. ©2010 IEEE.

Farahat M.A.,Zagazig University | Abd Elgawed A.F.,Zagazig University | Mustafa H.M.M.,Egyptian Electricity Holding Company | Ibrahim A.,Zagazig University
International Review on Modelling and Simulations | Year: 2013

Electric power system load forecasting plays an important role in the Energy Management System (EMS), which has great effect on the operation, controlling and planning of electric power system. A precise electric power system short term load forecasting will lead to economic cost saving and right decisions on generating electric power. A short-term load forecasting (STLF) method based on back propagation (BP) neural network which is optimized by particle swarm optimization (PSO) algorithm is presented in this paper. The PSO is used to optimize the initial parameters of the BP neural network, then based on the optimized result, the BP neural network is used for short-term load forecasting. The experiment results show the method in the paper has greater improvement in both accuracy and velocity of convergence for BP neural network. Consequently, the model is practical and effective and provides alternative for forecasting electricity load. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.

Abdel-Fatah H.T.M.,Egyptian Electricity Holding Company
Quality Assurance Journal | Year: 2010

In this study, the implementation of the ISO/IEC 17025 standard in a Transformer Oil Testing Laboratory (TOTL) for performing the Electrical Breakdown Voltage was evaluated. The application of such a QA system involves a great deal of human resources, top management commitment, organizational effort, expertise and expense. Three years of experience of working under the ISO/IEC 17025 compliant quality system is described. The enhanced reliability of the test results, the technical competence of TOTL staff, the increased trust and satisfaction of established customers and the improved reputation of the TOTL are important gains that are attained from the application of the ISO/IEC 17025 standard. Conversely, the drawbacks that resulted from implementing and maintaining the ISO/IEC 17025 QA system were enormous costs, time-consuming efforts, and increased documentation of test procedures. In addition, no new customers or contracts were generated as had been expected. Therefore, the author does not recommend that laboratories pursue ISO/IEC 17025 accreditation unless the requirement is necessitated by customer needs and only when the test for accreditation is entirely appropriate. Moreover, significant benefits covering the costs of establishing, implementation, accreditation and maintaining of this standard should be identified. Copyright © 2011 John Wiley & Sons, Ltd.

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