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Wireless Power Transmission Using Microwaves
Nikhil B. Dhake,Arati A. Dandavate
International Journal of Engineering Innovations and Research , 2012,
Abstract: In this paper, we present the concept of wireless power transmission to cut the clutter or lead to clean sources of electricity. It will eradicate the hazardous usage of electrical wires which involve lot of confusion in particularly organizing them. The plan is transmitting power as microwaves from one place to another in order to reduce the use of clumsy wires
Influences of Corrosive Sulfur on Copper Wires and Oil-Paper Insulation in Transformers  [PDF]
Jian Li,Zhiman He,Lianwei Bao,Lijun Yang
Energies , 2011, DOI: 10.3390/en4101563
Abstract: Oil-impregnated paper is widely used in power transmission equipment as a reliable insulation. However, copper sulphide deposition on oil-paper insulation can lead to insulation failures in power transformers. This paper presents the influences of copper sulfur corrosion and copper sulphide deposition on copper wires and oil-paper insulation in power transformers. Thermal aging tests of paper-wrapped copper wires and bare copper wires in insulating oil were carried out at 130 °C and 150 °C in laboratory. The corrosive characteristics of paper-wrapped copper wires and bare copper wires were analyzed. Dielectric properties of insulation paper and insulating oil were also analyzed at different stages of the thermal aging tests using a broadband dielectric spectrometer. Experiments and analysis results show that copper sulfide deposition on surfaces of copper wires and insulation paper changes the surface structures of copper wires and insulation paper. Copper sulfur corrosion changes the dielectric properties of oil-paper insulation, and the copper sulfide deposition greatly reduces the electrical breakdown strength of oil-paper insulation. Metal passivator is capable of preventing copper wires from sulfur corrosion. The experimental results are helpful for investigations for fault diagnosis of internal insulation in power transformers.
Distance Protection Settings Based Artificial Neural Network in Presence of TCSR on Electrical Transmission Line  [cached]
Mohamed Zellagui,Abdelaziz Chaghi
International Journal of Intelligent Systems and Applications , 2012,
Abstract: This research paper study the performance of distance relays setting based analytic (AM) and artificial neural network (ANN) method for a 400 kV high voltage transmission line in Eastern Algerian transmission networks at Sonelgaz Group compensated by series Flexible AC Transmission System (FACTS) i.e. Thyristor Controlled Series Reactor (TCSR) connected at midpoint of the electrical transmission line. The facts are used for controlling transmission voltage, power flow, reactive power, and damping of power system oscillations in high power transfer levels. This paper studies the effects of TCSR insertion on the total impedance of a transmission line protected by distance relay and the modified setting zone protection in capacitive and inductive boost mode for three zones. Two different techniques have been investigated in order to prevent circuit breaker nuisance tripping to improve the performances of the distance relay protection.
Wireless Transmission Network : A Imagine  [PDF]
Neeraj Kr.Garg,Radhey Shyam Meena
International Journal of Scientific Engineering and Technology , 2013,
Abstract: World cannot be imagined without electricalpower. Generally the power is transmitted through transmission networks. This paper describes an original idea to eradicate the hazardous usage of electrical wires which involve lot of confusion in particularly organizing them. Imagine a future in which wireless power transfer is feasible: cell phones, household robots, mp3 players, laptop computers and other portable electronic devices capable of charging themselves without ever being plugged in freeing us from that final ubiquitous power wire. Thispaper includes the techniques of transmitting power without using wires with an efficiency of about 95% with non-radioactivemethods. In this paper wireless power transfer technique have been implemented on test system.Keywords : power, ubiquitous, efficiency
Optimal Power Flow Solution Using Ant Manners for Electrical Network  [cached]
ALLAOUA, B.,LAOUFI, A.
Advances in Electrical and Computer Engineering , 2009,
Abstract: This paper presents ant manners and the collective intelligence for electrical network. Solutions for Optimal Power Flow (OPF) problem of a power system deliberate via an ant colony optimization metaheuristic method. The objective is to minimize the total fuel cost of thermal generating units and also conserve an acceptable system performance in terms of limits on generator real and reactive power outputs, bus voltages, shunt capacitors/reactors, transformers tap-setting and power flow of transmission lines. Simulation results on the IEEE 30-bus electrical network show that the ant colony optimization method converges quickly to the global optimum.
Transfer Capability Enhancement of Transmission Line using Static Synchronous Compensator (STATCOM)  [PDF]
Arti Pateriya,Nitin Saxena ,Manoj Tiwari
International Journal of Advanced Computer Research , 2012,
Abstract: Growth of complex electrical power networks introduces lack of controllability of active and reactive power flow in energies networks Power flow control in an existing long transmission line, plays an important role in power system area. This paper employs the shunt connected compensation STATCOM based FACTS devices for the control of voltage and the power flow in long distance transmission line. The proposed device is used in different locations of transmission line and also deals with determination of the optimal locationof shunt flexible a.c. transmission line (FACTS) devices for a long transmission line for voltage and power transfer improvement. The results also showthe line loading and system initial operating conditions. In this paper the two machine 4-bus test system is simulated using MATLAB Simulink environment.
Electrical Conductance of Molecular Wires  [PDF]
Eldon Emberly,George Kirczenow
Physics , 1999, DOI: 10.1088/0957-4484/10/3/311
Abstract: Molecular wires (MW) are the fundamental building blocks for molecular electronic devices. They consist of a molecular unit connected to two continuum reservoirs of electrons (usually metallic leads). We rely on Landauer theory as the basis for studying the conductance properties of MW systems. This relates the lead to lead current to the transmission probability for an electron to scatter through the molecule. Two different methods have been developed for the study of this scattering. One is based on a solution of the Lippmann-Schwinger equation and the other solves for the {\bf t} matrix using Schroedinger's equation. We use our methodology to study two problems of current interest. The first MW system consists of 1,4 benzene-dithiolate (BDT) bonded to two gold nanocontacts. Our calculations show that the conductance is sensitive to the chemical bonding between the molecule and the leads. The second system we study highlights the interesting phenomenon of antiresonances in MW. We derive an analytic formula predicting at what energies antiresonances should occur in the transmission spectra of MW. A numerical calculation for a MW consisting of filter molecules attached to an active molecule shows the existence of an antiresonance at the energy predicted by our formula.
A Comparative Study of Impact Series FACTS Devices on Distance Relay Setting in 400 kV Transmission Line
ZELLAGUI Mohamed,CHAGHI Abdelaziz
Journal of Electrical and Electronics Engineering , 2012,
Abstract: This research paper presents a comparative study of the performance of distance protection for transmission line 400 kV in Algerian transmission networks at Group Sonelgaz (Algerian Company ofElectricity and Gas) compensated by two different series Flexible Alternative Current Transmission System (FACTS) i.e. GTO Controlled Series Capacitor (GCSC)and Thyristor Controlled Series Capacitor (TCSC) connected at midpoint of an electrical transmission line.The facts are used for controlling transmission voltage, power flow and reactive power in high power transfer levels. This paper studies the effects of angle variation and controlled GCSC and TCSC insertion on the total impedance of a transmission line protected by MHO distance relay. The modified setting zone protection (resistance and reactance) in capacitive and inductive boost mode for three forward zones and one reverse zone are investigated in order to improve the performances of distance protection. The simulationresults are performed in MATLAB software.
Optimal Power Flow of the Algerian Electrical Network using an Ant Colony Optimization Method  [cached]
Tarek BOUKTIR,Linda SLIMANI
Leonardo Journal of Sciences , 2005,
Abstract: This paper presents solution of optimal power flow (OPF) problem of a power system via an Ant Colony Optimization Meta-heuristic method. The objective is to minimize the total fuel cost of thermal generating units and also conserve an acceptable system performance in terms of limits on generator real and reactive power outputs, bus voltages, shunt capacitors/reactors, transformers tap-setting and power flow of transmission lines. Simulation results on the Algerian Electrical Network show that the Ant Colony Optimization method converges quickly to the global optimum.
Optical Transmission Schemes for Focal-plane Data
焦平面数据的光传输方案设计

YAO Jian-min,CHEN Si-ying,YANG Feng-bao,NI Guo-qiang,
姚剑敏
,陈思颖,杨风暴,倪国强

红外 , 2007,
Abstract: To solve the problem that ordinary electrical wires used in dewar can easily lead to the increase of temperature, the optical transmission methods for transmitting the data from a focal plane to the outside of the dewar are studied according to the operation requirements of low temperature, low power consumption, high speed and small volume for cooled focal planes. The application of spatial light modulation and laser transmission methods in optical transmission are discussed, the corresponding schemes are designed and their advantages and shortcomings are pointed out. The experimental results have shown that the spatial light modulation method has the features of high speed and parallel transmission with a data transfer rate of up to 24Gbps, but its structure design is more complicated and higher power consumption is required. The laser transmission is a serial transmission with a data transfer rate of up to 2Gbps. It needs only a power consumption of 100mW and its structure is small and simple. So, the laser transmission method is a more practical data transfer method for cooled focal planes.
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