Improving Circuit Breaker Maintenance Management Tasks By Applying Mobile Agent Software Technology

Improving Circuit Breaker Maintenance Management Tasks By Applying Mobile Agent Software Technology

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION Circuit breakers play a crucial role in switching for the reasons of both the routine network operation and protection of other devices in power systems. To ensure circuit breakers are in healthy condition, periodical inspection and preventive maintenance are typically performed. The maintenance schedules and routines usually follow the recommendation of circuit breaker vendors, although the recommended schedules may be conservative.New maintenance techniques and methodologies are emerging, while the circuit breakers keep improving in their designs and functions. As an example, some new circuit breakers have embedded monitoring instruments available to measure the coil current profiles and the operation timing. The recorded information can be used to monitor the condition of breakers during each operation. In this case, it may be more appropriate to replace the time directed maintenance…
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Large Scale Power Generation Using Fuel Cell

Large Scale Power Generation Using Fuel Cell

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION A fuel cell is an electrochemical device that converts the chemical energy of Fuel directly into electrical energy. Intermediate conversions of the fuel to thermal and mechanical energy are not required. All fuel cells consist of two electrodes (anode and cathode) and an electrolyte (usually retained in a matrix). They operate much like a battery except that the reactants (and products)are not stored, but continuously fed to the cell.Fuel cells were first invented in 1839, but the technology largely remained dormant until the late 1950s. During the 1960s, NASA used precursors to today’s fuel cell technology as power sources in spacecraft.Figure 1 shows the flows and reactions in a simple fuel cell. Unlike ordinary combustion, fuel (hydrogen-rich) and oxidant (typically air) are delivered to the fuel cell separately. The…
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Design And Development Of Microcontroller Based Mppt And Inverter For Small Power Applications

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION In the present world of increasing demand for energy resources, it is crucial to come up with innovatory ideas to reduce and conserve usage of energy. The word Photovoltaic is a combination of the Greek word for Light and the name of the physicist Volta. It identifies the direct conversion of sunlight into energy by means of solar cells [1].Though the utilization of solar energy is little at present, it is going to double in upcoming days, even though it today this type of energy is not widely used as other available resources like thermal, wind, or hydroelectric. Solar power has many advantages over other nonrenewable energy sources. It has even advantages over renewable energy sources like wind and water. However the drawback here is that it produces energy…
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Protection Of Transmission System Using Global Positioning System

Protection Of Transmission System Using Global Positioning System

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION An electric power system comprises of generation, transmission and distribution of electric energy. Transmission lines are used to transmit electric power to distant large load centres. The rapid growth of electric power systems over the past few decades has resulted in a large increase of the number of lines in operation and their total length. These lines are exposed to faults as a result of lightning, short circuits, faulty equipments, misoperation, human errors, overload, and aging. Many electrical faults manifest in mechanical damages, which must be repaired before returning the line to service. The restoration can be expedited if the fault location is either known or can be estimated with a reasonable accuracy. Faults cause short to long term power outages for customers and may lead to significant losses…
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Dc Circuit Breaker Using Superconductor For Current Limiting

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION HVDC transmission systems are widely applied to large- capacity and long-distance power transmission in recent power systems. They are also one of the key technologies to utilize remote renewable resources such as offshore wind power and large-scale solar power . As highlighted previously, the development o f a fast dc breaker capable of rapidly interrupting high dc fault currents can make dc grids a reality. It is anticipated that the interrupting time will need to be 5ms or less to protect the converter equipment from damage . Up to now, there are many different types of dc circuit break- ers (DCCBs) in the world being developed by manufacturers or in the research community. Around 1985, ABB developed a 500-kV air-blast HVdc circuit breaker (CB) using the self- oscillation method,…
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Power Factor Correction Using Pic Microcontroller

Power Factor Correction Using Pic Microcontroller

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION In the present scenario of technological revolution it has been observed that the power is very precious. Majority of the loads in the industries are highly inductive in nature such as induction motors, AC/DC drives, welding machines, arc furnaces, fluorescent Lightings, electronic controls and computers. There may be a few resistive loads for heaters and incandescent bulbs. Very rarely industries may have capacitive loads such as synchronous motors. Net industrial load is highly inductive causing a very poor lagging power factor. If this poor power factor is left uncorrected, the industry will require a high maximum demand from Electricity Board and also will suffer a penalty for poor power factor. Standard practice is to connect power capacitors in the power system at appropriate places to compensate the inductive nature…
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Data Transmission Through Powerlines

Data Transmission Through Powerlines

Electrical & Electronics Engineering, Electronics & Communication Engineering
INTRODUCTION The power line modem uses the power line cable as communication medium. It is convenient as it eliminates the need to lay additional cables however the traditionally used channels have come to a saturation level. There is need to explore new kind of technology which is simpler to implement and is not as expensive as other related technologies.This can be implemented in small areas such as residences, offices, etc. Various kind of devices can be controlled remotely. The main benefit of this system is simplicity of automation of their house. Another major factor is the ubiquity of the medium - power outlets are commonly found and available throughout the house or the office and may very well serve as communication nodes. The external electrical grid can also be used…
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A Bridgless Boost Rectifier For Low-Voltage Energy Harvesting Applications

Electrical & Electronics Engineering, Electronics & Communication Engineering
                    INTRODUCTION A general diagram of an electromagnetic generator is demonstrated in Fig. 1, where k is spring stiffness constant; m is the proof-mass; DE and DP represent electrical and parasitic dampers, respectively. Essentially, the energy harvesting system consists of a spring, a proof mass, and an electrical damper. The extrinsic vibrations excite the internal oscillation between the proof mass (magnet) and electrical damper (coils). The internal oscillation produces a periodically variable magnetic flux in the coil, which induces a corresponding alternating output voltage. In energy harvesting systems, power electronic circuit forms the key interface between transducer and electronic load, which might include a battery. The electrical and physical characteristics of the power conditioning interfaces determine the functionality, efficiency, and the…
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Solar Wpt Using Inductive Coupling For Mobile Charger

Solar Wpt Using Inductive Coupling For Mobile Charger

Electrical & Electronics Engineering, Electronics & Communication Engineering, Uncategorized
INTRODUCTION In recent years, there has been increasing interest in research and development of wireless power technology to eliminate the “last cable” after Wi-Fi becomes widely accepted. Imagine sitting down for a cup of coffee, and placing your mobile phone on the table. The phone lights up, and starts to automatically charge without connectors or cables. You could simply grab your mobile phone on your way out in the morning, and charge it wherever you needed to at home, the office, the library, the local coffee shop. It would be even better if you did not ever need a charger. We could simply forget about USB cables, chargers and, when traveling, adapters. Inductive power transfer is being used in numerous applications for transferring power wirelessly. Wireless energy transmission is the…
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Stabilization Of Electrodynamic Tethers

Stabilization Of Electrodynamic Tethers

Electrical & Electronics Engineering, Electronics & Communication Engineering
               INTRODUCTION Electrodynamic tethers have strong potential for providing propellantless propulsion to spacecraft in low-Earth orbit for applications such as satellite deorbit (Forward, 1998) orbit boosting, and station keeping (Johnson, 1998). Unfortunately, however, electrodynamic tethers are inherently unstable (Beletskii, 1993, Levin 1987, Pelaez, 2000) When a tether in orbit carries a current along its length, the interaction of the tether with the geomagnetic field creates a force on the tether that is directed perpendicular to the tether. The summation of this force along the length of the tether can produce a net pro pulsive force on the tether system, raising or lowering its orbit. The tether, however, is not a rigid rod held above or below the spacecraft. It is a very long, thin…
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