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June 2013

Volume: 14, Issue: 2, June 2013

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Real-Time Detection of Interruptions and Associated Equipments in Electric Power Distribution Substations in Nigeria

Author: Oyetunji S.A.

Abstract:

Real-time detection of interruption and affected equipment in electric power distribution system in Nigeria is repositioned to overcome the challenges posed by non-ability to detect outages in distribution substations whenever protective devices operate. This research initiative was undertaken to develop indigenous real-time detection of outages using current signature analysis. Software driven hardware positioned at remotely located sub-station monitors the state of the network in real-time. It analyzes the results and initiates communication with the Distribution Control Center (DCC) whenever outages conditions occur for analysis and diagnosis. Additionally, it generates a restoration code whenever corrective measures initiated are successful. The response of the installed sensors was analyzed at the DCC to determine the affected equipment. The resultant system limits the effects of unplanned outages and increases power availability by reducing the down time. The system not only provides network wide status and health monitoring, but also strengthen engineering and management capabilities.

(pp. 753-764)                    Download PDF

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Hybrid Ge-Si Based MOSFET Devices

Authors: Gopi.B, Poornima.M and Priya.G

Abstract:

A numerical study on MOSFET with two substrate materials has been investigated in this paper. The objective of this study is to reduce the drain current value by using two equal amounts of different substrate materials. In this study the transfer characteristics of basic and hybrid MOSFET are analyzed. The outcome of this study is to analyze the performance of the hybrid MOSFET.

(pp. 765-767)                    Download PDF

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Improvement of Voltage Stability Index & Reduction of Power Losses by Optimal Placements of Static VAR Compensator using PSO

Authors: M.V.Ramesh, M.Tech, Dr. V.C. Veera Reddy

Abstract:

The existing transmission lines mismatch with increasing power demand. Hence, a small disturbance can lead to power system collapse when it is operating under stressed condition. This can be avoided by using different techniques such as the optimal placements of FACTS devices. In this paper, optimal ratings of SVCs are placed at each bus using PSO. The voltage stability index is considered as a criterion to place SVCs in normal & contingency conditions. The simulations are done on an IEEE 30 bus power system and results are presented.

(pp. 768-771)                    Download PDF

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Passive Infrared (PIR) Sensor Based Security System

Authors: Pema Chodon, Devi Maya Adhikari, Gopal Chandra Nepal, Rajen Biswa, Sangay Gyeltshen, Chencho

Abstract:

In this paper, a PIR based security system which saves the power consumption and the memory space of the recording system has been proposed. Passive Infrared Radiation (PIR) sensor detects the change in infrared radiation of warm blooded moving object in its detection range. According to the change in infrared radiation, there will be a change in the voltages generated which was amplified and used to turn ON the webcam and lighting system through relay. Software was developed and installed in the computer to capture and record the video when the webcam gets turned ON. When an intruder comes in the detection range of the PIR sensor, it actuates the lighting system and the webcam. The software detects the webcam connection; it will start to record and save the video. Once the intruder moves out of detection range of the sensor, the webcam and light gets turn OFF. The software repeats the process. Thus the saves power consumption and the memory space of the recording system as the lamp and webcam will only get turned ON when PIR sensors detects an object. Consequently the system starts recording only when the webcam is turned ON; hence saving memory space.

(pp. 772-776)                    Download PDF