Showing papers by "Nursyarizal Mohd Nor published in 2012"

Novel hybrid photovoltaic and thermoelectric panel

Abstract: The aim of this project is to develop a hybrid system to increase efficiency of electricity generation. Two sources of energy are used in this project. One of the energy is solar, that converts radiant light to electrical energy and heat energy which will convert heat to electricity. Photovoltaic (PV) cell and thermoelectric (TE) module is used in this project as tools to capture and convert the energy to electrical energy. This innovation has no emission and requires less maintenance.

Battery characteristics due to various discharging current and temperatures: A simulation approach

Abstract: This paper presents the preliminary simulation study of Lithium-ion batteries. The dynamic model of Li-ion battery was greeted and the battery characteristics were simulated as voltage profiles for two different conditions of initial State of Charge (SOC) and for two different values of discharge current. The usable operating time of the battery ofwas found to vary with SOC initial and discharge current. It was found that the usable run time of the battery increases with increase in SOC initial and decrease in discharge current.

Development of two-axis sun tracking system

Abstract: The volatile fossil fuel price currently creates an opportunity for the development of alternative approaches in electricity generation. Comprehensive and concerted efforts are focused at developing solar electricity generating system (SEGS). One of the challenges faced by SEGS is the apparent trajectory of the sun. Often, SEGS designers use standard testing conditions, whereby the level of solar insolation is taken to be a constant value of 1000W/m2. The only value of solar insolation that is taken to be constant is known as solar constant, which is approximately 1353W/m2. Solar constant is the solar insolation received outside the earth's atmosphere. This value drops significantly as the solar radiation passes through the atmosphere, where the typical range is between 150 W/m2 and 1000W/m2. The reducing intensity of solar insolation is also due to the apparent trajectory of the sun. The sun's path changes daily, and in this project, a novel design of the sun tracker has been tested and is able to do two-axis tracking for photovoltaic based SEGS.

Review of third harmonic current characteristic based diagnostic methods of medium voltage power cable insulation

Abstract: Medium voltage (MV) crosslink polyethylene (XLPE) power cables are extensively utilized in power distribution networks throughout the world. Reliable power delivery depends on the condition of the power cable and distribution system network components. Failure of power cables can cause loss in terms of power outages, capital, and human resources. This is a prime area for research. Degradation of the physical properties of the insulation over time is the usual cause of power cable failure. Factors responsible for XLPE cable degradation include but are not limited to mechanical, electrical and chemical stresses, flaws in manufacturing, and conditions in the environment. The aforesaid degradation factors cause water trees, electrical trees and partial discharge, and finally result into power cable failure. The nonlinear nature of a water tree results in harmonic generation in the AC loss current. The magnitude of the higher harmonics thus generated, depends on the amount of nonlinearity, therefore, amplitude and phase angel of the third harmonic current can be utilized to detect and quantify the degradation level. The main objective of this papers is to present a brief review on methods introduced in literature to utilize the third harmonic current as a diagnostic tool to identify and quantify the power cable degradation.

Development of micro air flow generator for electrical charging system

Abstract: This paper presents the development of micro air flow generator from motorcycle exhaust system. The project is used to utilize the air flow from exhaust in order to generate electrical energy. The kinetic energy from the air flow can be used to turn a turbine. From the turbine shaft, it then will rotate the rotor of a DC motor. The rotation of the rotor having a winding will cut the magnetic field created by the permanent magnet (stator); the electricity then will be produced. This generated electricity is delivered to the rechargeable battery for storage. From the storage, the energy can be used for other purposes such as charging a hand phone. The prototype has been developed and open-circuit and closed-circuit tests have been carried out. The results show that the generator is able to produce electricity and charge electrical appliances such as hand- phone.

The nonlinear dielectric response of water tree degradation in a medium voltage power cable

Abstract: Medium voltage (MV) cross linked polyethylene (XLPE) insulated power cables are being used in electrical power distribution system networks throughout the world. Deterioration like voids, cracks, delimitation, protrusions and contaminants in the cable insulation may initiate water tree, electrical tree and partial discharge. Water treeing is the main cause of insulation failure in MV power cables. The nonlinear dielectric response of water tree generates harmonics in the AC loss current. This paper presents a detailed study of the characterization of XLPE cable insulation. The morphological study of XLPE cable samples has been carried out by using the Scanning Electron Microscope (SEM) and the chemical analysis has been carried out by using Fourier Transform Infrared spectroscopy (FTIR). The MATLAB/SIMULINK program has been used to model and simulate degradation in the power cable due to water tree. This model is simulated with supply frequencies at 50 Hz, 100 Hz and 150 Hz. The 3rd harmonic current has been recorded from the total current flowing through the cable insulation. The generated harmonics have a good relationship with degradation caused by water tree.