Mohd Wafiuddin Yahya
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Preferred name
Mohd Wafiuddin Yahya
Official Name
Mohd Wafiuddin , Yahya
Alternative Name
Yahya, M. W.
Yahya, Mohd Wafiuddin
Main Affiliation
Scopus Author ID
57202610067
Researcher ID
HZG-9288-2023

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  • Publication
    Simulation of three phase induction motor on stationary reference frame
    (Universiti Malaysia Perlis (UniMAP), 2016)
    Mohd Wafiuddin Yahya
    This thesis presents the qdO axis based modeling is proposed to analyze the transient performance of three phase induction motor with the specifications as 0.5Hp, 420V, 50Hz and 4 poles using stationary reference frame. In electrical engineering field, this qdO transformation is used to simplify the analysis of three phase circuit and its application is to reduce the three AC quantities to two DC quantities. This research started with the findings of the parameters of the machines used. There are three main methods are used which are stator DC measurement test to find the value of stator resistance, r1, no-load test to find the value of the magnetizing reactance, Xm and blocked rotor test for the values of rotor resistance, r2, stator and rotor leakage reactance, X 1 and X 2. All data collected and recorded in a table. These methods have been done in the laboratory room. Matlab Simulink package is used to analysis the transient behavior of the three phase induction motor and the sufficient time span is included to study the complete motor's characteristics. The analysis results show the magnitude of phase voltage (V11h) to neutral, phase currents of stator, speed and torque of the machine. The magnitude of v,,. to neutral point of the three phase induction motor is 342.9V. The analysis of the phase voltage also show that phase-b voltage to neutral is lagging phase-a voltage to neutral and the phase-c voltage to neutral is leading the phase-c voltage to neutral. Each lagging and leading is ~n or 120°. For phase stator currents are discussed about the phase-a, phase-b and phase-c in terms of the magnitudes reduce from the high inrush current during the starting up motor until reaching the steady state condition. The magnitude values of the phases current are 1.89A and the time taken is 0.8 seconds when reached the steady state condition. As for the speed of the rotor, it is starting from Opu and time also 0 and increase linearly to the time until reach the steady state value. The speed reach the steady state value at 1.16 pu and the time is 0.8956 seconds. The highest magnitude recorded for the starting torque is 22.92Nm and this value keeps changing until it reaches the steady state value. The steady state value for this torque is 2.37Nm and the time is 0.9653 seconds.
  • Publication
    Development of copper busbar by silver plating under non-linear load operation using finite element method (FEM)
    (AIP Publishing, 2023-04)
    Muhammad Hafiz Ab Aziz
    ;
    Muhammad Mokhzaini Azizan
    ;
    Zaliman Sauli
    ;
    Mohd Wafiuddin Yahya
    Generally, busbars are used in electrical transmission and distribution power. The presence of harmonic current in the busbar will generate more heat to the system. The generation of heat will be increasing power losses at the busbar and reduced their conductivity. A three-dimensional (3D) Finite Element Method (FEM) by COMSOL Multiphysics software was used in this research to analyze the heat distribution, average temperature, and power losses of copper busbar with 0.5 mm silver plating on their surface. The dimension of 30 mm × 4 mm × 500 mm copper busbar was utilized based on their suitable current carrying capacity from the measured location. The current source starts from 419 A and varies from 0% until 50% of Total Harmonic Distortion (THD) with an interval of 5%. The findings show improvement condition of copper busbar after silver plated on their surface. The bare copper busbar only meets the requirement range condition of BS159:1992 until the existence of 15% Total Harmonic Distortion of current (THDi) component while silver-plated copper complies until the maximum value of THDi which is 50%.
  • Publication
    Temperature analysis of single busbar with variation of total harmonic distortion in current
    (Semarak Ilmu Publishing, 2025-11)
    Mohd Wafiuddin Yahya
    ;
    Baharuddin Ismail
    ;
    Afifah Shuhada Rosmi
    ;
    Muhammad Mokhzaini Azizan
    ;
    Chanuri Charin
    ;
    Muhamad Hafiz Ab Aziz
    ;
    Sharulnizam Mohd Mukhtar
    ;
    Yazhar Yatim
    Typically, busbars are used to transmit and distribute currents in a bus duct system. The alarming use of nonlinear loads in the industrial sector or at residentials, such as arc welding, computers, ballast lighting, variable speed drives, and so on, has resulted in the generation of harmonics in current distortion, which are uncontrolled and thus increase heat generation within the system. The research conducted in this paper focuses on the prediction of the heat distribution as well as the analysis on operating temperature of a single busbar with compliance to the British National and International Standard (BS 159: 2014) using the Finite Element Method (FEM) in COMSOL Multiphysics software. The copper busbar dimension used for this research was 20mm x 6mm x 300mm, and the fundamental Root Mean Square (RMS) current was 419.1 A. The size of this busbars can withstand the maximum current of 430 A at a maximum operating temperature of 90°C, which complies with the standard requirement. The fundamental current is injected with variation of total harmonic distortion in current up to 55% with an interval of 5%. According to the findings, the operating temperature increases in direct proportion to the increase in total harmonic distortion with the current injections. With the presence of 55% of total harmonics in the current, the current was increased up to 57.73 A from the fundamental current, while the operating temperature was increased up to 140C from the fundamental temperature. The total harmonics in current produced by the nonlinear loads could affect the operating temperature of the busbars, and this continuous operation of current flow will affect the busbars' lifespan due to the occurrence of overheating.
  • Publication
    Temperature analysis of bus bar by material variation under non-linear load operation
    ( 2024-03-21)
    Aziz M.H.A.
    ;
    Azizan M.M.
    ;
    Zaliman Sauli
    ;
    Mohd Wafiuddin Yahya
    ;
    Wan Mokhdzani Wan Nor Haimi
    Busbars are generally used to transmit and distribute current to a distribution board in buildings. The existence of harmonic current has been known to increase heat generation in the bus duct system. The heat generation commonly causes power losses at the conductor. In this study, a three dimensional (3D) Finite Element Method (FEM) by COMSOL Multiphysics software was utilized for predicting the heat distribution and average temperature for each material and their compliance with BS159:1992 Standard. The dimension of the busbar in this work is 1.5×0.125×20. Current source begins from 410 A and varies from 0% until 50% of Total Harmonic Distortion (THD) with an interval of 5%. The results depict that the temperature varies between each material. Silver demonstrates the lowest operating temperature at an ideal current (0% THDi), and minimum temperature rise after the existence of harmonic component in the current source and iron depicts otherwise result. In Overall, copper proved to be the best material for busbar due to the reasonable price; the low operating temperature at ideal current; and less increment of temperature after the presence of harmonics in the current source.
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