Haziah Abdul Hamid
Thumbnail Image
Preferred name
Haziah Abdul Hamid
Official Name
Abdul Hamid, Haziah
Alternative Name
Hamid, Haziah
Hamid, H.
Hamid, H. A
Abdul Hamid, H.
Hamid, Haziah Abdul
Hamid, Haziah Binti Abd
Main Affiliation
Scopus Author ID
57213599593
Researcher ID
HLX-4281-2023

Research Output

Filters

17
Reset filters

Settings
Now showing 1 - 10 of 17
  • Publication
    Optimum sizing of photovoltaic powered uninterruptible power supply system
    ( 2017-10-01)
    Mahrizal Masri
    ;
    Muhammad Irwanto Misrun
    ;
    Hermansyah Alam
    ;
    Haziah Abdul Hamid
    ;
    Butar-Butar A.H.
    Inverters installed in the photovoltaic (PV) powered uninterruptible power supply (UPS) system consist of battery and also PV module. An optimum number of PV module and battery should be considered to reduce costs and technical works. The PV powered UPS system is operated directly by the PV module, therefore, an optimization sizing of PV powered UPS system should be studied in terms of optimum PV module number that related to the power capacity of PV powered UPS system, solar radiation and temperature. This paper presents an optimum sizing of PV powered UPS system application. A mathematical modeling is created to obtain the optimum number of PV module and battery. The result shows that for 12V, 100W PV powered UPS system applying the 60W, 21V PV module, 12V, 100Ah battery, 700W AC load power, thus, the optimum number of PV module and battery are 20 modules and 5 pieces, respectively.
  • Publication
    Simulation of magnetic field density in solenoid generated by current of photovoltaic module based on solar irradiance and temperature
    ( 2017-10-01)
    Butar-Butar A.H.
    ;
    Leong J.H.
    ;
    Muhammad Irwanto Misrun
    ;
    Haziah Abdul Hamid
    ;
    Mahrizal Masri
    ;
    Hermansyah Alam
    Normally, the magnetic field density in a solenoid is generated by a constant DC current source. A photovoltaic (PV) module is also a DC current source. The output current of PV module depends on the solar irradiance and temperature. The PV module generates a higher current on the constant temperature and higher solar irradiance. Inversely, it generates a lower current on the constant temperature and lower solar irradiance. Thus, it is important to study the output current of PV module related to the magnetic field in a solenoid. The daily data of solar irradiance and temperature are recorded by Vantage Weather Station Pro2 in Universiti Malaysia Perlis (UniMAP) throughout the year 2015. The performance of PV module (maximum peak point current) is simulated using PSpice software. The daily maximum peak point current of PV module is applied into a formulation of magnetic field density to obtain the daily maximum magnetic field density generated in a solenoid. The result shows that the higher maximum peak point current generated by PV module will produce the higher magnetic field density in a solenoid.
  • Publication
    Analysis of an AC voltage waveform on changeover of transfer switch on photovoltaic powered uninterruptible power supply system
    ( 2017-10-01)
    Hermansyah Alam
    ;
    Muhammad Irwanto Misrun
    ;
    Mahrizal Masri
    ;
    Haziah Abdul Hamid
    ;
    Butar-Butar A.H.
    Normally, an uninterruptible power supply (UPS) system supplies to AC lands if the national utility grid fails to supply AC source to the AC loads. The UPS system stands on the national utility grid. It means that it can be operated only in the area or near the national utility grid.
      14  1
  • Publication
    Two-terminal fault detection and location for hybrid transmission circuit
    ( 2021-08-01)
    Muhd Hafizi Idris
    ;
    Mohd Rafi Adzman
    ;
    Mokhlis H.
    ;
    Mohammad Faridun Naim Tajuddin
    ;
    Haziah Abdul Hamid
    ;
    Melaty Amirruddin
    This paper presents the algorithms developed to detect and locate the faults at a hybrid circuit. First, the fault detection algorithm was developed using the comparison of total positive-sequence fault current between pre-fault and fault times to detect the occurrence of a fault. Then, the voltage check method was used to decide whether the fault occurred at overhead line (OHL) or cable section. Finally, the fault location algorithm using the impedance-based method and negative-sequence measurements from both terminals of the circuit were used to estimate the fault point from local terminal. From the tests of various fault conditions including different fault types, fault resistance and fault locations, the proposed method successfully detected all fault cases at around 1 cycle from fault initiation and with correct faulted section identification. Besides that, the fault location algorithm also has very accurate results of fault estimation with average error less than 1 km and 1%.
      10  23
  • Publication
    Investigation of Spherical Electrode Grounding System under High Impulse Conditions with Different Polarities
    ( 2021-06-11)
    Haziah Abdul Hamid
    ;
    Mohd Rafi Adzman
    ;
    Noor Hasnizam Hanafi
    ;
    Nor N.M.
    ;
    Abdullah S.
    ;
    Reffin M.S.
    ;
    Etobi N.A.
    ;
    Abd-Rahman R.
    There have been many studies in the pasts, which showed that under high impulse conditions, soil ionization process around the electrode would occur, which results in lower resistance and lower transient voltage on the electrode. Several factors have also been found to affect the ionization process in soil such as; soil types and its grain sizes, moisture contents in the soil, earth electrode configurations, impulse polarity, the location of the injection point, the shape of response time, etc. In this paper, spherical electrodes grounding is used to study the ionization process in the grounding system under different impulse polarity of the current. The experiment was done by field measurement using a commercially available impulse current generator. It was found that lower earth resistance was seen to decrease with increasing current magnitudes for both impulse polarities. In addition, it was found that at low impulse current with negative polarity has a higher resistance than that of positive polarity. This paper is, therefore, to investigate towards improvement on grounding electrode's design, which would consider soil ionization process
      3  3
  • Publication
    Analysis of AC voltage and current waveform distortion on SPWM transformerless photovoltaic inverter
    ( 2017-10-01)
    Muhammad Irwanto Misrun
    ;
    Hermansyah Alam
    ;
    Mohd Yusoff Mashor
    ;
    Mahrizal Masri
    ;
    Haziah Abdul Hamid
    ;
    Baharuddin Ismail
    ;
    Butar-Butar A.H.
    Normally, the low frequency (50Hz) inverter uses a transformer that is bigger in size, heavy and expensive. For reducing the size, weight and manufacturing cost, the SPWM TPVI is suitable, it can generate a sinusoidal AC waveform which is suitable for the long life of AC loads. This paper presents an analysis of AC voltage and current waveform distortion on sinusoidal pulse width modulation (SPWM) transformerless photovoltaic inverter (TPVI). The sinusoidal waveform is developed based on the SPWM technique by installing an LC filter at the end terminal of full bridge inverter. It is due to no optimum value of LC components and AC load, whereas the AC voltage and current waveform will be distorted. Thus, it is very important to analyze the distortion of AC voltage and current waveform.
      4  24
  • Publication
    Flashover voltage prediction on polluted cup-pin the insulators under polluted conditions
    ( 2021-01-01)
    Salem A.A.
    ;
    Abd-Rahman R.
    ;
    Kamarudin M.S.
    ;
    Othman N.A.
    ;
    Jamail N.A.M.
    ;
    Nuriziani Hussin
    ;
    Haziah Abdul Hamid
    ;
    Rawi I.M.
    The natural pollution which is mainly affected by the weather conditions are the main cause of flashovers on high voltage insulators leading to outages in power systems. In this work, characteristics of flashover for contaminated cup-pin insulators have been studied based on experiential test and a mathematical model. Information from laboratory test combined with new mathematical model results are used to define Artificial Neural Network (ANN) algorithm and Adaptive Neuro-fuzzy Inference System (ANFIS) for calculated the flashover characteristics (current IF and voltage UF). several of experiments and measurement are carried out for 1:1, 5:1, 10:1 and 15:1 ratios of bottom to top surface salt deposit density on contaminated samples (z). Dimensional Analysis Method (DAM) was used to derive new model for the variables which often effective in the flashover phenomenon of polluted insulators. The model was derived by establishment the relationship between flashover voltage UF and current IF, length of pollution layer LP, exposure time t, arc constant A and layer pollution conductivity of insulator σ. The both arc constants A and n is computed using genetic algorithm. Comparative investigates have clearly shown that the approach AI-based method gives the agreeable results compared to the mathematical model.
      6  2
  • Publication
    The study of photovoltaic systems performance using various azimuth angles and solar array tilt positions
    ( 2020-01-07)
    Banu Poobalan
    ;
    Haziah Abdul Hamid
    ;
    Noor Hasnizam Hanafi
    ;
    Wooi Chin Leong
    The study of photovoltaic energy and load predictions have become essential with the increase of energy demand. The objective of this paper is to present an analytical study on the performance of photovoltaic system with various azimuth angles and solar array tilt positions. The output power of a solar module is mainly dependent on its tilt position, solar irradiation, type of solar cell, and the technical properties of the module. The data used in this work consist of two different locations. The outcome of this work shows that the energy production influenced heavily on the weather conditions, location, azimuth angles and tilt positions. Within this work, parameters such as planes-of-array irradiance, net to inverter output power, net to grid output power and performance ratio have been studied. The developed analytical study is anticipated to provide a better understanding on the energy production and load usage in accordance with suitable tilt angle of solar array in a specific location.
      2  20
  • Publication
    Development and Performance Analysis of the Rogowski coil sensor for Arcing Fault Measurement
    ( 2020-03-20)
    Ayob Nazmy Nanyan
    ;
    Muzamir Isa
    ;
    Mohamad Nur Khairul Hafizi Rohani
    ;
    Haziah Abdul Hamid
    ;
    Afifah Shuhada Rosmi
    ;
    Mardianaliza Othman
    ;
    Ahmad Zaidi Abdullah
    ;
    Zamri Che Mat Kasa
    ;
    Ami Nurul Nazifah Abdullah
    Arcing fault is an overvoltage that usually occurs in the power system network, and it is necessary to monitor this phenomenon in electrical equipment. This paper presents the Rogowski coil (RC) as an arcing fault sensor. Finite element method (FEM) software used for analysing the RC magnetic flux density with two types of RC with the different turns and size demonstrated. The sizing of RC based on the 240 mm2 cross-link polyethene (XLPE) 11 kV underground cable. The prototypes of the RC sensors were designed using Solidworks software and three-dimensional (3D) printer for fabrication purposes. The main objective of the experiment is to investigate the RC effect with high magnetic flux density by implementing in real measurement. An experimental setup for real arcing fault with various voltages (up to 15 kV) was conducted to verify the RC performance, such as sensitivity and bandwidth range. The result has shown that the bandwidth of RC 1 is higher than RC 2 in all measurement by 22.6%.
      6  3
  • Publication
    The magnetic flux density of various geometries of Rogowski Coil for overvoltage measurements
    ( 2020-01-01)
    Ayob Nazmy Nanyan
    ;
    Mohamad Nur Khairul Hafizi Rohani
    ;
    Muzamir Isa
    ;
    Afifah Shuhada Rosmi
    ;
    Ahmad Zaidi Abdullah
    ;
    Baharuddin Ismail
    ;
    Haziah Abdul Hamid
    Overvoltage phenomenon is the common problem that always occurs in the power system and can cause the electrical system network breakdown, and in some cases, it may explode. The frequent overvoltage also can affect and degrade the lifespan of the electrical power system components and network. Thus, the overvoltage sensor is needed to overcome this problem matter. The Rogowski coil (RC) is one of an inductive coil group, and it is suitable for measuring the alternating current (AC) and transient currents or overvoltage. This paper demonstrated the effect of RC magnetic flux density, B with difference cross-section, geometries sizing and the number of turns by using Finite Element Method (FEM). Commonly, there are three types of RC widely used; rectangular, circular and oval. Each of these cross-sections has different characteristics in term of performance. The results have shown that the rectangular cross-section is better than oval and circular cross-section based on the number of magnetic flux density.
      18  6