Muhammad Shakir Laili
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Preferred name
Muhammad Shakir Laili
Official Name
Muhammad Shakir, Laili
Alternative Name
Laili, M. S.
Laili, Muhammad S.
Main Affiliation
Scopus Author ID
49561568600
Researcher ID
FFD-4281-2022

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  • Publication
    Intensity ratio distribution in different dielectric liquids using Kerr Effect method
    (IOP Publishing, 2023)
    Zetty Nurazlinda Zakaria
    ;
    Muhammad Shahrul Sanordi
    ;
    Muhammad Shakir Laili
    Light intensity is the result from the Kerr effect measurement that can be used in determining the electric field distributions in dielectric liquids as the analysis continues afterwards. One of the most important parameters to consider in designing the Kerr effect experiment is the Kerr constant of the test liquid. This paper aims to study and compare light intensity distribution in different dielectric liquids using Kerr effect method. Propylene carbonate, transformer oil and purified water are used as the test liquids. From the results obtained, the light intensities as a function of electric field of the test liquids are compared. With higher Kerr constant, low voltages can be applied to the test liquid but with larger optical signals. Furthermore, the length of the electrodes can be designed accordingly to suit the experimental setup.
  • Publication
    Lightning Impulse Voltage Stresses in Underground Cables
    ( 2023-01-01)
    Muhammad Shakir Laili
    ;
    Fen C.M.L.
    ;
    Muzamir Isa
    ;
    Syahrun Nizam Md Arshad @ Hashim
    ;
    Zakaria Z.N.
    Underground power cables are crucial for transmission and distribution. Lightning can stress their insulation, but not directly. So, impulse cable testing is studied. This research examines the cable's transient response to standard and non-standard lightning impulse voltage waveforms. MATLAB Simulink was used to model a 132 kV wire with standard and non-standard impulse voltages. The IEC60060-1(2010) lightning impulse test uses a conventional waveform impulse voltage with a front time and a tail time of 1.2/50μs half value, while the non-standard test uses a front time and a tail time of 0.8/12s half value. Non-standard impulse waveforms are more accurate than standard waveforms. The impulse test voltage is four to five times the underground cable's operational voltage and must withstand five applications without damage. Standard and non-standard impulse waveforms are injected with 132 kV and 550 kV to evaluate insulation failure or damage. Standard lightning and non-standard impulse voltage waveforms do not cause insulation failure or damage. When 132 kV and 550 kV are introduced into the normal and non-standard lightning impulse waveforms, the overshoot voltage increases. The peak voltage of a non-standard 550 kV impulse voltage waveform exceeds the IEC impulse withstand voltage. The finding shows that non-standard impulse voltage waves create increased cable voltage stress.
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