Nor Haidar Hashim
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Nor Haidar Hashim
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Nor Haidar, Hashim
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  • Publication
    Performance of Backfill Material for Grounding System under High Voltage Condition
    ( 2022-01-01)
    Nasrul Helmei Halim
    ;
    Syahrun Nizam Md Arshad @ Hashim
    ;
    Nor Haidar Hashim
    ;
    Adzis Z.
    ;
    Isa M.
    ;
    Bakar O.A.
    Grounding (or earthing) play the main role to in order to protect electrical equipment, building and life from lightning, switching and earth fault occurrences. A good grounding system must be able to dissipated this unwanted charge in very fast time and this can be achieved by reducing the grounding resistance. Introduction to backfill material to be filled into grounding pit is widely implemented in order to lowering the resistance of grounding system. This paper investigates the performance of marconite, cement and sand as part of backfill materials for ufer type grounding system under alternating high voltage and impulse voltage condition. The purpose of high impulse voltage experiments is to determine the performance of above said materials under transient condition while the alternating high voltage experiment to observed the behaviour backfill material under leakage or fault current occurrence. The findings reveal that performance of grounding system may significantly change from the expected result at design stages.
  • Publication
    Performance of Restricted Fault and Bias Differential Protection Against Earth Fault on a Transformer
    ( 2022-01-01)
    Nor Haidar Hashim
    ;
    Halim N.H.
    ;
    Syahrun Nizam Md Arshad @ Hashim
    ;
    Hussain M.H.
    ;
    Rahim S.R.A.
    ;
    Suleiman A.A.
    In this paper, the effectiveness of restricted earth fault and bias differential protection against earth fault on of transformer winding is presented. Earth fault is one of the failures that occurs on a power transformer winding. Its magnitude depends on how the neutral is connected and the location of fault. For a transformer which is connected to Neutral Earth Resistance (NER), as the fault moves towards its neutral, the magnitude of fault current decreases and the detection of fault diminishes, thus limiting percentage of winding that can be protected. To overcome this problem, restricted earth fault is employed. This paper will show that based on its principles, restricted earth fault protection is more sensitive and provide better coverage for the star winding against earth fault especially resistance earthed.