Kunakorn, Anantawat

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Kunakorn, Anantawat
Alternative Name
Kunakorn, A.
Kunakorn, Anatawat
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Email
anantawat.ku@kmitl.ac.th

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    Item type:Publication,
    Transient equivalent circuit of a horizontal grounding electrode
    (2012-12-31)
    Yutthagowith, P.
    ;
    Kunakorn, A.
    ;
    Potivejkul, S.
    ;
    Chaisiri, P.
    This paper proposes an equivalent circuit of grounding electrode which has validity upto a frequency range of sub-sequence stroke lightning current. The equivalent circuit is modelled by lumped and distributed parameters based on quasistatic assumption. In this study, only a grounding electrode installed horizontally is in consideration. The limitation of the uniform distributed equivalent circuit of a grounding electrode is presented. The non-uniform distributed equivalent circuit is proposed. The proposed equivalent circuits are verified by comparison of the results of ground potential rise computed by the proposed circuit, the partial element equivalent circuit method, and available experimental data. The proposed equivalent circuit can be adapted for being the models for development and design of the grounding system for lightning protection system in transmission and distribution systems in an effective way. © 2012 IEEE.
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    Internal failure analysis of transformer windings
    (2012-12-31)
    Tuethong, P.
    ;
    Yutthagowith, P.
    ;
    Kunakorn, A.
    ;
    Potivejkul, S.
    This paper presents internal failure analysis of transformer windings based on the characteristic of winding impedance in the frequency domain. Two winding samples are selected to test. The simple equivalent circuit of the transformer winding is investigated and proposed. The two windings under test have 76 turns with different length. An iron core is either inserted or not inserted inside a winding in the test to investigate the effect of the iron core. Turn to turn short circuit on the windings is considered as internal failure in this paper. The simulated turn to turn short on the model is carried out in the experiment to observe impedance characteristic in the frequency domain. A number and position of short turns are varied to observe characteristics of impedances The impedance of the models of the transformer windings are measured by a spectrum analyzer in a wide frequency range upto 2 MHz. From the test results, it is investigated that a resonance frequency of the transformer model is depended on a number and position of short turns. From the investigation, it has high possibility that the characteristic can be used for analysis of internal failures occurring in a transformer. © 2012 IEEE.
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