Suksawat, Dusit

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Suksawat, Dusit
Alternative Name
Suksawat, D.
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Email
dusit.su@kmitl.ac.th

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    Item type:Publication,
    Investigation of Dielectric Response in a 22/0.4 kV Distribution Transformer: Effects of Moisture Content
    (2024-01-01)
    Daengdee, Danaiwat
    ;
    Bunlaksananusorn, Chanin
    ;
    Suksawat, Dusit
    ;
    Chumpiboon, Komin
    ;
    Jeenmuang, Siwakorn
    Transformers play a crucial role in power systems, ensuring efficient energy transmission and distribution. This research focuses on a 22/0.4 kV transformer decommissioned after over 20 years of service. The study involves draining the transformer oil completely and refilling it with oil characterized by known moisture content and breakdown voltage levels until reaching normal operating conditions. The objective is to study the effects of increased moisture content on the dielectric response within the actual structure of the transformer. Diagnostic measurement techniques, including Frequency Domain Spectroscopy (FDS) and Polarization Depolarization Current (PDC), are utilized to evaluate the insulation condition of the transformer. FDS provides information on the dielectric response over a wide frequency range, while PDC assesses the polarization and depolarization behavior of the insulation material. These techniques offer valuable information on the ageing and moisture content of the insulation. The experimental results will be presented and discussed in this paper.
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    The Experiment of VLF Tanδ on Service-aged MV Underground Cable
    (2024-01-01)
    Tangthanam, Worasak
    ;
    Bunlaksananusorn, Chanin
    ;
    Suksawat, Dusit
    ;
    Udomluksananon, Patt
    ;
    Jeenmuang, Siwakorn
    This paper presents the service-aged MV underground cable experiment using very low frequency (VLF) testing. The underground cables in this experiment have been utilized in service for more than 10 years and subjected to TEAM stresses, particularly with moisture, throughout the service time. So, the effect of moisture leads these cables to bad condition. The cables under the experiments are both service-aged and unaged. These cables were prepared the same by peeling both end sides of the cables and were terminated with high voltage insulating tape. The VLF test combined with the tangent delta (tanδ) measurement, according to IEEE Std. 400.2-2013 was performed to assess the condition of these cables and compare them with the unaged cable. The test results revealed that according to IEEE standard 400.2-2013, the service-aged underground cables were assessed in Action Required criteria. Still, the unaged underground cable was assessed in the Further Study Required criteria. Moreover, the tanδ values from service-aged underground cables have significant differences, with service-aged underground cables having higher values than unaged cables. Besides, the variation of tanδ data samples at each test voltage level from some underground cables shows a decreasing trend at 1.0U0 and 1.5U0. Nevertheless, the test voltage at 0.5U0 shows the constant trend of tanδ samples. This analyzed result can indicate that the insulation condition has humidity inside the cable insulation.
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    The Time Domain Dielectric Response of 138 kV and 550 kV OIP Bushing
    (2024-01-01)
    Yamsiri, Thummanoon
    ;
    Bunlaksananusorn, Chanin
    ;
    Suksawat, Dusit
    ;
    Rojanasunan, Warisanan
    ;
    Jeenmuang, Siwakorn
    In this paper the dielectric response in time domain which is polarization and depolarization current (PDC) measurement is applied to assess the global condition of OIP bushings. The bushings in this paper are five 138 kV OIP bushings and three 550 kV OIP bushings which are out of service already. From the PDC results, capacitance and current trends of both voltage levels were investigated individually. PDC results in this paper can be useful data for further analysis and diagnostic.