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    The Effect of Insulating Oil Conditions in Transformer Bushing on Dielectric Response Analysis
    (2024-01-01)
    Srisub, Chanatip
    ;
    Maneerat, Noppadol
    ;
    Rojanasunan, Warisanan
    ;
    Buranaaudsawakul, Techatat
    ;
    Pannil, Pittaya
    The bushing is one of the important parts of a transformer. Once the transformer is operated; each transformer part including its bushing starts the degradation mechanism. In some cases, the dielectric strength degradation of the bushing can lead to severe consequences. Thus, the study and diagnosis of the bushing conditions are important. This study aims to investigate the characteristics of the oil-impregnated pressboard bushing under various oil conditions by filling the new mineral oil with a controlled moisture content and letting it reach an equilibrium state to examine the dielectric response of such bushing. To determine the dielectric characteristics of the investigated bushing, A Frequency Domain Spectroscopy (FDS) device was utilized. In the experiment, the dissipation factor, capacitance, and current measurement of the bushing with different water content level were measured. The bushing test object was tested with the frequency range of 1 mHz -1 kHz. The effect of moisture clearly influenced the low-frequency ranges of the FDS. The result will be discussed in the paper.
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    Improvement of Lightning Conductors to Prevent Creeping Discharge
    (2024-01-01)
    Sirachansawang, Pathorn
    ;
    Phommeepun, Surachai
    ;
    Tangtheerajaroonwong, Wiroj
    ;
    Buranaaudsawakul, Techatat
    ;
    Apiratikul, Promsak
    This research is a test of a lightning conductor that can prevent or reduce the distance from lightning current jumps between the lightning conductor and nearby metal. The lightning conductor must have durable insulation to protect against lightning current jumps to a certain extent. But if the separation distance (s) cannot be maintained, the potential must be coordinated with the lightning conductor to prevent the occurrence of metal arcs. This research will test the ability to protect the separation distance, s = 50 cm. A copper lightning conductor has a cross-sectional area of 50 sq.mm. and the thickness of the electrical insulation is an important part in protecting against a voltage of 600. kV. If there is no insulation to protect the voltage at 600 kV, the ability to jump the lightning current will be at a distance of 50 m. The KHV cable is important for intelligent buildings that have lightning protection systems. It can isolate electrical and electronic equipment and external lightning protection.
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    Partial Discharge Characteristics of MV Switchgear Using TEV and HFCT Sensors
    (2024-01-01)
    Kingkham, Sukanya
    ;
    Smerpitak, Krit
    ;
    Inwanna, Woranan
    ;
    Jeenmuang, Siwakorn
    ;
    Buranaaudsawakul, Techatat
    This paper presents partial discharge (PD) experiments for a medium voltage (MV) switchgear. Various types of defects were simulated i.e., corona discharge, surface discharge, and floating discharge inside the simulated MV switchgear. The transient earth voltage (TEV) was employed as a PD sensor to acquire the PD signals generated by the simulated PD defects. The TEV sensors were installed on the simulated metal enclosures MV switchgear to detect electromagnetic (EM) pulse radiated through such metal housing. Besides, high-frequency current transformer (HFCT) sensors were also used for a purpose similar to that of a TEV. Based on laboratory test results, it was found that when the external structural material and internal partition wall of the MV switchgear have greater insulation properties, some of the PD signals detected by the TEV sensor tend to exhibit a significant decrease in signal magnitude. The detected PD results of the simulating PD sources inside the MV switchgear will be presented in this paper. Moreover, the field test PD experiment for the MV switch gear is also reported.