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Author: search.filters.author.Pattanadech, NorasageSubject: search.filters.subject.depolarization current

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    The Response of Natural Esters when Being Under a Direct Current Electric Field for a Long Time
    (2024-01-01)
    Thungsook, Kittisak
    ;
    Manger, Rene
    ;
    Zink, Markus H.
    ;
    Kobus, Maja
    ;
    Pattanadech, Norasage
    This study examines the dielectric behavior of natural esters exposed to a DC electric field over an extended period of time. The dielectric response was investigated by using polarization and depolarization current measurements. The natural ester sample was subjected to a DC electric field of 0.1 kV/mm, 0.5 kV/mm, 1 kV/mm, 1.5 kV/mm, and 2 kV/mm, respectively. Besides, the moisture content of natural esters was also controlled using a natural method. The test results showed that after being exposed to an electric field for an extended period of time of the natural ester, different forms of charge accumulation might be found partly depending on the initial condition of the investigated natural ester.
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    The Polarization and Depolarization Current Characteristics of Natural Ester Stressed by Partial Discharge
    (2020-10-25)
    Maneerat, Noppadol
    ;
    Makmork, Kawee
    ;
    Kittikhuntharadol, Yannaphol
    ;
    Suksai, Nattapat
    ;
    Chusang, Thanapat
    This paper represents the polarization and depolarization current (PDC) of the natural ester stressed by partial discharge (PD). The needle-plane electrode was used to simulate corona discharge in natural ester. Besides, the needle electrode as a high voltage electrode placed on the 8 hours natural ester impregnated pressboards and the plane electrode as a grounded electrode were used to simulate the surface discharge. To simulate the internal discharge, the plane-plane electrode inserted with various condition impregnated pressboards were experimented. PD phenomena were simulated in the natural ester container for 1, 3, and 6 months. Then the PD-stressed natural ester was used as the liquid specimen for polarization and depolarization current measurement. It was found that the PDC characteristics of natural ester undergone with various PD types were obviously different.