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Author: search.filters.author.Dechothamsathit, Vorawut

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    Item type:Publication,
    Development of a Health Index for Transformer Condition Assessment Using an Online Dashboard
    (2025-01-01)
    Sripatawasumadee, Kornchet
    ;
    Maneerat, Noppadol
    ;
    Dechothamsathit, Vorawut
    ;
    Kingkham, Sukanya
    ;
    Jeenmuang, Siwakorn
    Power transformers are critical components in electrical power systems in the transmission and distribution of electricity. Keeping them in good working condition is necessary to prevent power outages and ensure system stability. Traditional maintenance strategies, such as time-based maintenance, may not always be the best way to avoid problems or use resources efficiently. To improve this, the concept of a Health Index (HI) has been introduced as a systematic method for transformer condition assessment. By integrating various diagnostic data - such as load data, oil analysis, maintenance record, and on-load tap changer (OLTC) parts - into a unified HI score, asset managers can make informed decisions regarding maintenance prioritization and replacement planning. Furthermore, this paper proposes the development of an online dashboard system that facilitates the input, storage, and visualization of transformer health data. This user-friendly platform enables engineers to monitor condition trends in real time and supports strategic maintenance scheduling. The integration of Health Index evaluation with an accessible digital interface enhances the efficiency, transparency, and reliability of transformer asset management practices.
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    Partial Discharge Investigation of 22kV Distribution Transformer
    (2024-01-01)
    Dechothamsathit, Vorawut
    ;
    Pannil, Pittaya
    ;
    Yamsiri, Thummanoon
    ;
    Chumpiboon, Komin
    ;
    Jeenmuang, Siwakorn
    This paper presents an off-line partial discharge (PD) experiment conducted on a 22 kV/400 V distribution transformer, which was decommissioned after 20 years of service. The study investigates the impact of reduced oil levels within the transformer on PD characteristics that are expected to facilitate PD activity within the transformer. The experiments were performed with reduced oil levels below the top clamp and using both single-phase and three-phase voltage excitations, with PD measurements recorded for each case. The PD signals were measured using High-Frequency Current Transformers (HFCTs) and capturing current pulses of PD in the frequency range of 100 kHz to 20 MHz. Additionally, transformer oil tests were performed, including moisture content, oil breakdown voltage, and oil conductivity. The results of the PD measurements and oil tests are introduced and discussed in this paper.