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Subject: search.filters.subject.Partial Discharge (PD)

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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.
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    The Effects of Coupling and Grounding on the Partial Discharge Pulse Propagation in the Underground Cable
    (2022-01-01)
    Rojanasunan, W.
    ;
    Chancharoensook, P.
    ;
    Jeenmuang, S.
    ;
    Mongkolsatitpong, S.
    ;
    Pattanadech, N.
    When a Partial Discharge (PD) pulse propagates through a cross-bonded (CB) power cable system, such pulse undergoes attenuation and dispersion along a cable. Moreover, the coupling effect occurs when a PD pulse propagates in HV cable joints and CB link lines. This paper aims to study the effects of coupling phenomena and groundings on the PD pulse propagation. The experiments were divided into 3 parts: the experiment for attenuation in the conductor and ground wire, the experiment for coupling effect, and the experiment for different grounding configuration. The experimental setups used a 30 m length of new 33 kV XLPE insulated cable. PD pulses was obtained from a PD calibrator, and the pulses are detected by Radio Frequency Current Transformer at various positions. The knowledge gained from this research should be useful for a deep understanding of pulse propagation and PD source localization in CB power cable systems.