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Author: search.filters.author.Jeenmuang, SiwakornSubject: search.filters.subject.partial discharge

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    The Experiment of Partial Discharge testing for Low Voltage Motor
    (2025-01-01)
    Sawangsri, Jaturaphat
    ;
    Wiangtong, Theerayod
    ;
    Pathanrat, Khomsan
    ;
    Ruangwong, Khomsan
    ;
    Jeenmuang, Siwakorn
    Low-voltage (LV) motors are widely used and highly popular in industrial settings due to their critical role in production processes. Any malfunction or failure of an LV motor can lead to production downtime, resulting in reduced output and potential revenue loss. Therefore, it is essential to conduct diagnostic assessments that evaluate the reliability of the insulation system in LV motors. Partial Discharge (PD) testing is recognized as a highly effective and reliable method for assessing the condition of motor insulation. This paper presents PD testing on LV motors to investigate the behavior of partial discharges using multiple analysis techniques. Additionally, an acoustic camera is integrated into the testing process to accurately identify the discharge locations.
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    The Experiment of Partial Discharge for Cast Resin Transformer
    (2024-01-01)
    Aiamrungruang, Phitthaya
    ;
    Pannil, Pittaya
    ;
    Dorkmai, Kritsada
    ;
    Maneerot, Sakda
    ;
    Jeenmuang, Siwakorn
    Dry-type cast resin transformers, utilizing epoxy resin insulation instead of traditional liquid insulation like mineral oil, are designed to prioritize safety, avoid fire hazards, be environmentally compatible, and endure short circuits well. Limitations of dry-type transformers are the installation area by which it should be dry, free from dust, excessive moisture, fertilizers, chemicals, and other corrosive fumes or fumes. This paper investigates the Partial Discharge (PD) phenomena occurring on a 12 kV dry-type transformer surface using HighFrequency Current Transformers (HFCT) with 100 kHz -20 MHz bandwidth as a PD detection device. The simulated PD sources were made from the conductive wire. Moreover, the scheme of winding connections in the dry-type transformer related to cross-talk phenomena between transformer coils is also reported. The recorded Phase-resolved PD (PRPD) and the PD Inception Voltage (PDIV) have been summarized and compared, as described in this paper.
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    Off-line and On-line Automatic and Unsupervised Partial Discharge Diagnostics of Electrical Asset Components
    (2024-01-01)
    Pattanadech, Norasage
    ;
    Jeenmuang, Siwakorn
    ;
    Udomluksananon, Patt
    ;
    Chumpiboon, Komin
    ;
    Shafiq, Muhammad
    This paper deals with applications of an innovative approach to on-line and off-line partial discharge (PD)-based condition maintenance, where PD detection and analytics are fully automatic and do not require the support of PD experts. PD was measured off-line on a 50 kV A, 22/0.4 kV distribution transformer and on 115 and 230 kV transformer bushings, showing in both cases that PD can be detected and analyzed automatically according to the SID (Separation, Recognition, Identification) procedure. On-line measurements performed on MV generators are also reported and discussed, highlighting that there is potential for on-line MV (and HV) monitoring with automatic and unsupervised noise rejection, and identification of PD phenomena that can feed health assessment software to reach optimized maintenance plans.
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    Partial Discharge Testing on MV Motor - Case Study
    (2023-01-01)
    Jeenmuang, Siwakorn
    ;
    Rojanasunan, Warisanan
    ;
    Dorkmai, Kritsada
    ;
    Chumpiboon, Komin
    ;
    Udomluksananon, Patt
    A failure of a medium voltage (MV) motor during its operation could force an outage of the power plant and also lead to a loss of cost. Hence, the method to ensure the insulation quality of such a motor is needed. Partial discharge (PD) testing is one of the effective methods used to determine the defect and evaluate the integrity of the machine insulation. This paper presents the application of off-line PD testing on MV motors. In the experiment, the PD test instrument conforming to standard IEC 60270 was used as a charge-based measurement. Moreover, during the PD testing, an acoustic imaging camera was employed as an alternative technique for locating the PD sources in the stator winding part. Once PD takes place, it can generate the pressure acoustic wave that propagates surrounding the PD source. Thus, the PD source in the area of endwinding can be located by this technique. From the charge-based PD test results, the phase-resolved PD (PRPD) pattern was considered to identify the type of PD source. It was found that almost MV motors tested have delamination in the bulk insulation. In some cases, the PRPD pattern exhibits the discharge in the area of the overlap region between the semiconductive and stress grading coating in the slot exit, which confirms by using the acoustic technique.
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    The Study of Partial Discharge Test on Service-Aged Cable Termination
    (2023-01-01)
    Laohapongpan, Trinai
    ;
    Wiangtong, Theerayod
    ;
    Kerdmanee, Sittipong
    ;
    Lacharochana, Sakda
    ;
    Jeenmuang, Siwakorn
    This paper presents the partial discharge (PD) testing on the plug-in gas-insulated switchgear cable termination taken out of service. The shield electrodes were designed to geometrically electric field control in the area of the insulation screen edge of the cable part. The PD test of the cable termination was performed. In addition, a computed radiography technique with X-ray was also performed to evaluate the mechanical integrity of the supporting spring of the cable termination. The fatigue of the supporting spring was evidenced. Moreover, the cable termination was disassembled and re-assembled to perform the PD test again. The PD characteristics, including PD magnitude, PD inception voltage (PDIV), and phase-resolved PD (PRPD) patterns, were reported. The PD test results revealed that the PDIV was lower than the operating voltage. Besides, the PRPD patterns exhibited internal discharge inside the cable termination. From the PD test results and computed radiographic, it was assumed that they might be caused by discharge in the interface between the stress cone and epoxy insulator.