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Author: search.filters.author.Boonsathitthavorn, S.Has files: No

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    Dielectric properties of stator coil insulation of medium voltage motor
    (2019-07-01)
    Pattanadech, N.
    ;
    Boonsathitthavorn, S.
    ;
    Phumipunepon, N.
    One of the non-destructive methods commonly used to characterize the electrical properties of power devices is polarization and depolarization current (PDC) method. The objective of this paper is first to compare the dielectric properties of the stator coil without overhang insulation, the stator coil after hot-press process, and the stator coil with overhang insulation. The second objective is to compare dielectric properties of newly wound stator coil, the stator coil heated at {\mathrm {60^{\circ}C}}, and the stator coil heated at {\mathrm {90^{\circ}C}} for a specific time. The stator coils in this research were designed for a 6.6 kV 260 kW synchronous motor. For the stator coil without overhang insulation, the slot portion stator coil was wound by Nomex paper, Kremica tape, and conductive tape. For the overhang insulation, the end portion was wound by Filosam tape and polyester tape. Then, the PDC measurement was performed. The parameters from PDC analysis were used to assess dielectric properties. These parameters were composed of the PDC shapes, capacitance ratio, polarization loss and conduction loss. Test results showed that different insulation types applied for each part of the stator coil manufacturing provided different dielectric properties. This point should be considered when PDC measurement is performed with the whole insultion system of the high voltage motors.
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    Dielectric Properties of Resin Rich Stator Coil of High Voltage Motor during Processing
    (2018-11-14)
    Boonsathitthavorn, S.
    ;
    Phumipunepon, N.
    ;
    Kitcharoen, P.
    ;
    Pattanadech, N.
    One of the non-destructive test methods commonly used to characterize the electrical properties of power equipment is polarization and depolarization current testing. The objective of this paper is to study of the change of dielectric properties during the manufacturing stages of a stator coil used in 6.6 kV 260 kW motor. There were five steps to manufacture the resin rich stator coil. The first step, the copper coil was wound around by NOMEX paper. Then the slot portion of the stator coil was wound by KREMICAL tape as the second process and by the conductive tape as the third process. Then, the insulation and conductive layer of the stator coil were pressed and cured at 160°C for one and a half hour as the fourth process. The pressing and curing will combine the multi insulation to be homogeneous insulation of the stator coil. The final step, the end winding portion was wounded by Filosam tape and polyester tape. The polarization and depolarization currents were measured and recorded after finishing each manufacturing process. From the test results, the polarization currents and depolarization currents obtained from each step were clearly different. Then the polarization and depolarization currents, conduction current and capacitance of the test results were analyzed and reported in this paper.