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    Item type:Publication,
    Condition assessment of MV motor based on charge difference and charge ratio analysis
    (2019-07-01)
    Nimsanong, P.
    ;
    Boonsaner, N.
    ;
    Pattanadech, N.
    Insulation resistance and polarization index tests have been conducted in utility companies as one of the major tools for evaluating the integrity of stator winding insulation of medium voltage motor. Unfortunately, the information obtained from the measurement results are the combination of the electrical problem and polarization problem in the insulation system not separated from each other. This paper presents a new approach so-called charge difference analysis (QDA) and charge ratio analysis (QRA) to identify the problem in stator winding insulation occurred from conduction mechanism or/and polarization mechanism. Moreover, proposed parameters which are QD, QG and QR have been conducted on field motors in the following case studies: The first group (A) consists of two motors of which one is new motor and the other one is severely aged motor, the second group (B) consists of two motors of which one is lightly loaded motor and the other one is thermally aged motor, and the third group (C) consists of a single motor, on which PDC measurements have been carried out after maintenance in 2014 and 2016 respectively. From experiments, it was found that proposed parameters are able to provide useful information about the condition of stator insulation, i.e. contamination or/and degradation.
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    Improvement of standard suspension type insulator by the semiconducting glaze for pollution condition
    (2007-12-01)
    Samanmit, U.
    ;
    Chusanapiputt, S.
    ;
    Phoomvuthisarn, S.
    ;
    Vassanasong, A.
    ;
    Pinjom, A.
    This paper presents the behavior of 52-1 standard type suspension insulators coated with semiconducting glaze in some areas of the bottom side adjacent to the pin of insulators. Computer simulation program was carried out to investigate the electric field distribution of all tested insulators. The simulation results show that maximum electric field strength of semiconducting glaze insulators are decreased 3.13-26.26% compared with that of ordinary suspension insulators. Then the flashover voltage of the test specimen was investigated both dry and salt fog pollution condition according to IEC 507. The test results show that corona inception voltage of semiconducting glaze insulator is increased under artificial contamination test but its dry flashover voltage is decreased with increasing the semiconducting glaze length. It was found that the suitable length of semiconducting glazed standard insulator is 28 millimeters that has increasing corona inception voltage and flashover voltages are in the acceptable voltage rang of ANSI 52-1 standard. © 2007 RPS.
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