EVALUATION OF THE EFFECTS OF ELECTRICAL STRESS DURING ACCELERATED THERMAL AGING ON DIELECTRIC PERFORMANCE OF INSULATION SYSTEMS FOR LOW VOLTAGE MOTORS - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

EVALUATION OF THE EFFECTS OF ELECTRICAL STRESS DURING ACCELERATED THERMAL AGING ON DIELECTRIC PERFORMANCE OF INSULATION SYSTEMS FOR LOW VOLTAGE MOTORS

Résumé

Three sets of 10 motorettes were characterized along aging. Thermal aging consisted of isotherms at 240°C. Electrical aging consisted of the application of an AC voltage just above the Partial Discharge Inception Voltage (PDIV). Aging sequence was a series of 6 cycles of 72 hours. In between aging cycles, the evolution of PDIV and Insulation Resistance on Coil-Coil and Coil-Ground configurations were monitored. Polarisation Index provided by the ratio of measured resistance after 10 min and 1 min were calculated. As concerns thermal aging, PDIV decrease was of 10 to 22%. This decrease occurred mainly after the first aging. Electrical aging under partial discharge activity can be revealed by a significant increase of the Polarisation Index. Electrical aging led to 90% failure during the third aging cycle with typical PD-free EIS while none of the motorettes with strengthened EIS were affected during six cycles. PD analysis revealed with the strengthened paper a specific behaviour consisting in a discontinuous regime of discharges.
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Dates et versions

hal-02282026 , version 1 (09-09-2019)

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  • HAL Id : hal-02282026 , version 1

Citer

D.M. Muhanuzi, J.G. Marchetta, Pascal Rain, M. Shanel, G. Vercesi. EVALUATION OF THE EFFECTS OF ELECTRICAL STRESS DURING ACCELERATED THERMAL AGING ON DIELECTRIC PERFORMANCE OF INSULATION SYSTEMS FOR LOW VOLTAGE MOTORS. 21st International Symposium on High Voltage Engineering 2019, Aug 2019, Budapest, Hungary. ⟨hal-02282026⟩
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