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Ian Culbert (deceased) Iris Power-Qualitrol
Editor’s Note: The following article was written by Ian Culbert, an engineer with Iris Power - Qualitrol in Mississauga, Ontario, Canada. It was submitted for publication by John Letal of Iris Power - Qualitrol and member of EASA’s Technical Services Committee. Sadly, Mr. Culbert passed away recently. We appreciate his contributions to the industry.
Introduction Due to their ever decreasing costs, variable frequency drives (VFDs) are becoming more popular for energy conservation and the reduction in inrush currents during motor starting. The most widely used type of drive today is a voltage-source, with pulse width modulated (VS-PWM) inverter, since it tends to be less expensive than other possible topologies.
In the past decade, medium and high voltage motors rated 2.4 kV to 13.8 kV fed by VS-PWM drives have become more common. Currently motors rated up to 100 MW are being designed. Motors supplied from such drives have seen premature stator winding failures since the voltage impulses from the drive can lead to rapid insulation system aging. In most cases, as the aging progresses, the partial discharge (PD) activity increases. Thus, there is a desire for on-line PD detection for such motors.
Unfortunately measurements with conventional electrical PD detectors tend to be masked by 1000-3000 V impulses created by multi-stage VS-PWM drives. The rise time of the voltage impulses from the multi-stage VS-PWM drives tend to be 500 ns or longer. This article describes the technical issues in on-line PD detection on motors fed by VS-PWM drives, and gives an example of one system that detected the PD successfully.
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This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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