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Investigation of Voltage Stresses Inside Adjustable-Speed Drives

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3 Author(s)
Lixiang Wei ; Allen Bradley, Rockwell Autom., Mequon, WI, USA ; Zhijun Liu ; Gary L. Skibinski

This paper investigates the effect of voltage stress on the voltage insulation components inside a regenerative active-front-end adjustable speed drive (ASD). It shows that a high potential voltage insulation issue may exist on various components inside the ASD and cause earlier failures. A simplified system model to describe this phenomenon is described, and the voltage stresses of different components inside the ASD under different grounded conditions are analyzed. It is concluded that a much higher voltage stress may exist in different locations of the drive under different grounding systems. Appropriately designing the insulation components is critical to protect the drive.

Published in:

IEEE Transactions on Industry Applications  (Volume:49 ,  Issue: 1 )