Abstract
The erosion of the stress grading system of converter-fed rotating machines may occur by partial discharges and heat generation. There remain unclear issues in the formation of the potential and temperature distributions along the stress grading system of coils. In this paper, the potential distributions on the stress grading system of the model coil bar are measured under the application of 1 kHz square wave voltages of 10 kV in peak to peak value with/without 5 kV DC biased voltage. It turns out that DC bias voltage has little effect on potential distribution on a coil surface.
Highlights
The importance of converter-fed drives to control high voltage rotating machines have been increasing for energy saving and high efficiency recently
These drives using pulse width modulation (PWM) have adverse effects on the insulation system for rotating machines especially those in which the stress grading system is used in the end-winding design.[1, 2]
Potential distributions were measured under square wave voltages with/without DC components to make the influence of DC component in the applied voltage clear
Summary
The importance of converter-fed drives to control high voltage rotating machines have been increasing for energy saving and high efficiency recently. These drives using pulse width modulation (PWM) have adverse effects on the insulation system for rotating machines especially those in which the stress grading system is used in the end-winding design.[1, 2]. The stress grading system consists of corona armor tape (CAT) and stress grading tape (SGT). It works efficiently under operations of commercial frequency, erosion of the insulation by partial discharges and heat generation is relieved.[3]. Potential and temperature distributions are measured under 1 kHz square wave voltages of 10 kV in peak to peak value with/without 5 kV DC biased voltage to figure out the influence of DC biased voltage
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