NDLI: Transient potential measurement on stress grading under multi-level PWM

Content Provider	IEEE Xplore Digital Library
Author	Nakamura, T. Kumada, A. Ikeda, H. Hidaka, K. Boggs, S.A. Tsuboi, Y. Yoshimitsu, T.
Copyright Year	2015
Description	Author affiliation: Dept. of Electr. Eng. & Inf. Syst., Univ. of Tokyo, Tokyo, Japan (Nakamura, T.; Kumada, A.; Ikeda, H.; Hidaka, K.) \|\| Rotating Machinery Syst. Div., Toshiba Mitsubishi-Electr. Ind. Syst. Corp. (TMEIC), Tokyo, Japan (Tsuboi, Y.; Yoshimitsu, T.) \|\| Inst. of Mater. Sci., Univ. of Connecticut, Storrs, CT, USA (Boggs, S.A.)
Abstract	In this paper, the influence of lower-frequency voltage components in PWM voltage on the performance of stress grading system of motor insulation is investigated by observing the light emission of partial discharge and by measuring potential distribution under 2- and 3-level PWM and sinusoidal ac voltages. Computations by finite element method are conducted to determine electrical field on coil surface. According to the results, the potential gradient under PWM voltage is largest during the first pulse after polarity reversal, as space charge of reversed polarity accumulates at the interface between corona armor tape (CAT) and stress grading tape (SGT) due to a fundamental frequency component in PWM voltage. Therefore, the intensity of light emission during the first pulse is the largest. From the computed results, it has become cleared the maximum field at the interface between the CAT and the SGT becomes higher under PWM voltage than that under rectangular ac voltage whose jump voltage is the same due to such charge accumulation.
Starting Page	161
Ending Page	165
File Size	1721430
Page Count	5
File Format	PDF
ISBN	9781479973521
e-ISBN	9781479973545
DOI	10.1109/ICACACT.2014.7223536
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Frequency measurement Handheld computers Rotation measurement Stator cores Electrodes pulse width modulation end-winding of stator form-wound coil stress grading corona protection converter
Content Type	Text
Resource Type	Article

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