Effectiveness of Stress Grading Coatings on Form Wound Stator Coil Groundwall Insulation Under Fast Rise Time Pulse Voltages

Espino-Cortés, Fermín P.; Cherney, E.A.; Jayaram, S.

doi:10.1109/tec.2005.853745

Cited by 66 publications

(27 citation statements)

References 8 publications

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“…A set of nonlinear differential equations is then formulated and solved for the optimal design parameters [2,4]. Other authors have used a finite element approach to study the effects of high frequency pulse width modulated controllers [5]. If the material parameters are known with sufficient accuracy, the finite element approach should produce better ultimate accuracy.…”

Section: Methods Of Analysismentioning

confidence: 99%

Minimization of local field enhancement along stress-grading systems of HV large rotating machines

El-Kishky

Hebner

Abdelsalam

et al. 2006

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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In this paper, an approach to the design of nonlinear stress-grading systems of high voltage rotating machines at different frequencies is presented. The parameters of stress-grading systems are selected to minimize the local electric field enhancement at a set of discrete operating frequencies. The nonlinear stress-grading resistances are updated in response to the dynamic change of the local surface field compared to the desired average field. This development allowed fast and accurate design and analysis of nonlinear stress-grading systems with the deviation of the highest local field from the desired average field kept very low over a frequency range of up to 300 Hz. Simulation examples and several optimal stress-grading system characteristics are also presented.

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Section: Methods Of Analysismentioning

confidence: 99%

Minimization of local field enhancement along stress-grading systems of HV large rotating machines

El-Kishky

Hebner

Abdelsalam

et al. 2006

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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show abstract

“…These gradings make testing or operation problematic at dc [8], with high harmonics [9] in a line connected situation, and at high frequencies [10], as seen from inverter switching. Given the wide range of potential environments, it is unlikely that there will be a general solution to this problem.…”

Section: Motorsmentioning

confidence: 99%

Electrical insulation challenges for rotating machines used on future electric ships

Hebner

2007

2007 Electrical Insulation Conference and Electrical Manufacturing Expo

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Abstract-The electrification of ships coupled with a demand for very high power and energy density raises challenges for insulation system designers for this market. The physical reason the design is challenging is that the electrical, mechanical, and thermal environment on a ship is sufficiently far from the land-based environment that key parts of the data and experience base needed for insulation system design do not exist.

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“…High frequency component pulses are generally of no concern to the ground wall insulation, and they only affect the stress grading system and turn insulation [5]. The stress grading of form-wound motors has been previously addressed [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of times-to-failure of various turn insulations of form-wound coils under PWM voltage waveform

Moonesan

Jayaram

Cherney

et al. 2013

2013 IEEE Electrical Insulation Conference (EIC)

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The paper presents the results of an experimental work to examine the times-to-failure of various types of turn insulations used in form-wound stator coils. A unipolar PWM waveform with a peak of 12 kV, rise time of approximately 270 ns and switching frequency of 3 kHz is used for aging. The types of insulations studied include enamel, Daglas®, mica tape with polyester film, and enamel plus mica glass tape. The time-tofailure data are analyzed using two-parameter Weibull statistics. The breakdowns are examined microscopically providing information as to the probable reason for the failures. The role of each type of insulation; enamel, Daglas® and mica polyester film tapes, and their dimensions are discussed to explain the times-tofailure under PWM aging.

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Effectiveness of Stress Grading Coatings on Form Wound Stator Coil Groundwall Insulation Under Fast Rise Time Pulse Voltages

Cited by 66 publications

References 8 publications

Minimization of local field enhancement along stress-grading systems of HV large rotating machines

Minimization of local field enhancement along stress-grading systems of HV large rotating machines

Electrical insulation challenges for rotating machines used on future electric ships

Analysis of times-to-failure of various turn insulations of form-wound coils under PWM voltage waveform

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