Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms

Espino-Cortés, Fermín P.; Asiain-Olivares, Tomas I.; Gómez, Pablo

doi:10.1109/icacact.2014.7223542

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…The electrical conductivities of CAT and SGT in this table were calculated by dividing the reciprocal of the surface resistivity obtained experimentally by the layer thickness. It has been reported that the CAT conductivity highly affects the properties of the potential distributions and the heat generations at the SG system under the high-frequency voltage pulses [9]. Specifically, the short rise time of the applied pulses results in the potential drop at the CAT and the local heating at the interface between the CAT and the stator core [2,14].…”

Section: Simulation Model and Meterial Propertiesmentioning

confidence: 99%

“…Espino-Cortes et al investigated the power densities and the electric field as functions of the CAT conductivity and PWM levels by the equivalent circuit model simulation [8] and by the finite element method (FEM) computation [9]. Nam et al developed the transient electric field and thermal coupled the finite element method (FEM) -based simulation to investigate the influence of the PWM levels on the temperature rise at the SG system [10].…”

Section: Introductionmentioning

confidence: 99%

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Power Density and Temperature Rise Estimation at End-turn Stress Grading System of Large Rotating Machines under PWM Waveform

Umemoto

Nakamura

2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the time-averaged power densities as well as the resulting temperature rise, on an end-turn stress grading (SG) system under PWM waveforms as functions of the carrier and the fundamental frequencies are systematically investigated by finite element method-based computations. A novel analytical approximation method to estimate the power densities and the temperature rises without time-consuming numerical computations are proposed. As a result, the maximum power density and the temperature rise increase nearly linearly with increasing fundamental and the carrier frequencies. It is suggested that power dissipations in the SG layer by the fundamental frequency component of a PWM waveform and those by the carrier frequency component can be clearly separated. Moreover, the estimated power densities and temperature rises based on the analytical approximations show reasonable agreement with the numerically computed ones, which indicates the validity of the proposed estimation method.

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Section: Simulation Model and Meterial Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Density and Temperature Rise Estimation at End-turn Stress Grading System of Large Rotating Machines under PWM Waveform

Umemoto

Nakamura

2021

IEEE Trans. Dielect. Electr. Insul.

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“…(a) Tangential electric field distribution along the surface from the slot end of the coil under a phase to ground PWM waveform and (b) resistive heat[53].…”

mentioning

confidence: 99%

Modeling and Simulation of Rotating Machine Windings Fed by High-Power Frequency Converters for Insulation Design

Cortés¹,

Gómez²,

KhalilHussain³

2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Modern power systems include a considerable amount of power electronic converters related to the introduction of renewable energy sources, high-voltage direct current (HVDC) systems, adjustable speed drives, and so on. These components introduce repetitive pulses generated by the commutation of semiconductor switches, resulting in overvoltages with very steep fronts and high dielectric stresses. This phenomenon is one of the main causes of accelerated insulation aging of motors in power electronic-based systems. This chapter presents state-of-the-art computational tools for the analysis of motor windings excited by fast-front pulses related to the use of frequency converters based on pulsewidth modulation (PWM). These tools can be applied for the accurate prediction of overvoltages and dielectric stresses required to propose insulation design improvements. In the case of the stress-grading system used in medium-voltage (MV) motors, transient finite-element method (FEM) is used to study the effect of fast pulses. It is shown how, by controlling the material properties and the design of the stress-grading systems, solutions to reduce the adverse effects of fast pulses from PWM-type inverters can be proposed.

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Optimal insulation design of form-wound stator winding with stress grading system under fast rise-time excitation

Hussain

Gómez

2022

Electr Eng

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Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms

Cited by 12 publications

References 9 publications

Power Density and Temperature Rise Estimation at End-turn Stress Grading System of Large Rotating Machines under PWM Waveform

Power Density and Temperature Rise Estimation at End-turn Stress Grading System of Large Rotating Machines under PWM Waveform

Modeling and Simulation of Rotating Machine Windings Fed by High-Power Frequency Converters for Insulation Design

Optimal insulation design of form-wound stator winding with stress grading system under fast rise-time excitation

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