Electrical and thermal analysis of the stress grading system of a large hydro turbine

Staubach, Christian; Hildinger, Thomas; Staubach, Axel

doi:10.1109/eic.2017.8004650

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The nonlinear transient electric field and thermal coupled simulation [10,12,13] was introduced to evaluate the timeaveraged power density and the temperature rise distributions at the SG system. Figure 2 shows a schematic of a 2-D axisymmetrical simulation model and its dimensions.…”

Section: Simulation Model and Meterial Propertiesmentioning

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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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%