Modeling of power transmission and stress grading for corona protection

Zohdi, Tarek I.; Abali, Bilen Emek

doi:10.1007/s00466-017-1504-2

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…A photograph of an actual stator is shown in Figure 1. The model considered in this paper is shown in Figure 2 and considers the fact that the ends of the actual stator bars are curved and rotate [24,25]. In the model, the connections between the low, medium, and high resistive layers overlap by 20 mm [26], as shown in Figure 3.…”

Section: Model Of the Three-dimensional At The End Of A Stator Barmentioning

confidence: 99%

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Zhang

et al. 2018

Energies

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The electric field distribution at the end of a large hydro-generator is highly nonuniform and prone to corona discharge, which damages the main insulation and significantly reduces the service life of the hydro-generator. In order to reduce the thickness of the main insulation and the physical size of a large hydro-generator, it is necessary to understand the distribution of the electric field at the end of its stator bar. In this paper, the stator bar at the end of a large generator is simulated using the finite element method to determine the distribution of the potential, electric field, and loss at the rated voltage, as well as to elucidate the differences between the linear corona protection, two-segment nonlinear corona protection, and three-segment nonlinear corona protection structures. The influences of the arc angle, length of each corona protection layer, intrinsic resistivity of the corona protection material, and nonlinear coefficient are also analyzed. The results manifest that the angle of the stator bar should be 22.5 • , the difference in resistivity between the two adjacent corona protection coatings should not exceed two orders of magnitude, and the resistivity of the medium resistivity layer should be nearly 10 6 Ω·m or 10 7 Ω·m, for an optimal design of the corona protection structure.

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Section: Model Of the Three-dimensional At The End Of A Stator Barmentioning

confidence: 99%

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Zhang

et al. 2018

Energies

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Plate capacitor problem as a benchmark case for verifying the finite element implementation

Liu

Abali

Yang

et al. 2022

Continuum Mech. Thermodyn.

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In this work, parallel plate capacitors are numerically simulated by solving weak forms within the framework of the finite element method. Two different domains are studied. We study the infinite parallel plate capacitor problem and verify the implementation by deriving analytical solutions with a single layer and multiple layers between two plates. Furthermore, we study the finite parallel plate capacitor problem and verify it by Love’s potential equation and Xiang’s capacitance equation. Moreover, the fringing effect is considered and extended to problems with multiple dielectric layers, such a solution is not possible by means of the existing analytical solutions. Besides, we realize the possibility of choosing different boundary conditions (electric potential boundary conditions and charge density boundary conditions) by changing the weak form. Finally, a transient solution that includes dielectric loss and calculates the quality factor of a capacitor is presented, which may be used in capacitor design. Convergence and consistency of results are demonstrated by comparing the results between analytical and numerical solutions and also the results from different boundary conditions.

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Multiphysics computation of thermal tissue damage as a consequence of electric power absorption

Abali

Zohdi

2019

Comput Mech

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Modeling of power transmission and stress grading for corona protection

Cited by 3 publications

References 26 publications

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Plate capacitor problem as a benchmark case for verifying the finite element implementation

Multiphysics computation of thermal tissue damage as a consequence of electric power absorption

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