Research on the Impact of Screen Properties on Eddy Current and Flux in End Region of a Large Air-Cooled Turbo-Generator

Wang, Likun; Chen, Wen; Tao, Dajun; Li, Weili; Ge, Baojun

doi:10.1109/tec.2015.2487513

Cited by 23 publications

(6 citation statements)

References 17 publications

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“…The positions of the rotor and stator end-windings are also optimized, and a magnetic shield is often added between the stator core and the end-windings (Wang et al, 2016;Huo et al, 2013). This shield may be highly conductive, so that eddy currents prevent the axial component from going through the shield or it may have a high permeability to channel and control the magnetic flux path.…”

Section: Axial Magnetic Fluxmentioning

confidence: 99%

Practical model of the axial magnetic field in the end region of large turbo-generators

Demian

Romary

Vogt

et al. 2019

COMPEL

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Purpose The axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and thus stator faults. Design/methodology/approach It is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine. Findings The authors provide a practical model of the axial magnetic field based on a simplified vector diagram. The parameters required to build the vector composition of the flux densities are assessed with a limited number of finite element method simulations of the whole end-region of the machine. These simulations were validated by an experimental test on a real turbo-generator. Then the axial flux density was simply estimated for various operating points. Originality/value The originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram.

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Section: Axial Magnetic Fluxmentioning

confidence: 99%

Practical model of the axial magnetic field in the end region of large turbo-generators

Demian

Romary

Vogt

et al. 2019

COMPEL

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“…Also researches on monitoring of machine parameter with a combined measurement of different types of sensors e.g. flux and vibration or force, rotor interconnection monitoring using flux and current and partial discharge monitoring can be carried out successfully with this sensors configuration [55], [56], [57], [7], [58], [59], [60], [61], [62].…”

Section: Excitation Circuitmentioning

confidence: 99%

“…studying of circulating current or partial discharge behavior in large generators [1], [2], [3], [4]. The studies also go through the calculation of flux densities in various locations in generator under different conditions [5], [6], [7], [8], [9], [10], [11]. Also the generator grid interactions are studied in detailed [12], [13], [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Large Electrical Machine Test

Ebrahimi¹

2018

Preprint

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The acceptability and also the acceleration ofrenewable energy technologies is tightly linked with a betterunderstanding of dynamic behavior of drive train componentsand their interactions. This ultimate understanding of systemcharacteristics can only be achieved with comprehensiveexperimental investigations on different phenomena of largeelectrical generators. This leads consequently to a betterverification of numerical and analytical models of largegenerators. The large generator-converter lab which is discussedin this paper is a unique opportunity for deep experimentalinvestigations on large hydro and wind generators. It is designedto deal with the current as well as future research topics in thefield of wind and hydro generators and their interactions withpower electronic devices and electrical grid.

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“…Moreover, a comparison was made between the calculation results and the simulated predictions [10]. Wang et al conducted a theoretical study of the eddy current loss in the end structure of a large turbo-generator and revealed the change mechanism of the eddy current loss in different screen end structures [11]. Ranlöf et al used the analytical rotation field model to evaluate the damping eddy loss in a large generator under a steady-state load condition and analysed model characteristics such as the saturation permeability and the damping circuit structure.…”

Section: Introductionmentioning

confidence: 99%

Finite‐element analysis combined with an ensemble Gaussian process regression to predict the damper eddy current losses in a large turbo‐generator

Zhao

Guo

Wang

et al. 2020

IET Science, Measurement & Technology

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Research on the Impact of Screen Properties on Eddy Current and Flux in End Region of a Large Air-Cooled Turbo-Generator

Cited by 23 publications

References 17 publications

Practical model of the axial magnetic field in the end region of large turbo-generators

Practical model of the axial magnetic field in the end region of large turbo-generators

Characterization of a Large Electrical Machine Test

Finite‐element analysis combined with an ensemble Gaussian process regression to predict the damper eddy current losses in a large turbo‐generator

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