Turbogenerator Stator Core Study

Edmonds, J.S.; Daneshpooy, A.; Murray, S.; Sire, Robert A.

doi:10.1109/demped.2007.4393134

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…While the majority of reported core faults occur on the core surface [10], sources such as vibration and interlamination insulation aging deteriorations can act at any point in the core body causing buried faults. The relative paucity of detected buried faults may however be exacerbated by their lower detectability, a problem since they can be very destructive with the ability to rapidly destroy a generator [12].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic modelling and detection of buried stator core faults

Bertenshaw¹,

Smith

et al. 2017

IET Electric Power Applications

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Interlamination insulation faults in the stator cores of large electrical machines can damage both winding insulation and stator core, thus confidence in electromagnetic test results is important. They may be validated by FE methods, however the 3D models required for short faults are computationally challenged by laminated structures, requiring approximations. A homogenised 3D FE model was used to model faults buried in the teeth and yoke of the core, with a new experimental methodology developed to calibrate fault currents. Limitations were identified in modelling just a core section due to images and the constraint of axial packet air gaps on fault flux dispersion. A system of transverse 2D FE models of the principal fault flux paths in the core were constructed to estimate the differential impact on fault signals by the air gap presence and applied to the 3D FE model. Together with corrections for images this gave close predictions of experimental results, supporting the validity of the model. The verified electromagnetic test results now permit assessment of the threat that a detected buried fault presents.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic modelling and detection of buried stator core faults

Bertenshaw¹,

Smith

et al. 2017

IET Electric Power Applications

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“…The SCF creates a circuit via the building keybars that encircles the core's magnetic flux and allows significant induced fault current to flow. This SCF can consequently cause dangerous local 'hot-spots' to occur in the region of the damage, which even if modest, can affect the integrity and life expectancy of nearby winding insulation [2], and potentially develop enough energy to melt the stator iron [3,4].…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional finite element analysis of large electrical machine stator core faults

Ho¹,

Bertenshaw²,

Smith

et al. 2014

IET Electric Power Applications

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Faults in the stator cores of large electrical machines can both damage local winding insulation and propagate to catastrophic failure. This study develops three-dimensional finite element models of inter-laminar insulation faults in order to obtain a deeper understanding of the electromagnetic behaviour of core faults and the sensitivity of sensing systems. The problem of developing a model that adequately reflects the laminar constraints of the structure, while remaining computable is addressed, together with eliminating images from boundaries. The model was validated by experimental measurement and results shown to be closely matched, with the fault current distribution also predicted. The sensitivity profiles for various fault positions and lengths were determined, which enables condition-monitoring sensors to be more specific about the location and true threat that a fault signal may pose to the machine.

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“…Recently, Edmonds et al 11 investigated the stator core melt-through holes using mathematical and finite element modeling, gave the results of failure analysis. Through a great deal calculation, the parametric design and simulation analysis of stator electromagnetic system of 1000MW turbogenerator were performed by…”

Section: Introductionmentioning

confidence: 99%

Simulating Effective Engineering Elastic Constants of the Stator Core Lamination

et al. 2011

Polymers and Polymer Composites

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In this paper, we study the problem of effective engineering elastic constants of stator core lamination of water turbogenerator. The three-dimensional transformations of elastic constants of composite lamina between the principal material coordinate system and the reference coordinate system are given, then the stator core lamination is modeled as the composite laminate and by utilizing the thick laminated plate model, we determine effective engineering elastic constants of the stator core lamination. Finally, a simple example is included to demonstrate the validity of the model and the programme codes.

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Turbogenerator Stator Core Study

Cited by 7 publications

References 2 publications

Electromagnetic modelling and detection of buried stator core faults

Electromagnetic modelling and detection of buried stator core faults

Three‐dimensional finite element analysis of large electrical machine stator core faults

Simulating Effective Engineering Elastic Constants of the Stator Core Lamination

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