Large low-speed hydro-generators – unbalanced magnetic pulls and additional damper losses in eccentricity conditions

Keller, Stefan; Xuan, M. Tu; Simond, J.-J.; Schwery, A.

doi:10.1049/iet-epa:20060504

Cited by 41 publications

(25 citation statements)

References 14 publications

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“…5) created by the rectangular mmf is (4) In order to avoid an unipolar magnetic field (MAXWELL'S equation 'YB = 0 must be satisfied), the offset C is determined such as (5) where .>. is the circumferential length of the repetitive section of the machine.…”

Section: B Determination Of Damper Bar Inductancesmentioning

confidence: 99%

“…KNIGHT et al [5], [6] use the same method for standard machines. KELLER [4] in his PhD thesis uses finite-element computations combined with an analtyic approach to predict damper currents at rotor unbalance. The PhD thesis of KRATKI [7] describes the usage of an inductance model in order to calculate the influence of damper currents on the voltage shape of the stator winding.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

Traxler-Samek

Lugand

Schwery

2008

2008 18th International Conference on Electrical Machines

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This paper presents an analytical method for the calculation of currents and power losses in the damper winding of large salient-pole synchronous machines at various steadystate operational conditions. The algorithm is based on a damper winding network containing aU damper bars of a repetitive section of the machine. The self and mutual inductances as weD as the induced voltages are computed taking into account the air-gap permeance function.The presented algorithm is used to compute currents in the damper winding at open-and short-circuit test conditions. The obtained analytical results are compared with the results of transient finite element studies.

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Section: B Determination Of Damper Bar Inductancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

Traxler-Samek

Lugand

Schwery

2008

2008 18th International Conference on Electrical Machines

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“…where l b denotes the length of the damper bar, v ν 1 is one of the velocities in (11), andB ν 1 is the peak flux density of one of the waves of (10). The total bar EMF can be obtained via summationŪ…”

Section: Damper Voltage Calculationmentioning

confidence: 99%

On Permeance Modeling of Large Hydrogenerators With Application to Voltage Harmonics Prediction

Ranlöf

Perers²,

Lundin

2010

IEEE Trans. Energy Convers.

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In this paper, a permeance model that can be employed to estimate the no-load damper current loss and voltage waveform harmonics in large hydrogenerators is presented. The importance of modeling the damper magnetomotive force and inductances correctly is emphasized, and detailed descriptions are presented. The computed harmonics are compared with values obtained from time-stepped finite-element calculations and measured data. The results are in good agreement. The influence of pole-topole damper bar connections, and of the number of damper bars on the voltage waveform, is explained.

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“…And an analytical algorithm based on equivalent network is adopted in reference [9] to analyze the damper winding currents and losses when the generator is operated at rated and no-load conditions. In reference [10], a combined numerical and analytical method for the computation of unbalanced magnetic pulls, damper bar currents and losses of laminated low speed hydro-generators in eccentricity conditions under no-load is proposed. And the rotor temperature distribution of hydro-generator is calculated in fluent and temperature field method in reference [11].…”

Section: Introductionmentioning

confidence: 99%

Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator

Liao¹,

Fan²,

Han³

et al. 2013

Archives of Electrical Engineering

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Abstract:In order to research the losses and heat of damper bars thoroughly, a multislice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively. The factors such as rotor motion and non-linearity of the time-varying electromagnetic field, the stator slots skew, the anisotropic heat conduction of the rotor core lamination and different heat dissipation conditions on the windward and lee side of the poles are considered. Furthermore, according to the different operating conditions, different rotor structures and materials, compositive calculations about the losses and temperatures of the damper bars of a 36 MW generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied and the generator design is reasonable.

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Large low-speed hydro-generators – unbalanced magnetic pulls and additional damper losses in eccentricity conditions

Cited by 41 publications

References 14 publications

Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

On Permeance Modeling of Large Hydrogenerators With Application to Voltage Harmonics Prediction

Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator

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