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Transient magnetic fields in the superconducting alternator

Transiente Magnetfelder beim Generator mit supraleitender Erregerwicklung

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Contents

The Fourier Transform method is used to compute transient magnetic fields in a 1.3 GVA superconducting alternator. The necessary frequency-response functions are measured in a scale-model and are used to show the spatial variation of the transient field. The study brings out the points on the field winding at which magnetic transients will be most severe.

Übersicht

Zur Berechnung transienter Magnetfelder bei einem 1,3 GVA Generator mit supraleitender Erregerwicklung wird die Fourier-Transformation verwendet. Die erforderlichen Frequenzgänge werden an einem maßstabgerechten Modell gemessen und daran die räumliche Änderung des transienten Feldes dargestellt. Die Untersuchung zeigt die Punkte stärkster Flußänderung auf der Erregerwicklung.

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Abbreviations

B :

Flux density,T

f :

Frequency, Hz

Δf :

Frequency sampling interval, Hz

F/2:

Folding frequency, Hz

i o (t), I o (f) :

Driving-current and its Fourier Transform

i d (t), I d (f),i q (t), I q (f) :

d- andq-axis transient stator currents and their Fourier Transforms

N :

Number of samples in Fourier Transform

S :

Screening-ratio frequency-response function

T :

Duration of transient calculated by Fourier Transform, sec

Δt :

Time sampling interval, sec

μ:

Permeability, H/m

ϱ:

Resistivity, Ohm-m

References

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  1. P.O. Box 43, 12301, Schenectady, N.Y., USA

    T. J. E. Miller

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Miller, T.J.E. Transient magnetic fields in the superconducting alternator. Archiv f. Elektrotechnik 62, 131–140 (1980). https://doi.org/10.1007/BF01579897

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  • DOI: https://doi.org/10.1007/BF01579897

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