Abstract
This study is concerned with the electrical dimensioning of passive, electromagnetic shields surrounding air gap armature windings for slow-speed multi-polar superconducting-field generators which make exclusive use of conductive rather than integrated conductive and ferromagnetic shields. Special reference is made to the problem of screening the composite stator winding and superconducting field for environmental and improved short-circuit protection rather than being applied to damp transient rotor oscillations. The conceptual machines used to illustrate the limitations on exclusive conductive shielding are 6–48 pole units with a corresponding stator rating ranging from 40 to 400 MVA at 60-Hz output. The specific cryogenic rotor circuit incorporates a Nb-Ti superconductor cable with design details included to calculate winding inductances and intermagnet forces. A high-voltage multilayer stator winding is dimensioned for numerically determining the Maxwell stress vector in the vicinity of the stator shield and reducing the load-dependent, radial magnetic forces on the superconductor.
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Abbreviations
- b :
-
= instantaneous magnetic flux density
- g i :
-
= airgap between ith stator winding and shield inner periphery
- J si :
-
= stator winding current loading of ith layer
- t :
-
= time
- T :
-
= stator shield magnetization time constant
- x :
-
= azimuthal distance from entry edge of excitation winding
- X :
-
= reactance at 60 Hz
- z :
-
= total number of stator winding layers
- µ o :
-
= free-space permeability
- ω :
-
= electrical radian frequency
- ρ :
-
= resistivity
- τ :
-
= pole pitch
- d :
-
= direct axis
- i :
-
= stator winding ith layer
- q :
-
= time quadrature component
- s :
-
= stator
References
S. Kuznetsov, IEEE Trans. Magn. Mag-15:719 (1979).
G. G. Lessmann, W. A. Logsdon, R. Kossowsky, M. P. Mathur, and J. M. Wells, “Structural Materials for Cryogenic Applications,” Rept. 74–9D4-CRYMT-2, National Bureau of Standards Contract No. CST-9304, Westinghouse Electrical Corporation, Pittsburgh, Pennsylvania (1974).
P. Thullen, T. A. Keim, and J. V. Minervini, IEEE Trans. Magn. Mag-II:653 (1975).
C. J. Carpenter and M. Djurovic, Proc. IEEE 122: 681 (1975).
E. R. Laithwaite, Induction Machines for Special Purposes, Chemical Publishing Company, New York (1966), p. 76.
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© 1980 Springer Science+Business Media New York
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Kuznetsov, S. (1980). Conductive Armature Shielding Design Concepts for Slow-Speed Superconducting Generators in the 40- To 400-MVA Range. In: Timmerhaus, K.D., Snyder, H.A. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 35 A. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9856-1_17
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DOI: https://doi.org/10.1007/978-1-4613-9856-1_17
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