A superconducting generator (SCG) consists of a non-magnetic cryogenic rotor, which contains a superconducting field winding cooled by liquid helium, and an airgap armature winding, which makes it possible to get a high magnetic field in the airgap. Since the SCG construction differs from that of the conventional generator, practical application requires that its electrical and mechanical design methods be established.
This paper describes electrical characteristics equations of the SCG, electromagnetic shield characteristics of double dampers and proof test results of a 50 MVA experimental SCG. Equations for the generator parameters (voltages, output capacity, reactances, time constants, flux densities), which are useful for practical design of the SCG, are derived from two dimensional electromagnetic analysis considering winding thickness and the edge effect. From comparison with measured and calculated values of no-load, sudden 1-3 phase short-circuit and slip extended tests, these equations were confirmed as valid.
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