Title :
Transient shielding effect of slitted electrothermal shield of superconducting generator
Author :
Hahn, S.C. ; Cha, G.S. ; Lee, H.B. ; Bae, D.J. ; Kim, S.W. ; Hahn, S.Y. ; Won, Y.J.
Author_Institution :
Dept. of Electr. Eng., Dong-A Univ., Pusan, South Korea
fDate :
1/1/1992 12:00:00 AM
Abstract :
An electrothermal shield with direct axis directional slits is proposed for application to a superconducting alternator with quick-response excitation system. Using the finite element method combined with external circuit equations, short-circuit characteristics due to slitting effects are investigated by comparing three cases, conventional electrothermal shield (CES), slitted electrothermal shield (SES), and no electrothermal shield (NES) models, under three phase fault and line to line fault, respectively. The field current variations, flux densities in the vicinity of superconducting field winding, and the eddy currents of the SES model are computed and then compared with those of the CES and NES models. It is expected that the superconducting alternators with SES could adopt the quick-response excitation system
Keywords :
alternators; finite element analysis; shielding; short-circuit currents; stability; superconducting machines; direct axis directional slits; eddy currents; external circuit equations; field current variations; finite element method; flux densities; line to line fault; models; quick-response excitation system; short-circuit characteristics; slitted electrothermal shield; slitting effects; superconducting alternator; superconducting field winding; superconducting generator; three phase fault; transient shielding effects; transient stability; Alternators; Circuit faults; Damping; Eddy currents; Electrothermal effects; Magnetic analysis; Magnetic shielding; Shock absorbers; Stability; Thermal conductivity;
Journal_Title :
Magnetics, IEEE Transactions on
