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Notice of Violation of IEEE Publication Principles
"High Temperature Superconducting (HTS) Generator Field Coil with Influence of Thermal AC Losses"
by David I. Eromon
in the Proceedings of the 33rd Annual Conference of the IEEE Industrial Electronics Society (IECON07), Nov. 2007, pp. 1280-1286
After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.
This paper contains significant portions of original text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission.
Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article:
"The Influence of Thermal Gradients on AC Losses in High-temperature Superconducting Coils"
by N. Magnusson and M. Runde
in the Superconductor Science and Technology Vol.15, No. 7, Institute of Physics Publishing, May 2002, pp. 1113-1118
As high-temperature superconducting (HTS) tapes approach commercially acceptable performance levels, attention should be paid to how to utilize these tapes in real applications. Coils with high temperature superconducting (HTS) are generally stable against transient thermal disturbances. Protection against spontaneous quenches is not a main design issue for an HTS coil. However, HTS coils used in many electric devices such as motors, generators, transformers, and current limiters will operate under over-current fault conditions, which may result in a coil quench and thermal runaway. Those electric devices should be able to ride through some grid fault conditions and remain functional. This requires a certain over-current capability of the HTS coils. This paper discusses the over-curr- ent requirements from grid faults and the thermal transient responses of a Bismuth strontium calcium copper oxide (BSCCO) coil. It presents the analysis results of the coil subjected to over-current pulses at different operating conditions. It also focuses on the AC losses due the combined effect of transport currents and magnetic fields oriented parallel to the surface of the tape, as is the situation in a large part of a coil. At the ends of a coil the magnetic field contains a component perpendicular to the surface of the tape.