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http://dx.doi.org/10.9714/psac.2011.13.3.024

A Study on the Quench Initiation and Propagation Characteristics in GdBCO Racetrack Pancake Coil for Large-Scale Rotating Machines  

Yang, D.G. (고려대학교 신소재공학과)
Song, J.B. (고려대학교 신소재공학과)
Kim, K.L. (고려대학교 신소재공학과)
Kwon, O.J. (고려대학교 신소재공학과)
Lee, W.S. (연세대학교 전기전자공학과)
Ko, T.K. (연세대학교 전기전자공학과)
Lee, H.G. (고려대학교 신소재공학과)
Publication Information
Progress in Superconductivity and Cryogenics / v.13, no.3, 2011 , pp. 24-30 More about this Journal
Abstract
The stability issue of high temperature superconducting (HTS) racetrack coils is one of the most important factors for the development of large-scale rotating machines, such as ship propulsion motors and power generators. However, The stability and normal zone propagation characteristics of HTS racetrack pancake (RP) coils are not sufficient yet. In this study, quench tests for a GdBCO racetrack pancake coil were carried out under the condition of $LN_2$ at 77 K. Minimum quench energy and two-dimensional normal zone propagation velocities of the coil are also discussed. Normal zone propagation velocity in the coil's curved section is faster than in its straight section due to stress effects. The test results show that the protection of the straight section is of greater importance than that of the curved section when GdBCO racetrack pancake coils are applied to large-scale rotating machines.
Keywords
quench; GdBCO; HTS racetrack coil; normal zone propagation velocity;
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