Abstract-One of the most promising applications in High Temperature superconductor (HTS) is SuperconductingMagnetic Energy Storage (SMES). At present, electrical storage systems reports 50-60% losses due to traditional use of conventional conductors. In order to overcome such challenges, HTS with efficient cooling must be employed in power applications. In the present work, a novel cooling concept with supercritical oxygen (SCO) has been proposed to maintain the superconducting state for wide range of applications. Moreover, the thermophysical properties such as viscosity, density, thermal conductivity and specific heat have been studied over a wide range of temperatures (154.58K-204.58K) and critical pressure 50.43bar. Further, the development of correlations for SCO above the critical temperature (T c +50K), and at critical pressure (P c +1bar) have been analyzed. The developed correlations can be used in predicting the performance of SMES power devices by prior modeling and simulations at various operating conditions. Index Terms-Correlation, SMES, supercritical oxygen, and thermophysical properties.

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