Effect of cryogenic temperature on electrical parameters of copper coil used in SMES

Abstract

With the inclusion of renewable energy sources, the variability of the power supply has increased. To reduce this variability, energy storage equipments such as superconducting magnetic energy storage (SMES) are required. The energy is stored in SMES coil, making its design very crucial. This paper presents the effect of cryogenic temperature on the resistance and inductance of air core solenoid. The experiment is performed on the copper wire wound over teflon and copper formers. The published mathematical model for the calculation of the coil inductances is taken and results are compared with measurements performed with an LCR meter. The difference between the measured and calculated inductance value for both coils is found to be less than 10% at 300 K. The cryogenic temperature is maintained by first using a liquid nitrogen bath and later by cryocooler.