Temperature and Pressure Simulations of 66 kV 40 m HTS Cable System in Short-Circuit Current Accidents Compared With Experimental Results

A numerical analysis program has been developed to simulate the transient temperature and pressure distribution in an high-temperature superconducting (HTS) power cable cooled by a forced flow of subcooled LN
₂
during a short-circuit current accident. This computer simulation program includes computations of temperature and pressure profiles not only in the HTS power cable itself, but also in the cooling system, including the circulation pump. In 2015, Sumitomo Electric Industries demonstrated a 66 kV 40 m model cable with a fault current test, during which the void between the copper conductors of the copper former was filled by insulation material. In this study, simulations of the model cable were performed by considering that LN
₂
is not absorbed in the copper former. This simulation was found to more precisely match experimental data by considering the rise in LN
₂
temperature at the inlet and transient value of the thermal conductivity of the dielectric layer.