Abstract
A cryogenic system was built as an open system for a 35 kV/90 MVA saturated iron‐core superconducting fault current limiter. It consists of an annular cylindrical liquid nitrogen dewar, cryogenic pipes, sensors, valves, and a control unit. A HTS dc bias coil was immersed with liquid nitrogen in the dewar. The control circuit constantly monitors the liquid nitrogen level and controls the supply of liquid nitrogen in accordance with the liquid nitrogen level change. Nitrogen vapor was directly released into the environment. Heat loss under different working conditions, such as no magnetization current, 150 A magnetization current, and on‐grid condition, was measured to evaluate the performance of the system. As compared with no magnetization current of the dc bias coil, evaporation of liquid nitrogen increases about 20% under the on‐grid condition.
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