We developed a 35kV/90MVA Superconducting Fault Current Limiter (SFCL) and installed it in a transmission network at Puji substation of China Southern Power Grid at the end of 2007. A 72 hour period of trial operation was conducted before the SFCL was commissioned into the grid. This device demonstrated having very low impedance in normal power transmission and no adverse effect on the power network. To fully examine its current limiting capacity, current limiting tests were conducted under artificially imposed short-circuit conditions on July 20, 2009. A series of five different tests, including a fail safe test, were carried out. The experimental results are in good agreement with design expectations. The device's current limiting capacity has been convincingly demonstrated. In this paper, we report some details of these tests and the resultant data.
A cryogenic system was built as an open system for a 35kV/90MVA saturated ironcore 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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