Development and test of a 220 kV/1.5 kA resistive type superconducting fault current limiter

Abstract

Within a collaboration of Jiangsu Zhongtian and Beijing Jiaotong University, one phase of 220 kV/1.5 kA resistive type superconducting fault current limiter (SFCL) has been developed for testing. The current limiting unit of the SFCL consists of 8 series connected modules, and each of the module is composed of 16 parallel connected bifilar coils. The used high temperature superconductor (HTS) is the 12 mm wide steel-stabilized YBCO conductor supplied by Shanghai Superconductor. The current limiting unit is assembled in a cryostat with liquid nitrogen. The device has been successfully subjected to steady-state tests, fault current limiting tests and insulation tests. According to the testing results, the SFCL passed 22 current limiting tests at various prospective fault currents between 10 and 63 kArms for a fault duration of 100 ms, and the maximum limiting resistance could be as high as 3.5 Ω. The power frequency test at 360 kVrms for 1 min and lightning impulse test at 850 kV(1.2 µs/50 µs) have been carried out according to the Chinese national standard GB 1094.3.