Current limiting characteristics of transformer type superconducting fault current limiter

The transformer type superconducting fault current limiter is composed of a series transformer and a superconducting current limiting device. The primary winding of the transformer is connected in series to the power transmission line, and the secondary winding is short-circuited through the superconducting current limiting device whose normal resistance plays an important role in limiting the fault current. According to our previous investigations, the basic characteristics and the design indexes of the transformer type superconducting fault current limiter were clarified. In this paper, the results of the current limiting test of a 5 kVA class transformer type superconducting current limiter are analyzed in detail, and the limiting characteristics such as the dependency of the initiation current of the limiting operation on the fault phase angle are shown.