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Superconducting Fault-Current Limiter for 200-Vrms-Class Circuits Using YBa2Cu3Ox Thin Film by Chemical Vapor Deposition

A superconducting fault-current limiter (FCL) for 200-Vrms-class circuits using YBa2Cu3Ox (YBCO) thin film fabricated by chemical vapor deposition (CVD) was investigated. The FCL consisted of a 400-nm-thick YBCO film with meander pattern of 1 mm wide×115 mm long. The film was coated with a protective silver film having a thickness varying between 110 and 130 nm from place to place. Half-cycle alternating voltage (50 Hz) was applied to the FCL device which was immersed in liquid nitrogen (77 K), and a typical current-limiting waveform was measured. When a voltage of 200 Vrms was applied, the fault current with a peak of 400 A was limited to the peak let-through current of 11 A. The beginning time of the current limiting was about 0.1 ms.