Current limiting level-time characteristic of a superconducting fault current limiter

✍ Scribed by Y.J. Tang; Y. Yokomizu; N. Hayakawa; T. Matsumura; H. Okubo; Y. Kito

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 663 KB
• Volume: 35
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(95)93577-m

✦ Synopsis

A model superconducting fault current limiter (SE-FCL) has been developed. The adopted superconducting cable is composed of six strands insulated from each other. The current limiting level of the SC-FCL is measured under two types of overcurrent, a sinusoidal and an inrush current. The results show that the current limiting level of the SC-FCL 1, increases with an increase in the rate of rise of the overcurrent. By introducing a new parameter of time-to-quench 4, it is found that lq increases with decreasing tf. This feature is taken as a current limiting level-time characteristic, i.e. the $-tf characteristic. The existence of the I,-tf characteristic found in the SC-FCL is qualrtatively explained by measuring current distribution among the six strands. The superconducting cable is driven to the normal state strand by strand. Some delay in time is found from the quench of the first strand to that of the last and this is recognized as an I,-& characteristic in its current limiting performance.