| 摘要 |
1,219,158. Arc-rupturing in switches. SIEMENS A.G. 31 July, 1968 [4 Aug., 1967], No. 36608/68. Addition to 1,127,658. Headings H1K and H1N. A switching arrangement for a superconducting cable 1 comprises superconductive means 2 in series with an isolator 5 and in parallel with a circuit-breaker 8, the superconductive means changing from its superconducting state to its high resistance normallyconducting state when control means are operated to increase the current density in the means 2 or part thereof. In Fig. 1, the means 2 is formed by two groups of conductors 3, 4, the larger group 4 being switched out by an isolator 6 to increase the current density in the smaller group 3. The isolator 5 is then opened and the current in the cable 2 is interrupted by the circuit-breaker 8 so that heat due to arcing is generated outside the thermal insulation of the superconducting means and cable. Figs. 2 and 3 (not shown) illustrate arrangements in which the conductors of the means 2 are associated with individual isolator contacts. In another arrangement, the current density in the means 2 is increased by discharging a capacitor through the superconducting means 2. The contacts of the isolators 5 and 6 and the conductors of the means 2 may be of niobium- 65 atom per cent titanium or niobium-25 atom per cent zirconium. The conductors may have a coating of pure aluminium and reference is made to the numbers and sizes of the conductors of the superconducting means. The conductors are insulated from one another and may form the warp filaments of a woven fabric, the weft filaments being of insulating material. |
