| 摘要 |
1,078,030. Arc rupturing. ENGLISH ELECTRIC CO. Ltd. Oct. 9, 1964 [Sept. 12, 1963], No. 35985/63. Heading H2B. A high - voltage A.C. circuit - interrupting arrangement comprises a superconducting switch and a series-connected circuit-breaker. In one arrangement the superconducting switch is connected in series with a normally-open circuit-breaker across a normally closed circuit-breaker. When a fault occurs, the normally-closed circuit-breaker is opened, the normally-open circuit-breaker is closed at a suitable instant before a current zero, a critical magnetic field is applied to the superconducting switch to switch it from its superconducting state to its high resistance state at the current zero, and the series-connected circuit-breaker is then opened to interrupt the residual current through the superconducting switch. In another arrangement the superconducting switch is normally in circuit and is switched to its high-resistance state when a fault occurs, the series-connected circuit-breaker being opened at the next current zero. In this arrangement the switch is shunted by a capacitor and a resistance. The superconducting switch may be that of Specification 1,078,029 and the circuitbreaker or each circuit-breaker may be that of Specification 960,402.
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