| 摘要 |
<p>1,057,190. Protective cut-out arrangements; vacuum switches. GENERAL ELECTRIC CO. Sept. 10, 1964 [Sept. 30, 1963], No. 37002/64. Headings H2B and H2K. [Also in Division H1] The boundary of the protected zone of line 11 (Fig. 2) is extended to the circuit-breaker A by enclosing the adjacent current transformer winding 30 (which like a current transformer winding at the other end of line 11 (Fig. 1, not shown) is connected to a differential relay 20 controlling the circuit-breakers at both ends of 11) in a conductive casing 80, 80a, connected to the primary conductor at 86 and in tubular conducting shields 102, 107 connected together at 108 only and to earth via pedestal 115. A current transformer winding 35 forming part of the protective system for line 12 may be arranged alongside 30. The casing is filled with sulphur hexofluoride. Flashovers at electrodes 131, 132 or at positions such as N, O, P, Q, M then produce an effective current linking the transformer secondary windings which results in operation of the appropriate differential relay. The circuit breaker A comprises one or several highly evacuated chambers 60 each containing a fixed contact 56 and a movable contact 58 secured to a bellows 63 operated by mechanism in earthed chamber 70 through linkage 69, 65.</p> |
