| 摘要 |
1,079,878. Testing circuit breakers. A. REYROLLE & CO. Ltd. June 30, 1966 [June 30, 1965], No. 27731/65. Heading G1U. Apparatus for testing circuit breakers of the type having a power frequency low voltage source S is arranged to supply the heavy rest current to the test circuit breaker T and a capacitor C s to provide a high voltage shortly before opening the circuit breaker is characterized by the provision of an auxiliary circuit Q by which a high voltage power frequency signal is connected across the capacitor C s to provide an A. C. recovery voltage. This voltage is applied via switch p<SP>1</SP> at an instant so related to the initiation of the discharge of capacitor C s through T, that by the instant of opening T the current in the auxiliary circuit has reached a value sufficient to supply the current required in resistor R to damp the transient recovery voltage without oscillation. |
