| 摘要 |
<p>PURPOSE:To apply AC recovery voltage to a breaker to be tested after breaking operation by providing a second voltage source circuit applying AC recovery voltage of the same phase as a current source circuit in rotation with a first voltage source circuit applying DC recovery voltage to the breaker to be tested after breaking operation. CONSTITUTION:When a charging switch 3 is closed from such a state that a protective breaker 2, an auxiliary breaker 6 and a breaker 7 to be tested are closed, a short circuit current I flows to the breaker 7 to be tested. When the breaker 7 to be tested succeeds in breaking, the current IV of high frequency of a voltage source circuit 18 is cut off and transient recovery voltage appears in the breaker 7 to be tested. Thereafter, the charged voltage of a transient recover voltage frequency adjusting condenser 10 is applied to the breaker 7 to be tested. Next, the breaker 14 for cutting off the voltage source circuit is opened to cut off the voltage source circuit 18. Immediately thereafter, a breaker 15 for closing a power supply circuit is closed to connect the high voltage tap of a current supply source voltage boosting transformer 16 to the breaker 7 to be tested. By this method, AC recovery voltage Er having a predetermined value is applied to the breaker 7 to be tested.</p> |
