| 摘要 |
<p>PURPOSE:To reduce the capacity of a voltage source for applying a recovery voltage and to eliminate the danger of the dielectric breakdown of a breaker to be tested by applying the high-voltage side voltage of a transformer to two break phases of the breaker to be tested with the opposite polarities, and testing the cutoff performance. CONSTITUTION:The breaker 5 to be tested and auxiliary breakers 7b and 7c are turned on and a three-phase short-circuit current is supplied from a three- phase short-circuit generator 4 to open the object breaker 5. Then, an arc begins to be generated between contactors and the 1st phase in which a current zero point is obtained firstly is cut off. Then, the 2nd and the 3rd phases are cut off at an electric angle 90 deg., and the auxiliary breakers 7b and 7c are turned off simultaneously with the cutoff of the 2nd phase, thereby disconnecting a current source circuit 6. A voltage source circuit 8, on the other hand, starts a three-point gap G by a starting device 13 which is operated with the signal of a current zero-point detecting device 12 to apply high voltages to the 2nd and the 3rd phases from a transformer T, thereby testing the 2nd and the 3rd phase cutoff performance.</p> |
