| 摘要 |
<p>PURPOSE:To adjust and operate the setting of a voltage setter at a proper value before processes enter the final step of synchronous parallel connection by mounting a voltage feedback-ratio changeover circuit to a voltage feedback path for an automatic voltage regulator. CONSTITUTION:A breaker CB2 is closed first, and a motor GM is supplied with power from a reduced voltage tap Tb for a transformer M-TR and started. Voltage feedback-ratio changeover circuits 1A and 60A are brought to the state of a ratio (n) under the state of synchronous operation by feed from the reduced voltage tap Tb, and an automatic voltage regulator AVR and a voltage balancer 60 are brought to the state of operation. The adjustment operation of a voltage setter 90R is completed, and the breaker CB2 is interrupted while the ratio of the voltage feedback-ratio changeover circuit 1A is changed over to 1. A breaker CB1 is closed at a point of time when voltage phase coincides with each other. Accordingly, the terminal voltage of a synchronous machine can be connected synchronously in parallel under the state in which the terminal voltage coincides with the voltage at the point of parallel connection.</p> |
