| 摘要 |
<p>PURPOSE:To miniaturize a device and constitute the same economically by a method wherein the rotor of an AC exciting synchronous machine is provided with a secondary exciting device, to which DC current or AC current having a low frequency lower than the predetermined value of slip is given. CONSTITUTION:A rotor 2 is excited by DC through a secondary exciting device 6 or excited by AC, having a low frequency with slip 3% or less and near DC, then, a phase converting disconnecting switch 13 and a starting switch 14 are thrown. Then, an AC exciting synchronous machine 100 is accelerated gradually by a thyristor starting device 15 to synchronize with the side of a system and when synchronizing condition is established, a generator breaker 10 is thrown to enter into water elevating operation. The secondary exciting device 6 is used upon starting so as to provide the rotor 2 with DC or AC, having a low frequency with a slip lower than a predetermined value, in such a manner and, therefore, a design, in which a load capacity is minimized, can be effected, utilizing efficiency is improved and operating efficiency can be increased.</p> |
