| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To switch the assigned current of an uninterruptible power supply unit while preventing an overcurrent from flowing to a maintenance breaker. <P>SOLUTION: Uninterruptible power units 1a-4a are provided with auxilliary relays 11c, 21c, 31c, 41c, and 12c, 22c, 32c and 42c, respectively. As regards the condition of the switching command of the assigned currents of the uninterruptible power supply units 1a-4a, it is conditioned that breakers 81 and 82 for bus communication should be switched on at first, and that further either of the maintenance breakers of output boards 1b-4b is switched on. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
