| 摘要 |
PURPOSE:To obtain an uninterruptible different power supply switching system in which the safety is enhanced by making it possible to take a protective countermeasure. CONSTITUTION:When power is fed from a normal power supply 1 to a load 4 by switching a section of a distribution line 2 without interrupting power supply, a section switch 3b inserted into the distribution line is connected in parallel with a switch 25 being operated electrically. The switch 25 is controlled by means of an operation control 26 comprising a phase detecting circuit 10, a manual throw-in circuit 27 with synchronous interlock, and a manual trip circuit 29. |
