| 摘要 |
PURPOSE:To continuously supply stable power to a load by reducing the detection level of an overcurrent detector of the other AC stabilized power source under the opening condition of a breaker provided at the output side of one AC stabilized power source. CONSTITUTION:If an AC stabilized power source 4 falls in a trouble when AC stabilized power sources 3, 4 are operated in parallel through high speed breakers 5, 6 to supply power to a load, the trouble of the power source 4 is detected by a trouble detector 13, and the breaker 6 is opened by a breakage command of the detector 13. The power source 3 supplies a load current to a load 9 and a cross-current to the power source 4 at this time; an overcurrent detector 14 responds only to the load current of the load 9, but does not respond to the cross-current to the power source 4. Thus, if the load current of the load 9 is of an overcurrent detecting level or lower, the overcurrent detector does not respond, and the power source 3 can continuously supply power to the load 9. |
