| 摘要 |
PROBLEM TO BE SOLVED: To detect a single operation only at an accident of an interconnected system.SOLUTION: A device of detecting a single operation of a distribution type power supply converting a DC power outputted from a DC power supply 200 into an AC power and supplying the AC power to a system 300 and a general load 400, comprises: a zero-cross point detector 152 detecting a zero-cross point of the AC voltage of the interconnected system 300; a period measurement part 154 measuring a time period between the zero-cross points; a phase leap recognition part 158, in a case where the measured time period between the zero-cross points is shifted to an average period calculated from the plurality of time periods between the zero-cross points by a certain time period or more, recognizing that abnormalities occur in the interconnected system 300; and an operation continuity determination part 160 determining a single operation in a case where such recognition that abnormalities occur in the interconnected system 300 is consequently made a certain number of times or more, and determining a continuous operation in a case where the above recognition is not consequently made a certain number of times. |
