| 摘要 |
PROBLEM TO BE SOLVED: To prevent an overcurrent from flowing to a cross flow detector due to mechanical delay of a contactor.SOLUTION: A cross flow detector 20 includes cross flow current detectors 21, 22 for detecting a cross flow, flowing only between inverters 11 connected in parallel, and outputting to a control section 12 for controlling the inverters 11, and a contactor 24 for cross flow detection protecting the cross flow detector 20. An auxiliary power supply device 10 includes the inverter 11 for converting a DC power into an AC power, the cross flow detector 20 for detecting a cross flow, and the control section 12 for controlling the voltage and phase outputted from the inverter 11, based on the cross flow detected by the cross flow detector 20. If a trunk line abnormality is not generated after a contactor 50 for load is closed, the control section 12 outputs a closing command to the contactor 24 for cross flow detection.SELECTED DRAWING: Figure 1 |
