| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and reliable power supply system capable of suppressing a three phase unbalance current on a power system side to the minimum extent. SOLUTION: Alternate and direct current conversion systems 5 to 8, 8' which convert three phase alternate current power into direct current power and convert the direct current power into single phase alternate current power are connected with a transformer 2 for feeding which converts three phase alternate current power on a power system 1 side into single phase power to supply it to feeding circuits 3, 4 in parallel to compensate an unbalance current on the system side generated in the transformer for feeding 2 by the alternate and direct current conversion systems to turn it into a three phase balance current. Moreover, when the feeding circuit 3, 4 cause an overload, a current by a value exceeding a rated current flows into the transformer 2 for feeding having larger overcurrent withstand amount when compared with the alternate and direct current conversion systems to avoid protection stop of the alternate and direct current conversion systems and realize more reliable power supply. |
