| 摘要 |
PURPOSE:To obtain a common transformer by a method wherein three windings of the secondary are connected in delta and output lines of single-phase three- line system are drawn out from two intermediate taps provided to two windings of three and the junction of those two windings and output lines of three-phase three-line system are drawnout from three junctions of three windings. CONSTITUTION:Secondary windings 11', 12', 13' of a transformer are connected in delta and intermediate taps 21', 22' are provided to two windings 11', 12' of them. Then voltage lines (u), (v) of electric lamp lines of single-phase three-line system are drawn out from the taps 21', 22' and a neutral line (n) with an earth point 6 is drawn out from the junction V of the windings 11', 12' and the power is supplied to a single-phase load. A voltage line S, which has an earth point 5, of power lines of three-phase three-line system is also drawn out from the junction V and from other junctions U, W voltage lines R, T are drawn out and the power is supplied to a three-phase load. The power can be supplied at the same time to the loads connected to the single-phase three-line system electric lamp lines with a grounded neutral and the three-phase three-line system power lines with one phase grounded by one transformer without reforming the circuit. |
