Circuit arrangement for supplying power from a three-phase mains to a single-phase load

摘要

1,043,917. Symmetrical current conducting arrangements. ALLGEMEINE ELEKTRICITATS-GESELLSCHAFT AND DEUTSCHE EDELSTAHLWERKE A.G. July 19, 1963 [July 23, 1962], No. 28682/63. Heading H2H. In order to maintain a balanced load on a three-phase supply R, S, T when a variable single-phase load 1-such as an induction furnace-is connected thereto these are provided in a number of capacitors 4-7 and an inductor 3, the inductor 3 being permanently connected to phases R, S and the capacitor 4 to phases S, T whilst the capacitors 5-7 are connectable by means of change-over switches 8-10 either to phases S, T as shown when the load has a maximum value or selectively to phases R, S, i.e. in parallel with inductor. 3, when the load has any value less than its maximum. The switches 8-10 may alternatively comprise pairs of single pole switches. Capacitors 2 are provided for power factor improvement.