MEJORAS EN LAS REDES DE DESPLAZAMIENTO DE FASE PARA SISTEMAS POLIFÁSICOS

摘要

592,374. Converting ; phase changing. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. May 10, 1945, No. 11748. Convention date, May 23, 1944. [Class 38 (ii)] In a system interconnecting a D.C. and a polyphase A.C. circuit 11, 10 comprising a number of pairs of alternately conducting valves of the make-alive type 1A 4A; 2A, 5A; 3A, 6A; impulses to the ignition electrodes 16 are supplied through impulsing networks 17 and unidirectional conductors 21, 22 from secon.- daries 25 of transformers, each having two primary windings 26, 27 supplied from mutually phased displaced sources, the phase of the output impulses being varied by changes in the primary currents. By connecting primaries 26 in delta and primaries 27 in star to the starconnected secondaries of a three-phase transformer 18 supplied from the A.C. line 10, each primary 26 receives a supply 150 degrees phasedisplaced from that of the corresponding primary 27. The phase of the flux and, therefore, of the output impulse is determined by the vector sum of the supplies to primaries 26, 27 and is varied by altering the magnitude of the primary currents by variable resistors 30 in the leads to the delta connected group 26, and a variable resistor 31 in the connection between the starpoints 29, 28 of the transformer 18 and the star-connected group 27 by a handle 32.