Patent GB-179189-A (GB)
Title: Improvements in phase-increasing apparatus employed for example to supply current rectifying devices
IPC: H02K47/30
Filed: 1922-04-28
Abstract: 179,189. Simms, W. H., (Bureau d'Organisation Economique, Soc. Anon.). April 28, 1922. Phase, changing; polyphase transformers; vapour apparatus, arrangements of.-A phaseincreasing transforming device for supplying current to a vapour rectifier with multiple anodes, or for other purposes, comprises secondary windings connected both in star and in polygon, at least two non-parallel sections of the polygonal winding being placed between any two branches of the star winding. One arrangement for obtaining the eleven secondary phases from a twophase supply is shown in Fig. 2. The star-connected windings OA - - OD and the polygonal windings 11<1>, 12<1>, &c. are arranged on the two cores of a two-phase transformer, all the windings shown in a vertical position being on one core, and those shown horizontally on the other core. The secondary phases are obtained from the points 1 - - 11 on the polygonal winding, which may be connected to the anodes of a rectifier, the central point O of the star being connected to the cathode through the direct-current circuit. The polygonal winding may be arranged to include two or more series of terminals with the same instantaneous potentials, for the purpose of supplying two or more rectifiers in parallel. An example of this arrangement is shown diagrammatically in Fig. 4, in which the points 1 - - 12 of the polygonal winding have the same potentials as the points 1<1> - - 12<1>, the winding being used to supply two twelve-anode rectifiers in parallel. The windings are arranged on two cores energized by a twophase primary winding, each of the polygonal secondary windings comprising coils on both cores. In another arrangement, Fig. 5, the polygonal secondary winding 5 is wound on a single magnetic circuit, in which a rotating field is produced by the primary winding 1 connected to a three-phase supply at the points 2, 3, 4. The star-connected windings 6 are connected to opposite points of the winding 5, the middle points of the windings 6 being connected together at the point 7 which is connected to the negative side of a direct-current load 10' fed through the rectifier 10. In Fig. 6 is shown part of a winding lay-out for a construction employing a single magnetic circuit in which the flux frequency may be below the primary frequency. The star-connected primary and secondary windings are arranged as in the stator of a polyphase alternator, the primary windings being connected to a neutral point 17<1> and receiving current from terminals 11. The star-connected secondary windings 12 are connected to a neutral 15 and to points on the polygonal winding 13 as shown. The secondary phases are obtained from terminals 14 on the winding 13. In another modification, additional windings are branched off from points of the polygonal winding to give intermediate phases, an example of such an arrangement for giving forty-two secondary phases from a threephase supply, being shown in Fig. 7. These additional windings may be mounted on an independently-excited auxiliary transformer. Another arrangement for obtaining twenty secondary phases from a two-phase supply is shown in Fig. 8. The Specification as open to inspection under Sect. 91 (3) (a) describes another arrangement, Fig. 4 (Cancelled), in which the polygonal winding provides two series of terminals A - - F, A<1> - - F<1>, having the same potentials, for feeding two six-anode rectifiers in parallel. This subject-matter does not appear in the Specification as accepted.