GB252003A - Improvements in electric current converting systems - Google Patents

Abstract

252,003. British Thomson-Houston Co., Ltd., (Assignees of Mittag, A. H.). May 9, 1925, [Convention date]. Vapour apparatus, arrangements of.-An alternating-current load circuit 9 is supplied from the secondary winding 8 of a transformer, the primary 7 of which is divided into two parts oppositely connected through metallic vapour devices 5, 6 to a direct-current supply source 1, 2. The metallic vapour devices 5, 6 are alternately rendered operative to produce an alternating current in the winding 8 by means of starting anodes 12 co-operating with the cathodes 11 and energized by transformers 22 the primary windings of which are alternately connected to a battery 19 by brushes 23, 24 co-operating with the conducting segment 18 of a commutator switch 16. Frequency is determined by the speed of the driving motor 13 of the switch 16, and the main anode current of the metallic vapour devices is commutated by a condenser 26, a reactance 25 being provided in the supply circuit to prevent momentary fluctuations of current during commutation. According to a modification, Fig. 2, control of the vapour devices is effected electrically, the starting anodes 12 being connected through valves 20 to oppositely-connected halves of the secondary winding of a transformer 27, the primary of which is connected through a condenser 31 to the output terminals of the main transformer, frequency being determined by the saturation of the main transformer and by the condenser 31.