GB191021041A - Improvements relating to Electric Voltage Regulation. - Google Patents

Abstract

21,041. British Thomson-Houston Co., [General Electric Co.]. Sept. 9. Regulation, automatic systems and apparatus for.-A booster-generator is connected in series with the exciter of a main generator, and a Tirrill regulator is employed to vary simultaneously the field of the exciter and the booster. A generator 1, Fig. 1, is connected to a load circuit 2, 3, 4, and its field core 5 is connected to the exciter armature 8 and the booster armature 9, both armatures being on one shaft. The contacts 14 controlled by the relay magnet 15 are in a shunt circuit round the resistance 12 in series with the exciter field coil 11. The booster has two opposing field coils 17, 19, and the resistance 20 in series with the coil 19 may be short-circuited by the contacts 22 controlled by the relay magnet 24. The relays 15, 24 are wound differentially, one winding in each case being connected permanently to the exciter mains 6, 7, and the other winding being connected to the exciter mains through the contacts 31 of the main regulator. These contacts are controlled on one side by the coil 38 across the exciter mains, and on the other side by the loadcircuit current and voltage coils 37, 39. When the voltage falls below normal, the winding 25<a> of the relay 15 is energized, and the current in the field coil of the exciter is increased. At the same time, the winding 28<a> of the relay 24 is energized, and the current in the field coil 19 of the booster is diminished. The booster field is therefore increased as the current in the coil 17 is unchanged. The exciter and booster thus combine to increase the field of the generator 1. When the voltage rises above normal, the reverse action takes place. In a modification shown in Fig. 2, the booster has one field coil 48, and is driven by a shunt motor 43. The field strength of the booster is varied simultaneously with the field strength of the exciter, so that the two machines aid each other. In a further modification, the resistance in the field circuit of the motor 43 may be cut in and out by a relay at the same time as the exciter and booster field resistances are cut out or in. Specification 14,701/08 is referred to.