GB818600A - Improvements in or relating to alternator-rectifier-electrical generating system - Google Patents

Abstract

818,600. Supply systems depending on variable speed generators; automatic voltage and current control systems. LEECE-NEVILLE CO. Oct. 30, 1956, No. 33106/56. Class 38 (4). An alternator-rectifier generating system has a load which includes a battery 14 connected to the alternator by way of a load relay, the operating coil of which is connected to the alternator by way of a number of control resistors. A generating system 10 comprising a star connected three-phase alternator 11 feeding a load 14 through a full wave rectifier 12 has a voltage control relay 18, and a current control relay 19 and a load relay 17, the operating coil 41 of which load relay is energized from the alternator over a circuit which includes a set of resistors 20 and some of the cells of the rectifier 12, energization of the coil 41 causing contacts 15, 16 to close in order that current may be supplied to the load 14. In other embodiments two resistors only, instead of three, as shown, at 20 in Fig. 1, are used. In all the embodiments however, whether two or three resistors are utilized in the energization of the operating coil 41, the battery 14 is at no time able to cause energization of the coil 41 because those cells of the main rectifier which do not form part of the circuit over which the coil 41 is energized by the alternator form blocking cells to any current which tends to flow from the battery 14 to the coil 41.