GB1245741A - Improvements in rectifier assemblies - Google Patents

Abstract

1,245,741. Rectifier assemblies. ENGLISH ELECTRIC CO. Ltd. 16 July, 1968 [18 July, 1967], No. 32843/67. Heading H1K. [Also in Division H2] A rectifier assembly comprises, for each phase, a plurality of pairs of bus-bars each with a plurality of diode rectifiers distributed along their length and connected in parallel between them. The current inputs and outputs to the bars are positioned thereon intermediate the ends in such a way as to reduce variations in loading between individual cells to a minimum. Several externally commoned inputs and outputs to each bar may be used if required. In the thre-phase arrangement shown in Fig. 3, with 14 diodes between each pair of bus-bars and a single input and output to each bus-bar, the optimum positioning commensurate with the need to dispose the connections between pairs of diodes is as shown. The diodes are clamped to one finned bus-bar and are connected to the other, which is thinner and therefore more resistive, through individual fuses F. Conductor 5 forms a common output conductor for all phases. Where there are a plurality of input conductors for each phase these are preferably strapped together adjacent the bus-bars, especially when the rectifier banks are linearly arranged in phase order RR, YY, BB. Closer balancing of the current distribution may be achieved by inserting impedances in series with individual diodes or by varying the section of the bus-bars as by local reinforcements or sawcuts.