Direct generation of alternating current at high voltages

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Abstract
The authors begin by pointing out, with the help of a mechanical analogy, the true place which the alternating current transformer takes in the group of plant considered to-day to be standard for the generation, transmission and distribution of electric power on a large scale.They propose the use of high-voltage alternators and the partial abolition of transmforers. In support of these proposals, the authors discuss the gradual growth of conditions favourable to the introduction of the high-voltage alternator, and describe the obstacles in the way of further development at lower voltages.This discussion leads naturally to the advantages to modern alternator design to be derived from the acceptance of the principle of direct generation at high voltages.This discussion leads naturally to the advantages to modern alternator design to be derived from the acceptance of the principle of direct generation at high voltages.Apart from the design of the alternator itself, including its cable leads, there are many ways in which the adoption of such an alternator would effect financila economy in capital outlay and running expenses, and these matters the authors proceed to set out.They then taken a brief survey of what has already been done in the past in the field of direct generation at 30000 volts, and describe in detail a 33000-volt, 25000-kW, 3000-r.p.m. alternator of unique design, built for the North Metropolitan Electric Power Supply Co., for installation in the new power station at Brimsdown, North London. The operating experiences on site since the setting to work of the alternator in August 1928 are stated.As a matter of interst to those engineers and designers engaged in alternator construction and development, and outline is given of some of the experimental research carried out by the authors in the working out of the practical details of the new design, and of the tests made at works on the completed alternator.The paper concludes with some reference to the future possibilities of the extended use of direct generation at high voltages, and the authors ask for a candid expression of opinion from their critics.

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