Abstract
A PAPER was read on this subject in London recently before the Institution of Electrical Engineers by J. L. Carr, in which the author briefly reviewed the methods employed for the centralized control of switching operations on distribution networks, by the injection into the distribution system of currents the frequencies of which differ from that of the main supply. The superimposition of ultra-audio frequencies for limited and specific purposes, such as the protection or the remote switching of a transmission line, has not, so far, been employed to any large extent in Great Britain, and is therefore not considered. Several devices employed to respond to injection currents are briefly described, and the probable applications of this method of control are outlined. Particulars of the development of remote signalling over the network of a large electricity supply undertaking are given, together with reasons for the final adoption of the method selected. Data of the components of the equipment are given, and the power required is analysed for two frequencies.
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Remote Switching by Superimposed Currents. Nature 153, 708 (1944). https://doi.org/10.1038/153708b0
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DOI: https://doi.org/10.1038/153708b0