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HVDC Power Transmission Electrode Siting and Design

机译：高压直流输电电极选址设计

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A monopolar line configuration using earth as the return conductor is projected211u001eto reduce capital costs per megawatt as much as 20% compared to a bipolar line. 211u001eHowever, full time use of earth in this manner is prohibited by the National 211u001eElectric Safety Code (NESC) due to the threat to human (and animal) safety in the 211u001eform of step-and-touch voltages. Also, large direct currents (typically ranging 211u001ein thousands of amperers) could be responisible for corrosion and other forms of 211u001e'interference' to underground facilities; viz. pipes, cables, etc. Presumably, 211u001esuch problems would be virtually eliminated if the current could be forced to 211u001eflow only deep inside the earth. This report begins with a review of the 211u001efundamentals associated with current conduction in earth, including the various 211u001etechniques available for measuring the earth's electrical properties. The sources 211u001eof existing data are discussed and some specific data for selected regions of the 211u001eU.S. and Canada are reviewed as examples. Electrode technology and design issues 211u001eare reviewed and recent experience gained by New England Power and Hydro-Quebec 211u001eis discussed.

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