Mesure des champs électriques et des courants ioniques dessous les lignes de transport aux très hautes tensions continues

Describes the principle of operation and the physical details of a device for measuring electric fields and ionic currents caused by very high voltage d.c. transmission lines. The authors present results of measurements made under different conditions, and compare them with theoretical results. The measuring apparatus was subjected to testing for a period of about a year and a half, under different climatic conditions, under the experimental line at IREQ. The results obtained show the suitability of this equipment for long-term tests under all climatic conditions.