A New Type of 500 kHz Measuring Instrument for Long-Term Recording of Radio Interference from Electric Power Lines

The report describes an instrument for the continuous recording of RI current and electromagnetic field at 500 kHz, due to coro na effect on EHV and UHV lines. The instrument, which was constructed at the laboratories of ENEL's Automatic Re search Control Center (CRA), was planned with a view to its being used in the near future for experimental research on a UHV line at present under construction, for which it is planned to have centralization and automatic recording of the mea. sûrement data by means of a data-logger.