Experimental Evaluation of Instruments for Measuring DC Transmission Line Electric Fields and ION Currents

In the fall of 1979, the newly formed Dc Field and Ions Working Group of the Corona and Field Effects Subcommittee sponsored a field program for the purpose of evaluating and comparing various instruments available for measuring electric field and ion current in the vicinity of hvdc transmission lines. In total, 9 separate field meters and 5 separate ion current meters were used. Results of the field program demonstrate the difficulties of making accurate measurements in an outdoor environment with presently available instrumentation.