Fair-Weather RI, Part I: Artificial and Natural Sources

Based on the present state of the art a simplified picture depicting the characteristic of corona plumes and RI generation from EHV line conductors during fair weather is presented. An artificial source was developed to simulate some natural sources that were identified in the field insofar as plume and RI generation are concerned. By means of the artificial source, a prediction is made on the RI levels expected from UHV transmission lines. The prediction is based on laboratory test results from the artificial sources on conductors of different diameters but presumes the same number of sources per mile of UHV line as for EHV lines. Further investigations are required to verify this assumption.