HVDC Visual Corona and RIV Testing on Insulators and Conductor Samples

This paper deals with the problems arising during laboratory investigations of the corona behavior of HVDC overhead line components. In this connection the results of dc RIV and visual corona tests performed on smooth and stranded conductors and on disk insulator units and strings at voltages up to 1200 kV are presented. Finally, some remarks are made on the most suitable procedures to be adopted for these tests.