Corona characteristics of conductor bundles under impulse voltages

This paper presents the results of an experimental study on the corona characteristics of single and bundle conductors under impulse voltage conditions in a large cage. Both lightning and switching impulses were used for the tests, most of which were performed with positive impulses. The influence of artificial rain on the corona characteristics was also studied. An analysis of the experimental results is presented with emphasis on the corona onset voltage gradient, the apparent change in the capacitance of the line conductor and the energy dissipated by corona. A simple analog circuit is suggested to simulate the influence of impulse corona on waves propagating along line conductors.