A comparative study of space charge effects on corona current using an indoor corona cage and a monopolar test line

The effect of space charge was investigated through corona current measurements. The tests were carried out in an indoor corona cage with and without aluminium foil cover, and on a monopolar test line with a high speed fan to simulate and assess the effect of wind on the space charge. The results obtained demonstrated that the corona current in the cage and the test line is more dependent on conductor voltage and resistance of the air gap. It has also been shown that the blowing of the wind on a test line conductor and the assisted draining away of charge carriers from the corona cage gap had the effect of reducing corona current.