Comparative Studies on Different Laboratory Investigations of Ionic Current Environment of HVDC Lines
Corona on HVDC transmission lines generates the ionic current and electric field environment under the transmission lines. The corona generated ionic current are drifts towards the ground causes electric shock to the any living organism which present under the transmission lines. In view of this designing of HVDC transmission lines at EHV/ UHV levels plays a vital role. The magnitude of these ionic current flows under the transmission lines depends on the line design considerations. Therefore, the major factors which affect the magnitudes of ionic currents are applied voltage, conductor diameter, space between lines to ground etc. Not only the design factors, but atmospheric parameters such as atmospheric temperature, pressure, humidity etc. are also have profound influence on generation of ionic current magnitudes under the lines. This authenticates that, need of significant studies on corona generated ionic currents under the HVDC lines before designing the new DC lines at EHV/UHV levels. In view of this authors are conducted different laboratory investigations on corona generated ionic current of HVDC lines at indoor and outdoor climatic conditions. Therefore, this paper presents the different laboratory experiments conducted for different conductor diameter in indoor and outdoor weather conditions. Also, this paper discussed the different observations during the measurements observed at different weather conditions.