Influence of Air Particulate Matter on DC Corona Discharges with an Indoor Corona Cage and a Monopolar Test Line

Study on corona discharge of transmission lines has been widely concerned by the scholars for decades. As the development and construction of UHVDC projects in recent years, factors which affect the corona characteristics of conductors still has attracted people's attention. Especially the change of the environment, like the appearance of fog and haze phenomenon, has aroused a lot of concern. Air particulate matter is one of the main forms of air pollution, which will affects the electromagnetic environment characteristics of transmission line. In this paper, the influence of air particles on the DC corona discharge characteristics including the inception voltage and audible noise have been investigated. Tests were carried out with an indoor corona cage and a monopolar line, the inner…