An electrical discharge characterized by a corona and occurring when one of two electrodes in a gas has a shape causing the electric field at its surface to be significantly greater than that between the electrodes.电晕放电：以电晕为特点的一种放电，当某气体中的两个电极中有一个的形状导致其表面的电场明显大于两个电极之间的时候所发生电晕放电现象