Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

corona
a visible glow discharge which emanates from high-voltage conductors in regions of extremely high electric field intensity.
corona effect
flow of electrical energy from a high-voltage conductor to the surrounding ionized air. This effect only becomes significant for potentials higher than 1000 V. This effect is characterized by a faint glow, a crackling noise and conversion of atmospheric oxygen to ozone.
corona loss
the electric power lost in high voltage lines due to the radiation of energy by corona discharge.

See corona
corona resistance
capacity of a material to bear the action of the corona effect. This capacity is particularly important for polymeric materials, which have to withstand the chemical degrading effect promoted by ozone generated by the corona effect.

See corona effect
corona ring
a toroidal metal ring connected to discontinuities on high-voltage conductors to reduce local field intensity and thus discourage the formation of corona discharge.
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