Article | REF: D4440 V1

Crown effect on overhead power lines

Author: Claude GARY

Publication date: February 10, 1998

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1. Physical aspects of the AC voltage phenomenon

1.1 Nature of the crown effect

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1.1.1 Electronic avalanche

The corona effect refers to all the phenomena associated with the appearance of gas conductivity in the environment of a conductor subjected to high voltage.

This conductivity is due to the phenomenon of ionization, which can be explained as follows:

There are always a certain number of positive ion - free electron pairs in the air, created by cosmic radiation or natural radioactivity....

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Physical aspects of the AC voltage phenomenon
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