What causes the noise emitted from high-voltage power lines?

 



Answer. Posted on Sunday, November 9, 2014.

The noise emitted from high-voltage power lines is caused by the corona discharge of energy that occurs when the electrical field strength on the conductor surface is high enough to form a conductive region, but not high enough to cause electrical breakdown to nearby objects. It is often seen as a glow in the air adjacent to pointed metal conductors carrying high voltages.

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2 thoughts on “What causes the noise emitted from high-voltage power lines?

  1. Guessing. There is an alternating current in the lines causing an alternating magnetic field around the lines. Although the distance between the lines is great enough to not gravely limit the current in the other lines, they are close enough together to cause a vibration in the other lines.

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