Question
Tue November 15, 2011 By: Ct&j Marygiri

WHY DO WE HEAR A BUZZING SOUND WHEN WE STAND UNDER A HIGH POWER LINE?

Expert Reply
Wed November 16, 2011
 Basically, we hear buzzing sound due to corona discharge. The strong electric field at the surface of a high voltage power line conductor ionizes the nearby air and causes a partial breakdown of its dielectric strength. The audible noise we hear is caused by the local sound-pressure level changes due to the individual corona discharges that in turn occur as part of electron avalances. During wet weather the noise level is much higher due to the presence of drops of water on the underside of the conductors. These weather drops break up and the departing portions cause discharges in the water-to-water gap.
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