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why humming sound occured in HT transmission lines.
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Answer Posted / tameshwar singh
At very high voltage the molecules across the conductor are
get ionnised and at certain level of voltage the air gets
breakdown and act as conducting medium, this voltage is
known as Disruptive critical voltage. At this voltage
arcing is formed across conductor & due to this phenomenon
hissing noise will occurs. This noise causes the radio
interferance in communication lines
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