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Doctors Medicines MCQs Q&A

  1. Pulse less
  2. Flow corona
  3. Reamer corona
  4. Straight line
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1 Answers

Option 1 : Pulse less

Corona Formation:

  • The ionization of air surrounding the high voltage transmission lines causing the conductors to glow, producing a hissing noise, is called Corona Discharge or Corona Effect.
  • In transmission lines, conductors are surrounded by the air.
  • Air acts as a dielectric medium. When the voltage of air surrounding the conductor exceeds the value of 30kV/cm, the charging current starts to flow through the air, which causes the air to be ionized.
  • The ionized air act as a virtual conductor, producing a hissing sound with a luminous violet glow known as the corona.
     

Corona in EHV transmission line:

  • Pulseless corona is one of the types of corona discharge that takes place in EHV transmission line conductors.
  • The corona current pulses generated by corona discharge are the sources of radio interference from transmission lines.
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