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The function of the earth wire in an extra high voltage line is to

  • The function of the earth wire in an extra-high-voltage line is to provide a shield to the phase conductors from a direct lightning stroke.
  • The primary function of the earth wire, also known as the shield wire or overhead ground wire, is to provide a low-impedance path to ground for lightning strikes or other high-voltage surges that may occur on the transmission line.
  • This helps to protect the phase conductors and other equipment on the transmission line from overvoltage damage.
  • In the event of a lightning strike or other surge, the earth wire conducts the surge current to the ground, which helps to prevent the phase conductors from experiencing the full force of the surge.
  • This helps to reduce the risk of insulation damage or equipment failure due to overvoltage.
  • Additionally, the earth wire also helps to reduce corona discharge and radio interference on the transmission line, as it provides a grounded shield around the phase conductors.