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Electrical question no.18 – Electrical HV Transmission lines

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  • #173
    Ravi Perera

      Dear,
      Why the shape of ball type items are fixed on earth screen cables top of power transmission lines? Please Explain?

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    • #1365
      Hamid

        It is warning alarm for helicopter and other fliers.

        #1593
        Dr.D

          It is a housing that covers a vibration damper to reduced wind driven vibration of the line.

          #1596
          Hamid

            That mentioned ball cannot damp vibration of wire; in opposite creation of vibration due to wind resistance is one of its disadvantages. Please note, we usually see that warning ball on transmission line in crossing autobahn which the emergency landing of airplanes or other flyer is possible.

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