[Ravi Perera]

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

موضوع

[Hamid]

It is warning alarm for helicopter and other fliers.

[Dr.D]

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

[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.

[نویسنده]

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