How Vibration Damper Works in Transmission Line?

How a Small Size Damper Reduces Vibration in Transmission Lines?

Vibrations dampers are usually used in high voltage and extra-high voltage electrical energy overhead transmission line to handle aeolian and galloping or dancing vibrations in the transmission lines conductors. The dampers are designed such a way that they attenuate the line vibrations by reaching the same frequency as the cable that has wind-induced vibrations.

The overhead Transmission Line mainly experiences two types of vibrations in a vertical plane which can be categorized into two groups.

  • Aeolian Vibration;
  • Galloping or Dancing vibration.

Aeolian Vibration is having a high frequency and low amplitude at very low velocity (4 to 15 km/hr) of wind, like- vibration frequency 5 to 40 cycle/second and the amplitude is 2 cm to 5 cm with a loop length of 1 m to 10 m. 

Galloping or Dancing Vibration is having self exited type a low frequency but higher amplitude, like- 1/4 – 3/2 cycle/second and amplitude of vibration around 10 m.

The Vibration Phenomena in Transmission Line is solved by using specially designed dampers called Stockbridge Damper that is basically a device to absorbed vibration energy and prevent vibration in Transmission Line.

Stockbridge Damper

Stockbridge Damper


The Stockbridge damper was invented in the 1920s by an engineer George H. Stockbridge, as per his name it is called Stockbridge. In early Stockbridge damper used concrete as damper mass material, nowadays it uses some heavy metal.

As in figure right end, Stockbridge Damper has two masses at the ends of a connecting rod or stiff cable which gives it a dumbbell shape. It is connected to the line conductor immediately above it through a clamp. They can effectively damp out Aeolian wind vibrations.

See video what actually happen during conductor vibration

Stockbridge Dampers absorb vibrational energy and thus prevent the formation of standing waves which can cause serious stress fatigue to the energy transmission line and damage it. 


Spiral Vibration Damper

Smaller diameter  (less than 0.75") conductors like shield wire or optical ground wire (OPGW), a Stockbridge damper is not suitable rather a different type and the more effective damper are available named Spiral Vibration Damper

The Spiral Vibration Damper has been used successfully for over last few decades to control Aeolian Vibration on these smaller sizes of overhead transmission line conductors and wires.

Spiral Vibration Damper
Spiral Vibration Damper

Spiral vibration dampers have a helically-formed damping section sized for the interplay of damper and cable to provide the action/reaction motion such that they impact during Aeolian vibration activity that absorbs the natural vibration wave.


  1. It is really a helpful blog to find some different source to add my knowledge. I came into aware of new professional blog and I am impressed with suggestions of author. Squat Rack

  2. Thank you very much, it really help and teach me something.


Thank you very much to visit and valuable comments on this blog post. Keep in touch for next and new article. Share your friends and well-wisher, share your idea to worldwide.

You may like the following pages