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Vibrations of conductors and damper 

Dr. Mohsen niasati


Vibrations of conductors and damper

The conductors are supported on the string insulators at each tower.

Under widely varying atmospheric conditions like strong wind velocities, the conductor can start vibrating mechanically in the vertical plane. Such vibrations can have different frequencies, amplitudes and modes. There are two types of vibrations in vertical plane,

1- Aeolian vibrations

The Aeolian vibrations are high frequency low amplitudes.

These vibrations are not much harmful. But if the frequency of vibrations coincides with the natural frequency of conductors then resonant condition can be achieved.

This may result in breaking of strands and mechanical failure of conductors.

2- Galloping or dancing of conductors

The galloping means dancing of conductors at the low frequency and high amplitude.

These are the oscillations of complete span of conductors. It causes the longitudinal movement of conductors through the conductors clamps.

Factors affecting conductor vibrations

The various affecting the vibrations of conductors are :

  1. Atmospheric conditions like icing, rain and high wind velocities
  2. Span of conductor
  3. Tension in conductor
  4. Conductor configuration
  5. Types of clamps used
  6. Height of the towers
  7. Number of dampers used and their locations
  8. Some other factors depending on electrical and electromagnetic phenomenon like corona

The galloping means dancing of conductors at the low frequency and high amplitude. These are the oscillations of complete span of conductors. It causes the longitudinal movement of conductors through the conductors clamps.

 

Source:

Electrical Power Transmission And Distribution By M.V.Bakshi U.A.Bakshi (pages 48, 49,50)