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
and modes. There are two types of vibrations in vertical plane,
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.
may result in breaking
of strands and mechanical
failure of conductors.
2- Galloping or dancing of conductors
galloping means dancing of conductors at the low
frequency and high
are the oscillations of complete span of conductors.
It causes the longitudinal movement of conductors through
the conductors clamps.
affecting conductor vibrations
The various affecting the vibrations of conductors are :
Atmospheric conditions like icing, rain and high wind
Span of conductor
Tension in conductor
Types of clamps used
of the towers
Number of dampers used and their locations
Some other factors depending on electrical and electromagnetic
phenomenon like corona
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.
Power Transmission And Distribution By M.V.Bakshi U.A.Bakshi
(pages 48, 49,50)