A. increase the sag
B. reduce the vibrations at the point of support
C. reduce the tension
D. all of the above
Answer: B. reduce the vibrations at the point of support
Explanation:
Stockbridge damper is used to control or suppress the wind-induced vibration of overhead conductors.
The Stockbridge damper targets oscillations due to aeolian vibration; it is less effective outside this amplitude and frequency range.
Stockbridge dampers are devices extensively used to reduce vibration amplitude on electric lines due to wind, avoiding the risk of fatigue on the line.
The damper is designed to dissipate the energy of oscillations in the main cable to an acceptable level. Its distinctive shape gives it the nickname “dog-bone damper“.
These dampers are used to counteract vibrations excited by wind, so-called Karman vibrations.
Due to unequal ice loading vibrations are produced in the conductors.
If these vibrations are extended up to the point of support of the conductor, bolts and nuts are loosen, finally producing fault in the system.
Therefore, to reduce these vibrations at the point of support, vibration or stock bridge dampers are used.