Stock bridge dampers are used in case of hilly areas so as to overcome:
- Increase power factor
- Unequal ice loading
- Increase string efficiency
- All of these
Correct answer: 2. Unequal ice loading
Explanation:
Stockbridge dampers are used in transmission lines, especially in hilly or windy areas, to overcome the problem of unequal ice loading. Unequal ice loading can lead to vibrations and oscillations in the conductors, which can potentially damage the transmission lines.
Stockbridge dampers consist of masses (typically made of steel) suspended on each side of the transmission line, connected by flexible cables or rods. These dampers help to dissipate the energy generated by the oscillations in the line caused by wind or ice, reducing the amplitude of the vibrations and preventing damage to the conductors.
The other options mentioned (Increase power factor and Increase string efficiency) are not directly related to the purpose of Stockbridge dampers. The primary function of Stockbridge dampers is to mitigate the effects of wind-induced or ice-induced vibrations in the transmission lines, ensuring the reliability and longevity of the infrastructure.