Under Following conditions Ferranti effect occurs:
Under Following conditions Ferranti effect occurs:
1. When there is no load on transmission line (IL = 0)
2. When There is no load at receiving sub-station or Lightly loaded
3. When there is sudden load thrown OFF.
4. When there is sudden load shading.
5. When Transmission line is open circuited due to load failure.
Ferranti effect : Under any one condition, it is found that receiving end voltage (VR) is found to be greater than sending end voltage (VS). This phenomenon is known as Ferranti effect.