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Which of the following is NOT an advantage of oil filled cables over solid cables?
1. The possibility of formation of voids is eliminated.
2. The maximum allowable stress increases.
3. Installation and maintenance is straight-forward.
4. More perfect impregnation can take place.

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Correct Answer - Option 3 : Installation and maintenance is straight-forward.

Oil filled cables have the following advantages against solid cables:

  • The oil filled cables have greater operating dielectric stress.
  • Such type of cable has greater working temperature and greater current carrying capacity.
  • Oil filled cable has better impregnation as compared to solid cable.
  • In oil-filled cable, impregnation is possible, even after sheathing.
  • In such type of cable, there is no void formation.
  • The size of oil-filled cable is small as compared to solid filled cables because their dielectric thickness is less.
  • In oil-filled cable, the defect can easily be detected by oil leakage.

 

So, Installation and maintenance is straight-forward is not the advantage of Oil filled cables.

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