Some of the advantages and disadvantages of oil filled cables are listed below:
Advantages:
- Smaller overall size and smaller weight for given voltage and kVA rating due to reduction in the thickness of the dielectric required
- No ionization, oxidation and formation of voids
- More perfect impregnation
- Smaller thermal resistance due to decrease in the dielectric thickness, so higher current rating
- More maximum permissible stresses
- Fault identification is easy
Disadvantages:
- Greater cost
- Complicated laying of cables and maintenance