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what is the function and use of oil filled cables specify
its advantages and disadvantages
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Answer Posted / gargee
In case of oil filled cables, the channels or ducts are provided within or adjacent to the cores, through which oil under pressure is circulated.
1.1 Advantages
The various advantages of oil filled cables are,
1. The thickness of insulation required is less hence smaller in size and weight.
2. The thermal resistance is less hence current carrying capacity is more.
3. The possibility of voids is completely eliminated.
4. The allowable temperature range is more than solid type cables.
5. Reduced possibility of earth fault. This is because in case of any defect in lead sheath, oil leakage starts, which can be noticed before earth fault occurs.
6. Perfect impregnation is possible.
1.2 Disadvantages
The disadvantages of oil filled cables are,
1. The initial cost is very high.
2. The long length are not possible.
3. The oil leakage is serious problem hence automatic signalling equipment is necessary.
4. The laying of cable is difficult and must be done very carefully.
5. Maintenance of the cables is also complicated.
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