Electrical Revolution: Advantages of Under Ground Cable Over Transmission Line

The possibility of breaking of cable is reduced.
The maintenance cost of underground cable is very low because of less chances of fault occurrence.
The inductance of the cable is low whereas the capacitance is comparatively high because of low space between cables.
The sheath of cable absorbs surge energy therefore its effect is negligible.
No interference with communication lines if it is placed at 90 degree with respect to communication line cable.
There is less interruption of supply because the cable is not affected by severe weather, lightning conditions.
There is no sag problem as well as not affected by wind, ice and higher temperature.

The laying of underground cable is more costly as compared to transmission line.
As the transmission line voltage increases, the cost of cable increases.
Location of fault finding is not very easy.
The cable draws high charging current because it has high capacitance due to less spacing between them.
Once the route of cable is fixed, it is not very easy to extend from intermediate point of cable.
Tapping as well as joining of cable is difficult.

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