14 Difference Between Overhead and Underground Cables

Sr. No.	Overhead Cable	Underground Cable
1	It carries a higher risk.	It’s more secured.
2	It’s simple to identify a problem.	In comparison to overhead, fault detection is difficult.
3	It seems to have a dusty appearance.	It has a nice appearance because the cables are hidden.
4.	It is less economical.	It is more expensive..
5.	Maintenance is required on a routine basis.	Maintenance is only conducted on a casual basis.
6.	Accidents seem to be more frequent.	There are very few chances of an accident.
7.	It seems to have a voltage level of 400 kv.	Due to the difficulty in shielding it, it can only work at 66 kv.
8.	In comparison, the cost of erection is much lower.	The cost of erecting a high-voltage cable is quite huge.
9.	This is for long-distance connections.	Long-distance transmission is restricted by the high charging current at high voltage.
10.	Falling trees and other things have an effect on the line.	There is really no chance.
11.	The current carrying capacity of an overhead line is greater than that of an underground cable.	In comparison to an overhead line, an underground cable has a lower current carrying capacity.
12.	It needs less insulation.	It needs extra insulation.
13.	Overhead lines are unaffected by the proximity effect.	The underground wires are affected by the proximity effect.
14.	The overhead system seems to have a Corona effect.	The underground system does not have the Corona effect.