COMPARISON OF OVERHEAD AND UNDERGROUND CABLE
·
The distribution system can be over head or
underground. The choice between overhead and underground system depends upon a
number of widely differing factors. Therefore,
it is desirable to make a comparison between the two.
|
S.NO
|
OVERHEAD
LINE
|
UNDERGROUND
CABLE
|
|
1.
|
Only bare conductors are used in open place
|
Insulated conductors are placed in underground
|
|
2.
|
Not very safe
|
More safe
|
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3.
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Conductor size is small
|
Conductor size is large
|
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4.
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Fault occurs due to atmospheric conditions such as snow, severe rain,
storms, lightning, fires, tree touching, etc.
|
Chances of fault are very rare
|
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5.
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Insulation cost is less
|
Insulation cost is more
|
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6.
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Conductor is less expensive
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Conductor is costlier
|
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7.
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Easier expansion and replacement is possible
|
Expansion is difficult
|
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8.
|
Low initial cost
|
High initial cost
|
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9.
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Fault detection is easy
|
Fault detection is difficult
|
|
10.
|
Causes interference with communication lines
|
No such problems
|
|
11.
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it is used for long transmission
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Due to charging current it is not used for long transmission
|
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12.
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Appearance is not good
|
It gives better appearance
|
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13.
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Useful life time is less
|
Useful life time is two times that of O.H lines
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