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Power systems miscellaneous
  1. The leakage resistance of a 50 km long cable is 1 MΩ. For a 100 km long cable it will be
    1. 1 MΩ
    2. 2 MΩ
    3. 0·5 MΩ
    4. none of these
Correct Option: D

Leakage Resistance,

R =
ρ
In
R
2πlr

R ∝
1
l

where, l = length of the cable
∴
R1
 =
l2
R2l1

R2 = R1
l1
 = 1 mΩ
50
l2100

= 0.5Mω


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