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If the height of transmission tower is increased:

This question was previously asked in
PGCIL DT Electrical 22 Aug 2021 Official Paper (SR I)
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  1. the line capacitance and inductance will not change
  2. the line capacitance will decrease and line inductance will increase
  3. the line capacitance will decrease but line inductance will remain unchanged
  4. the line capacitance will increase but line inductance will decrease

Answer (Detailed Solution Below)

Option 3 : the line capacitance will decrease but line inductance will remain unchanged
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Detailed Solution

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Concept:

  • The inductance of a transmission line is independent of the height of the transmission tower.
  • The capacitance of the transmission line is dependent on the height of the transmission tower.
  • If tower height increases then the distance between the current carrying wire and ground increases, and line-to-ground capacitance decreases, as capacitance is inversely proportional to the distance between the line and earth.
  • While there is no effect on line to line capacitance.
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