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Doctors Medicines MCQs Q&A

  1. Bundled conductor are not necessary for reducing corona effect
  2. Current density decreases as voltage increases with charging current
  3. Control of power flow in the lines is simple and natural
  4. Insulation coordination based upon switching impulse level
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1 Answers

Option 3 : Control of power flow in the lines is simple and natural

Advantages of EHV Lines: 

  • In a transmission line, the amount of power, distance, conducting material, and power factor are constant. Hence, if the voltage is increased, the line losses are decreased because losses are inversely proportional to the voltage.
  • If the losses are reduced because of higher voltage, naturally the efficiency of the line is increased. Voltage regulation is improved due to a reduction in line loss.
  • Generating stations are located in remote areas from the point of view of economy, feasibility and safety purposes. Hence, EHV transmission is unavoidable for the transmission of large amounts of power from these stations to the load centers and Control of power flow is natural and simple.
  • Overall there is a reduction in cost with an increase in transmission voltage. 
  • The load-carrying capability of the line is given as surge impedance loading (SIL) which is directly proportional to the square of the voltage. Hence, the increase in voltage results in more SIL and more power transfer capacity.
  • With the increase in the voltage, the number of circuits and land requirements is reduced greatly.
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