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In a dc transmision
  • a)
    it is necessary for the sending and receiving end to be operated in synchronism.
  • b)
    the effects of inductive and capacitive reactances are greater than in ac transmission line of the same rating.
  • c)
    there are no effects due to inductive and capacitive reactances.
  • d)
    power transfer capability is limited by stability considerations.
Correct answer is option 'C'. Can you explain this answer?
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In a dc transmisiona)it is necessary for the sending and receiving end...
As operating frequency, f = 0 therefore, there is no effect of XL and XC.
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In a dc transmisiona)it is necessary for the sending and receiving end...
DC Transmission: Effects and Limitations

Effects on DC Transmission Lines

- DC transmission lines do not have any effect due to inductive and capacitive reactances.
- This is because the voltage and current in a DC transmission line remain constant and do not change polarity, unlike in an AC transmission line where the voltage and current constantly change direction.
- As a result, there is no reactive power flow in a DC transmission line, which eliminates the need for reactive power compensation.

Limitations of DC Transmission Lines

- The power transfer capability of a DC transmission line is mainly limited by the stability considerations.
- The stability of a DC transmission line depends on the characteristics of the converter stations at both ends of the line.
- The maximum power transfer capability of a DC transmission line is limited by the stability margin, which is the difference between the actual operating point of the system and the point at which instability occurs.
- In order to maintain stability, the converter stations must be able to control the voltage and current on the DC transmission line.
- This requires sophisticated control systems that can respond quickly to changes in the system, such as changes in the load, fault conditions, or changes in the AC system to which the DC transmission line is connected.

Conclusion

In summary, DC transmission lines do not have any effect due to inductive and capacitive reactances. However, the power transfer capability of a DC transmission line is limited by stability considerations, which require sophisticated control systems at both ends of the line.
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it depends on the length of the conductor the capacitance of the line is proportional to the length of the transmission line their effect is negligible on the performance of short having a length less than 80 km and low voltage transmission accidents of the transmission line along with the conductances forms the shunted mittens the conductance and the transmission line is because of the leakage over the surface of the conductor considered a line consisting of two conductors and be each of radius are the distance between the conductors being Des shown in the diagram below minus the potential difference between the conductors and via's work QA charge on conductor QB charge on conductor vvab pencil difference between conductor and the Epsilon minus absolute primitivity QA plus QV = 0 so that QA equals QB - equals DBA equals data equals DB equals our substituting these values and voltage equation we get the capacitance between the conductors is cab is referred to as lying to line capacitance if the two conductors are in VR oppositely charge then the potential difference between them is zero then the potential of each conductor is given by one half bath the capacitance between each conductor and point of zero potential and is capacitive CN is called the capacitance to neut or capacitance to ground capacitance cab is the combination of two equal capacity and VN series thus capacitance to neutral is twice the capacitance between the conductors IE CN equals to Cave the absolute primitivity Epsilon is given by Epsilon equals epsilono Epsilon are where epsilano is the permittivity of the free space and Epsilon or is the relative primitivity of the medium prayer capacitance reactants between one conductor and neutral capacitance of the symmetrical three phase line let a balanced system of voltage be applied to a symmetrical three-phase line shown below the phasor diagram of the three phase line with equilateral spacing is shown below take the voltage of conductor to neutral as a reference phaser the potential difference between conductor and we can be written the similarly potential difference between conductors and sea is on adding equations one and two we get also combining equation three and four from equation 6 and 7 the line to neutral capacitance the capacitance of symmetrical three phase line is same as that of the two wire line Related: Capacitance of Transmission Lines?

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In a dc transmisiona)it is necessary for the sending and receiving end to be operated in synchronism.b)the effects of inductive and capacitive reactances are greater than in ac transmission line of the same rating.c)there are no effects due to inductive and capacitive reactances.d)power transfer capability is limited by stability considerations.Correct answer is option 'C'. Can you explain this answer?
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