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Question:Conductor spacings, types, and sizes do have an impact on the series impedance and shunt admittance.

(a) True

(b) False

Short Answer

Expert verified

Answer

Therefore, the correct option is (a) True.

Step by step solution

01

Explain the conductor spacing 

Series impedance affects line-voltage drops I2 R losses, and stability limits, Shunt admittance, primarily capacitive, affects line charging currents, which inject reactive power into the power system.

Shunt reactors (inductors) are often installed on lightly loaded EHV lines to absorb part of this reactive power, thereby reducing over voltages.

02

Draw the conclusion

Conductor spacing, types, and sizes also determine the series impedance and shunt admittance. Series impedance affects line-voltage drops, I2 R losses, and stability limits.

Thus theconductor spacing, types, and sizes do have an impact on the series impedance and shunt admittance. So, the given statement is true.

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Most popular questions from this chapter

Calculate the inductive reactance in Ωkmof a bundled, three-phase completely transposed overhead line having three ACSRconductors per bundle, withbetween conductors in the bundle. The horizontal phase spacings between bundle centers areand.

Question:EHV lines often have more than one conductor per phase; these conductors are called a _______.

If the per-phase line loss in a 70km-long transmission line is not to exceed65kWwhile it is delivering 100Aper phase, compute the required conductor diameter if the resistivity of the conductor material is1.72×10-8Ωm.

The temperature dependence of resistance is also quantified by the relation R2=R1[1+α(T2-T1)] whereR1 andR2 are the resistances at Temperatures T1 andT2 , respectively, and αis known as the temperature coefficient of resistance. If a copper wire has a resistance of55Ω at role="math" localid="1655276953435" 20°C, find the maximum permissible operating temperature of the wire if its resistance is to increase by at most role="math" localid="1655277180970" 20°C. Take the temperature coefficient at data-custom-editor="chemistry" 20°C to be data-custom-editor="chemistry" α=0.00382.

(a) In practice, one deals with the capacitive reactance of the line in ohms-mi to neutral. Show that Eq. (4.9.15) of the text can be rewritten as

Xc=k'logDrohms-mi=x'd+x'a

Where x'd=k'logDis the capacitive reactance spacing factor

x'd=k'log1ris the capacitive reactance at 1-ft spacing

role="math" localid="1655202080897" k'=4.1×106/f=0.06833×106at f=60Hz

(b) Determine the capacitive reactance in Ωmifor a single-phase line of problem 4.14. if the spacing is doubled, how does the reactance change?

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