A $60-\mathrm{Hz}, 765-\mathrm{kV}$ three-phase overhead transmission line has four ACSR $1113 \mathrm{kcmil}$ $54 / 3$ conductors per phase. Determine the $60-\mathrm{Hz}$ resistance of this line in ohms per kilometer per phase at $50^{\circ} \mathrm{C}$.

Question

Quizplus · Accepted Answer

The Answer is From Table A. 4

R_{60 \mathrm{~HƵ}, 50^{\circ} \mathrm{C}}=\left(0.0969 \frac{\Omega}{\mathrm{mi}} ight)\left(\frac{1 \mathrm{mi}}{1.609 \mathrm{~km}} ight)=0.0602 \frac{\Omega}{\mathrm{km}} ext { per conductor (at } 75 \% ext { current capacity) }

For 4 conductors per phase:

R_{60 \mathrm{~HƵ}, 50^{\circ} \mathrm{C}}=\frac{0.0602}{4}=\underline{\underline{0.0151}} \frac{\Omega}{\mathrm{km}} ext { per phase }

A 60−Hz,765−kV60-\mathrm{Hz}, 765-\mathrm{kV}60−Hz,765−kV Three-Phase Overhead Transmission Line Has Four ACSR 1113kcmil1113 \mathrm{kcmil}1113kcmil

A $60-\mathrm{Hz}, 765-\mathrm{kV}$ Three-Phase Overhead Transmission Line Has Four ACSR $1113 \mathrm{kcmil}$