Concept explainers
Figure 4.34 shows double-circuit conductors' relative positions in segment I of transposition of a completely transposed three-phase overhead transmission line. The inductance is given by
Where
With mean distances defined by equivalent spacings
And
Now consider a 345-kV, three-phase, double-circuit line with phase-conductor’s GMR of 0.0588 ft and the horizontal conductor configuration shown in Figure 4.35.
- Determine the inductance per meter per phase in Henries (H).
- Calculate the inductance of just one circuit and then divide by 2 to obtain the inductance of the double circuit.
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Power System Analysis and Design (MindTap Course List)
- Shield wires located above the phase conductors protect the phase conductors against lightning. True Falsearrow_forwardA 60-Hz, single-phase two-wire overhead line has solid cylindrical copper conductors with a 1.5 cm diameter. The conductors are arranged in a horizontal configuration with 0.5 m spacing. Calculate in mH/km (a) the inductance of each conductor due to internal flux linkages only, (b) the inductance of each conductor due to both internal and external flux linkages, and (c) the total inductance of the line.arrow_forwardFor the overhead line of configuration shown in Figure 4.33 operating at 60 Hz and a conductor temperature of 700C, determine the resistance per phase, inductive reactance in ohms/mile/phase, and the current-carrying capacity of the overhead line. Each conductor is ACSR Cardinal of Table A.4.arrow_forward
- The affect of the earth plane is to slightly increase the capacitance, and as the line height increases, the effect of earth becomes negligible. True Falsearrow_forwardFor the case of double-circuit, bundle-conductor lines, the same method indicated in Problem 4.27 applies with r' replaced by the bundles GMR in the calculation of the overall GMR. Now consider a double-circuit configuration shown in Figure 4.36 that belongs to a 500-kV, three-phase line with bundle conductors of three subconductors at 21 in. spacing. The GMR of each subconductor is given to be 0.0485 ft. Determine the inductive reactance of the line in ohms per mile per phase. You may use XL=0.2794logGMDGMR/mi/phasearrow_forwardFigure 4.37 shows the conductor configuration of a three-phase transmission line and a telephone line supported on the same towers. The power line carries a balanced current of 250 A/phase at 60 Hz, while the telephone line is directly located below phase b Assume balanced three-phase currents in the power line. Calculate the voltage per kilometer induced in the telephone line.arrow_forward
- A single-phase transmission line consisting of two conductors, the radius of each conductor is 0.4 cm, the distance between the conductors is three and half meters and the height above ground is eight meter. Determine 1)The capacitance in uF/km without effect of ground 2)The capacitance in uF/km with effect of groundarrow_forwardA 10 km long three phase line having a diameter of 2.5 mm conductors is arranged symmetrically with a spacing of 2 m. So find the inductance per phase and capacitance per phase.arrow_forwardNote that the given 25 kV L-L voltage appears across the loads (right side of ZL) as denoted by Vab, Vbc, and Vca. Since there is no given voltage angle, you may assign angle zero to one of the line-to-neutral voltages. 1. Without the capacitors, what is the magnitude of the current passing through the line impedance ZL?arrow_forward
- A 3-phase 80 km long single circuit 66 kV transposed overhead line has horizontal spacing with 5 m between adjacent conductors and 6 m between outer conductors. The conductor diameter is 2.5 cm. Find the Inductance per phasearrow_forwardUsing Maxwell’s Mesh (Loop) Methodarrow_forwardA 230 kV, 60 Hz, three-phase completely transposed overhead line has one ACSR 874.5-kcmil conductor per phase and flat horizontal phase spacing, with 8 m between adjacent conductors (refer Table A.4). Determine the inductance in H/m and the inductive reactance in Ω/km.arrow_forward
- Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning