2. In a 30-km span, 3-phase line, calculate the per-phase resistance at 50°C, inductive reactance and capacitive reactance of the transmission line that uses triangular bundled conductors. The conductors in the bundle are 397.5 MCM ACSR, 26/7 and are spaced 10 inches per conductor and 10 meters per line. 76 88 288 288

2. In a 30-km span, 3-phase line, calculate the per-phase resistance at 50°C, inductive reactance and capacitive reactance of the transmission line that uses triangular bundled conductors. The conductors in the bundle are 397.5 MCM ACSR, 26/7 and are spaced 10 inches per conductor and 10 meters per line. 76 88 288 288

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.18P: A 230-kV, 60-Hz, three-phase completely transposed overhead line has one ACSR 954 kcmil conductor...

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A 60-Hz, three-phase three-wire overhead line has solid cylindrical conductors arranged in the form of an equilateral triangle with 4-ft conductor spacing. The conductor diameter is 0.5 in. Calculate the positive-sequence inductance in Wm and the positive-sequence inductive reactance in /km.
Three ACSR Drake conductors are used for a three-phase overhead transmission line operating at 60 Hz. The conductor configuration is in the form of an isosceles triangle with sides of 20, 20, and 38 ft. (a) Find the capacitance-to-neutral and capacitive reactance-to-neutral for each 1-mile length of line. (b) For a line length of 175 mi and a normal operating voltage of 220 kV, determine the capacitive reactance-to-neutral for the entire line length as well as the charging current per mile and total three-phase reactive power supplied by the line capacitance.
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 L=2107lnGMDGMRH/m/phase Where GMD=(DABeqDBCeqDACeq)1/3 With mean distances defined by equivalent spacings DABeq=(D12D12D12D12)1/4DBCeq=(D23D23D23D13)1/4DACeq=(D13D13D13)1/4 And GMR=[ (GMR)A(GMR)B(GMR)C ]1/3 with phase GMRs defined by (GMR)A=[ rD11 ]1/2;(GMR)B=[ rD22 ]1/2;(GMR)C=[ rD33 ]1/2 and r is the GMR of phase conductors. Now consider a 345-kV, three-phase, double-circuit line with phase-conductors 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.
For a single-phase two-conductor line with composite conductors x and y, express the inductance of conductor x in terms of GMD and its GMR.
3-phase single circuit bundled conductor line with two sub-conductors per phase has horizontalspacing with 6.1 m between the centre lines of adjacent phases. The distance between the subconductorsof each phase is 30.5 cm and each sub-conductor has a diameter of 2.54 cm. Find theinductance per phase per km. [0.988 mh]
A 60 Hz, three-phase, transposed transmission line, is designed with three bobolink conductors per phase, in horizontal arrangement as shown in the figure below. Distance between consecutive phases is D = 6.2 m and distance among bundle conductors is h =0.5m. Each conductor has a radius of 18 mm and a GMR of 14.39mm. The per phase resistance is 1.677x10-5 2/m. r= 18 mm GMR= 14.39 mm a b h D D The per phase shunt admittance assuming zero conductance in µO/km is: О a., 5.4347 O b. j5.3316 О с /4.2266 O d. j4.0973 O e. 59630.2922 + j10.9770
A three-phase transposed line is composed of one ACSR 159,000 cmil, 54/19 Lapwing conductor per phase with flat horizontal spacing of 8 meters as shown in Figure FE-1. The GMR of each conductor is 1.515 cm. a. Determine the inductance per phase per kilometer of the line. b. This line is to be replaced by a two-conductor bundle with 8-m spacing mea- sured from the center of the bundles as shown in Figure FE-2. The spacing between the conductors in the bundle is 40 cm. If the line inductance per phase is to be 77 percent of the inductance in part (a), what would be the GMR of each new conductor in the bundle? a b 0,0 D12 = 8 m D23 = 8 m - 40 -D12 = 8 m- -D23 = 8 m- - D13 = 16 m- D13 = 16 m- %3D Figure FE-1 Figure FE-2
Q: 5 Figure below shows a 345 kV double-circuit three-phase transposed line composed of one ACSR, 556, 500-cmil, 26/7 Dove conductor per phase with horizontal conductor arrangement. The conductor has a diameter of 0.927 in and a GMR of 0.3768 in. Find the inductance per phase per km of the line. a b' -8 m 8 m 9 m 8 m 8 m
A single phase 2 conductor operates at 50Hz, the diameter of each condcutor is 60mm and spacing between condcutor is 5m, find the loop inductance of the line.
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Find the inductive reactance per mile of a single-phase line operating at 50 Hz. The conductor has a GMR of D, 0.0217 ft, and spacing GMD is 15 ft between centers. O 0.41 O 0.66 O 0.79 O 0.49
4.18 A 230-kV, 60-Hz, three-phase completely transposed overhead line has one ACSR 954 kcmil conductor per phase and flat horizontal phase spac- ing, with 7 m between adjacent conductors. Determine the inductance in H/m and the inductive reactance in Q/km.