LU 3) A three-phase line delivers-3 MW at 11 Ky for a distance of 15 Km. Line loss 10% of power delivered, load power factor is 0.8 lagging, frequency is 50 Hz, 1.7 m equilateral spacing of conductors. Calculate the sending-end voltage and regulation. For skin effect Rac is greater than Rdc by 20%, conductor material has a resistivity p equal to 1.126x10-8 Ω.m. أكبر منها

LU 3) A three-phase line delivers-3 MW at 11 Ky for a distance of 15 Km. Line loss 10% of power delivered, load power factor is 0.8 lagging, frequency is 50 Hz, 1.7 m equilateral spacing of conductors. Calculate the sending-end voltage and regulation. For skin effect Rac is greater than Rdc by 20%, conductor material has a resistivity p equal to 1.126x10-8 Ω.m. أكبر منها

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 4.28P: For the case of double-circuit, bundle-conductor lines, the same method indicated in Problem 4.27...

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Conductor spacings, types, and sizes do have an impact on the series impedance and shunt admittance. True False
Transmission line conductance is usually neglected in power system studies. True False
For 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/phase
(a) A three phase transposed transmission tower comprises of three-bundled conductor and double-circuit configured in vertical position as shown in Figure 2. Each sub-conductor in each circuit and each phase is an ACSR type, size 477,000 cmil and stranding 26/7. Given the GMR of each sub-conductor is 0.8809 cm and diameter is 2.1793 cm, analyze: i. Inductance in mH/km ii. Capacitance in µF/km 0.75m 7.5m b' 4m 4m 45cm Figure 2
QUESTION 2.3 Find the capacitance to neutral for the signal-circuit, three-phase, 345-kV line with conductors having an outside diameter of 1.075 in. with phase configuration forming an "H” system (i.e., a horizontal phase configuration). The adjacent phase separation of the conductors is 20.0 ft. A 20.0 ft B Figure 2. 20.0 ft C
A three-phase transposed line is composed of one ACSR Bobolink conductor per phase with a horizontal spacing of 11 meters as shown in the figure. phase with a horizontal spacing of 11 meters as shown in the figure. The conductors have a diameter of 3.625 cm and a RMG of 1.439 cm. Calculate the inductance and capacitance to the neutral of the line.
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
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]
Discuss the desirable properties of insulators. Explain the causes of insulator failure due to electrical breakdown. Each line of a three-phase system is suspended by a string of three identical insulators of self-capacitance C farad. The shunt capacitance of connecting metal work of each insulator to earth is 20.7 % of C while for line it is 13.8 % of C. Calculate the string efficiency of the system if a guard ring increases the capacitance to the line of metal work of the lowest insulator to 0.25 C.
Q2) A 3-phase load of 5 MW at a power factor of 0.9 lagging is to be transmitted over a distance of 100 km with a receiving end voltage of 66 kV, 50 Hz. Each conductor has a resistance Of 0.8 2 /km and radius of 26.1 mm, the conductors have an equilateral spacing of 2 m. Find the sending end voltage, current and power factor, by using: 1) Nominal a circuit method. 2) Nominal T circuit method.
2.5 A 3-phase single circuit bundled conductor line with two sub-conductors per phase has horizontal spacing with 6.1 m between the centre lines of adjacent phases. The distance between the sub- conductors of each phase is 30.5 cm and each sub-conductor has a diameter of 2.54 cm. Find the inductance per phase per km. [0.988 mH]
moodle.nct.edu.om/mod rning Portal Courses - Reports - e-Services - Academic Departments ETC - CIMS - Three conductors of a 3-phase overhead line are arranged in a horizontal plane in the order a-b-c, distance between a and b is 6 m, b and c is spaced 6 m apart. The diameter of each line conductor is 2.5 cm. Calculate the Capacitance per phase per km (L1) for this arrangement. Calculate Capacitance per phase per km(L2) if the spacing between the conductors are reduced by half. Calculate the Ratio of C2 with respect to C1. Capacitance in nF per Phase per Km for Arrangement 1 (C1) Capacitance in nF per phase per km for Arrangement 2 (C2) Ratio of C2 to C1 A 3-phase, 50 Hz, 60 km long overhead line supplies 1400 kW at 11 kV, 0.7 p.f. lagging. The line resistance is 0.025 Q per phase per km and line inductance is 0.8 mH per phase per km. Calculate the sending end voltage voltage regulation and efficiency of transmission. Sending End Voltage