A single-phase line has two conductors of equal radii rand the separation between the conductors is D. The capacitance per unit length of the transmission line will be. (uF/km). for sigle phase ovehead line having solid condurtors of diameter 1 cm spaced 60 cm between centers the inductance in m kam is (a) 005 +02 og60 (b) 02 log60 o 005 + 02 logt6005) (d) 02 logt60/05) The inductance of power transmission line increases with (a) Decrease in line length (b) Increase in diameter of conductor (c) Increase in spacing between the conductors (d) Increase in load current carried by conductor Inductance of transmission line is minimumwhen (a) GMD is high (b) GMR is high (c) Both GMD and GMR are high (d) GMD is low and GMR is high When alternating current flows through a conductor (a) Entire current passes through the core ot conductor (b) Portion of conductor near the surface caries more current in comparison to the core (c) Current remains uniformly distributed over the whole cross section of conductor (d) Portion of conductor near the surface carres less current in comparison to the core

A single-phase line has two conductors of equal radii rand the separation between the conductors is D. The capacitance per unit length of the transmission line will be. (uF/km). for sigle phase ovehead line having solid condurtors of diameter 1 cm spaced 60 cm between centers the inductance in m kam is (a) 005 +02 og60 (b) 02 log60 o 005 + 02 logt6005) (d) 02 logt60/05) The inductance of power transmission line increases with (a) Decrease in line length (b) Increase in diameter of conductor (c) Increase in spacing between the conductors (d) Increase in load current carried by conductor Inductance of transmission line is minimumwhen (a) GMD is high (b) GMR is high (c) Both GMD and GMR are high (d) GMD is low and GMR is high When alternating current flows through a conductor (a) Entire current passes through the core ot conductor (b) Portion of conductor near the surface caries more current in comparison to the core (c) Current remains uniformly distributed over the whole cross section of conductor (d) Portion of conductor near the surface carres less current in comparison to the core

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 4.26P

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Similar questions

A single-phase overhead transmission line consists of two solid aluminum conductors having a radius of 3 cm with a spacing 3.5 m between centers. (a) Determine the total line inductance in mH/m. (b) Given the operating frequency to be 60 Hz, find the total inductive reactance of the line in /km and in/mi. (c) If the spacing is doubled to 7 m, how does the reactance change?
A 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.
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.
A three-phase overhead transmission line is designed to deliver 190.5 M VA at 220 kV over a distance of 63 km, such that the total transmission line loss is not to exceed 2.5 of the rated line MVA. Given the resistivity of the conductor material to be 2.84108-m, determine the required conductor diameter and the conductor size in circular mils. Neglect power losses due to insulator leakage currents and corona.
In terms of line-to-line capacitance, the line-to-neutral capacitance of a single-phase transmission line is Same Twice One-half
If the per-phase line loss in a 70-km-long transmission line is not to exceed 65 kW while it is delivering 100 A per phase, compute the required conductor diameter if the resistivity of the conductor material is 1.72108-m.
Calculate the capacitance-to-neutral in F/m and the admittance-to-neutral in S/km for the three-phase line in Problem 4.18. Also calculate the line-charging current in kA/phase if the line is 110 km in length and is operated at 230 kV. Neglect the effect of the earth plane.
A 40-km, 220-kV, 60-Hz, three-phase overhead transmission line has a per-phase resistance of 0.15/km, a per-phase inductance of 1.3263 mH/km, and negligible shunt capacitance. Using the short line model, find the sending-end voltage, voltage regulation, sending-end power, and transmission line efficiency when the line is supplying a three-phase load of (a) 381 MVA at 0.8 power factor lagging and at 220 kV and (b) 381 MVA at 0.8 power factor leading and at 220 kV.
For a single-phase, two-wire line consisting of two solid cylindrical conductors of same radius, r, the total circuit inductance, also called loop inductance, is given by (in H/m) 2107ln(Dr) 4107ln(Dr) where r=e14r=0.778r
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.
The capacitance of a single-circuit, three-phase transposed line with the configuration shown in Figure 4.38, including ground effect, and with conductors not equilaterally spaced is given by C20lnDeqrlnHmH8 F/mÂ line-to-neutral where Deq=D12D23D133=GMD r= conductors outside radiusHm=(H12H23H13)1/3HS=(H1H2H3)1/3 Now consider Figure 4.39 in which the configuration of a three-phase, single circuit, 345-kV line with conductors having an outside diameter of 1.065 in. is shown. Determine the capacitance to neutral in F/m, including the ground effect. Next, neglecting the effect of ground, see how the value changes.
Transmission line conductance is usually neglected in power system studies. True False