3-A 400 kV, 50 Hz, 700 km long symmetrical line is operated at the rated voltage. a) Calculate the midpoint voltage under no load condition. b) What is the theoretical maximum power carried by the line? What is the midpoint voltage corresponding to this condition? c) A series capacitor is connected at the midpoint of the line to double the power transmitted. What is its reactance? d) A shunt capacitor of value 500 ohms is connected at the midpoint of the line. If the midpoint voltage is 0.98, compute the power flow in the line corresponding to this operating point. Data: 1=1 mH/km, c=11.1x10-9 F/km.

3-A 400 kV, 50 Hz, 700 km long symmetrical line is operated at the rated voltage. a) Calculate the midpoint voltage under no load condition. b) What is the theoretical maximum power carried by the line? What is the midpoint voltage corresponding to this condition? c) A series capacitor is connected at the midpoint of the line to double the power transmitted. What is its reactance? d) A shunt capacitor of value 500 ohms is connected at the midpoint of the line. If the midpoint voltage is 0.98, compute the power flow in the line corresponding to this operating point. Data: 1=1 mH/km, c=11.1x10-9 F/km.

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

Chapter5: Transmission Lines: Steady-state Operation

Section: Chapter Questions

Problem 5.18P

See similar textbooks

Similar questions

Transmission line conductance is usually neglected in power system studies. True False
The following parameters are based on a preliminary line design: per unitVS=1.0, VR=0.9 per unit, =5000km,Zc=320,=36.8. A three-phase power of 700 MW is to be transmitted to a substation located 315 km from the source of power. (a) Determine a nominal voltage level for the three-phase transmission line, based on the practical line-loadability equation. (b) For the voltage level obtained in part (a), determine the theoretical maximum power that can be transferred by the line.
A 350-km, 500-kV, 60-Hz, three-phase uncompensated line has a positive-sequence series reactance x=0.34/km and a positive-sequence shunt admittance y=j4.5106S/km. Neglecting losses, calculate: (a) Zc,. (b) l, (c) the ABCD parameters, (d) the wavelength of the line in kilometers, and (e) the surge impedance loading in MW.
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.
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.
A single circuit 60 Hz transmission line. the conductors are Linnet type with flat horizontal spacing of 17.46 feet between conductors. Determine: (a) Assume that the line is short with a length of 50 miles, calculate the parameters of the line and draw the equivalent circuit. (b) Assume that the line is average with length of 150 miles (Pi-nominal model). draw the pi-nominal circuit for the transmission line and calculate its parameters (Z and Y/2 values, where Z is the series impedance of the transmission line and Y is the shunt admittance).
Given a three-phase load of 125 MW at power factor of 0.8 lagging, operating at 69kV, with a transmission line efficiency of 97% and voltage regulation of 95%, and the line length of 50 km, design a transmission line system and determine the best conductor configuration, conductor resistance and inductance, and conductor radius values to achieve the efficiency and voltage regulation set. Assume a two-bundled conductor configuration with GMR of 0.0496 m and bundle spacing of 30 cm.
At no load condition, a 3- phase, 50 Hz, lossless power transmission line has sending end and receiving end voltages of 400 kV and 420 kV respectively. Assuming the velocity of light, the length of the line, in km, is _______.
Given a three-phase load of 125 MW at power factor of 0.8 lagging, operating at 69kV, with a transmission line efficiency of 97% and voltage regulation of 95%, and the line length of 50 km, design a transmission line system and determine the best conductor configuration,conductor resistance and inductance, and conductor radius values to achieve the efficiencyand voltage regulation set. Assume a two-bundled conductor configuration with GMR of 0.0496 m and bundle spacing of 30 cm.
explain the effect of sag verses tension in an overhead transmission line
What is the necessary condition for matching transmission lines? In addition, what is a micro strip line?
The total conductor cross section of a 537.40 kV (Peak value) three-phase overhead line with a length of 100 km is 517 mm2 and the conductor diameter is 29.6 mm. The roughness factor of the conductors is 0.8 and the distance between the conductors is 6 m. The ambient pressure along the line is 650 mmHg and the temperature is 15oC. Since there is corona discharge in only 5 km of this line, find the total Corona loss lost to the line using the Peek equation (Ed=30kVpeak/cm for Air). I would be very happy if you could be quick. :)