1) A 220 kV long transmission line has an impedance of 2 + j8Q. This line is protected by MHO type distance relay with characteristics angle of 70° and its first zone covers 80% of the line length. The CT ratio and PT ratio are 1000/1 A and 220 kV/110 V, respectively. Considering a fault resistance of 22, the first zone setting of the distance relay is

1) A 220 kV long transmission line has an impedance of 2 + j8Q. This line is protected by MHO type distance relay with characteristics angle of 70° and its first zone covers 80% of the line length. The CT ratio and PT ratio are 1000/1 A and 220 kV/110 V, respectively. Considering a fault resistance of 22, the first zone setting of the distance relay is

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 5.11P: A 40-km, 220-kV, 60-Hz, three-phase overhead transmission line has a per-phase resistance of...

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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.
Transmission line conductance is usually neglected in power system studies. True False
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A 60-Hz, 765-kV, three-phase overhead transmission line has four ACSR 900 kcmil 54/3 conductors per phase. Determine the 60 Hz resistance of this line in ohms per kilometer per phase at 50C.
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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 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.
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The 500-kV, 60-Hz, three-phase line in Problems 4.20 and 4.41 has a 180-km length and delivers 1600 M W at 475 kv and at 0.95 power factor leading to the receiving end at full load. Using the nominal circuit, calculate the (a) ABCD parameters, (b) sending-end voltage and current, (c) sending-end power and power factor, (d) full-load line losses and efficiency, and (e) percent voltage regulation. Assume a 50C. conductor temperature to determine the resistance of this line.
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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).
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