A 100-km long, 3-phase, 50-Hz transmission line has following line constants: Resistance/phase/km = 0-1 2 %3D Reactance/phase/km = 0-5 2 Susceptance/phase/km = 10 x 106 s If the line supplies load of 20 MW at 0-9 pf. lagging at 66 kV at the receiving end, calculate by nominal n method: (i) sending end power factor (ii) regulation (ii) transmission efficiency

A 100-km long, 3-phase, 50-Hz transmission line has following line constants: Resistance/phase/km = 0-1 2 %3D Reactance/phase/km = 0-5 2 Susceptance/phase/km = 10 x 106 s If the line supplies load of 20 MW at 0-9 pf. lagging at 66 kV at the receiving end, calculate by nominal n method: (i) sending end power factor (ii) regulation (ii) transmission efficiency

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 5.25P

See similar textbooks

Similar questions

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.
Consider a long radial line terminated in its characteristic impedance Zc. Determine the following: (a) V1/I1, known as the driving point impedance. (b) | V2 |/V1|, known as the voltage gain, in terms of al. (c) | I2 |/| I1 |, known as the current gain, in terms of al. (d) The complex power gain, S21/S12, in terms of al. (e) The real power efficiency, (P21/P12)=, terms of al. Note: 1 refers to sending end and 2 refers to receiving end. (S21) is the complex power received at 2; S12 is sent from 1.
A 3-phase transmission line, 160 km long, has the following constants: Resistance/phase/km= 0.2 ohm Resistance/phase/km= 0.3127 ohm Shunt admittance/phase/km= 1.875 x 10^-6 S Determine the sending end voltage and current by rigorous method when the line is delivering a load of 25 MVA at 0.8 p.f. lagging. The receiving end voltage is kept constant at 110 kV.
A 3 phase, 50 Hz, 150 km line has a resistance, inductive reactance and capacitive shunt admittance of 0.1Ω, 0.5Ω, and 3 x 106 S per km per phase. If the line delivers 50MW at 110kV and 0.8 pf lagging, Assume a nominal phi circuit for the line determine: a. Sending end current b. Line value of the sending end voltage c. Transmission efficiency d. Voltage regulation e. Sending end power factor
A 500 kV, 60 Hz uncompensated three-phase transmission line is 500 km long. The line has three ACSR 1113-kcmil (Finch) conductors per phase with parameters Current carrying capability of single ACSR 1113-kcmil (Finch) conductor is 1,110 A. Calculate the theoretical maximum (steady state stability limit) real power that this line can deliver and compare with the thermal limit of the line. Assume VS = VR = 1.0 per unit and unity power factor at the receiving end.
The length of a transmission line is (1000/3) kilometers. For this transmission line r=0.15 ohm/km x=0.8 Ohm/km y=5 * 10^-6 S/km given in the form. At the end of the line (36) MW is drawn and the end-of-line voltage is (220) kV. power factor: 0.95 (back) a. Assuming the line as a short line, calculate the VS and IS values with their angles. b. A, B, C, D by accepting the line as a mid-length line and using the "T" model approach. Calculate the parameters (Vs Is calculation is not needed) C. Calculate only parameter A, assuming the line as a long line.
A 3 phase, 50 Hz, 150 km line has a resistance, inductive reactance and capacitive shunt admittance of 0.1Ω, 0.5Ω, and 3 x 10-6 S per km per phase. If the line delivers 50 MW at 110 kV and 0.8 pf lagging, Using nominal "T" method, determine: a. Sending end current b. Line value of the sending end voltage c. Transmission efficiency d. Voltage regulation e. Sending end power factor
In three-phase short transmission line with end-of-line interphase voltage UR = 31,5kV , from the end of the line active power absorbed PR = 9000 kW, end of line power factor is cosφ = 0,70 (end) and the length of the line is l = 20km, The resistance of the line per km is R'= 0,125 Ohm/km, the reactance per km is X'= 0,375 Ohm/km.With the help of given information; a) Calculate the current drawn from the line (IR) as a phasor. b) Calculate the line-to-line-neutral voltage (VS) as a phasor, determine the effective line-to-line voltage (US) Calculate its value. c) Calculate the line head power factor, active and reactive power drawn from the line head, d) Draw the phasor diagram of the system. ..
b) Ghana Grid Company (GRIDCo) designed a short transmission line using the A, B, C, D line constant of a transmission line parameters in its analysis. The engineering planning department came up with the design and said that when they computed the line performance using the equation AD – BC the answer was equal to 1.As an employee at the Ministry of Energy (MoEn) having oversight responsibility over GRIDCo, how would you accept the answer and recommend the Government of Ghana (GoG) to go ahead to implement the short transmission line?
A 3-phase transmission line, 160 km long, has the following constants : Resistance/phase/km = 0·2 Ω[263·574 kV ; 187·5 A]Reactance/phase/km = 0·3127 Ω Shunt admittance/phase/km = 1·875 × 10−6 SDetermine the sending end voltage and current by rigorous method when the line is delivering a load of 25 MVA at 0·8 p.f. lagging. The receiving end voltage is kept constant at 110 kV
Give the physical significance of the generalized circuit constant A,B,C and D of a transmission line. Find the values of A, B, C, D in the following approximate methods in terms of Z and Y (i)simple series impedance method (ii) nominal π method (iii) nominal T method
Example: A 3-@ transmission line 250 km long has the following constants: Resistance/phase/km = 0-16 Q Reactance/phase/km = 0-25 Q Shunt admittance/phase/km = 1-5 x 10° S Calculate by Rigorous method the sending end voltage and current when the line is delivering a load of 20 MW at 0-8 p.f. lagging. The receiving end voltage is kept constant at 110 kV.