The one line diagram of a three phase power system is as shown in Figure 7 Impedances are marked in per unit on a 100 MVA, 400 kV base The load at bus 2 is S2 15.93 MW - j 33.4 MVar, and at bus 3 is S3 77 MW + j 14 MVar It is required to hold the voltage at bus 3 at 400 kV Working in per unit, determine the voltage at buses 2 and 1

The one line diagram of a three phase power system is as shown in Figure 7 Impedances are marked in per unit on a 100 MVA, 400 kV base The load at bus 2 is S2 15.93 MW - j 33.4 MVar, and at bus 3 is S3 77 MW + j 14 MVar It is required to hold the voltage at bus 3 at 400 kV Working in per unit, determine the voltage at buses 2 and 1

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

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.22P

See similar textbooks

Similar questions

For a balanced three-phase positive-sequence currents Ia,Ib,Ic, does the equation Ia+Ib+Ic=0 hold good?
Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: XY15MVA,13.8/138kV, leakage reactance 10 YZ15MVA,138/69kV, leakage reactance 8 With the base in circuit Y chosen as 15MVA,138kV determine the per-unit impedance of the 500 resistive load in circuit Z, referred to circuits Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
For large power transformers rated more than 500 kVA, the winding resistances, which are small compared with the leakage reactances, can often be neglected. (a) True (b) False
Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:Â Â Â Â 50Â MVA,Â 12kV,Â X=0.2 per unit Generator G2: 100Â MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the ThĂ©venin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.
A Y-connected load bank with a three-phase rating of 500 kVA and 2300 V consists of three identical resistors of 10.58. The load bank has the following applied voltages: Vab=184082.8,Vbc=276041.4, and Vca=2300180V. Determine the symmetrical components of (a) the line-to-line voltages Vab0,Vab1, and Vab2, (b) the line-to-neutral voltages and Van0,Van1, and Van2, (c) and the line currents Ia0,Ia1, and Ia2. (Note that the absence of a neutral connection means that zero-sequence currents are not present.)
A three phase symmetrical double circuit line is arranged in a horizontal plane as shown in figure below. Calculate and derive an expression for the transposed line for the inductance. Assume balanced equally distributed loads.
A three-phase symmetrical double circuit line is arranged in a horizontal plane as shown in figure below. Calculate and derive an expression for the transposed line for the inductance. Assume balanced equally distributed loads
Draw an impedance diagram for the electric power system shown in the figure attached, showing all impedances in per unit on a 100-MVA base. Choose 20kV as the voltage base for generator. The three-phase power and line-line ratings are given in the figure attached.
Calculate the initial symmetrical short circuit current that will occur when a 3 phase short circuit error occurs at the F point in the Figure below İ k3 phase-max ?
At the end of the 8 km overhead line given in the figure below, there are two distribution transformers, one of which is 800kVA and the other is 1200kVA, operated with power coefficients of 0.6 and 0.8, respectively. The end-of-line voltage is 6kV. Find the required rated cross section and line head voltage so that the power loss on the line is less than %pk = 10.
Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakagereactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances andexciting current are neglected. The high-voltage windings are connected in Y. A three-phase loadoperating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the lowvoltage windings are connecteda) in Y,b)
Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakage reactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances and exciting current are neglected. The high-voltage windings are connected in Y. A three-phase load operating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at 0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the low voltage windings are connecteda) in Y,b) in Delta