For the four bus system as shown in Fig. Determine the fault current when the fault takes place at bus no.2 with fault impedance Zf =j0.42 p.u. The Subtransient reactance of the generators and positive sequence reactance of other elements are given. Assume pre fault Voltage Eth= 1Z0° p.u Generator X = jo.21p.u ; Transmission line X = jo.27p.u ; Transformer X = j0.3p.u Y글 스 Zth in p.u Fault current If in p.u Fault Current contribution by the Generator G1 (Ig1) 000 0000 0000 00000

For the four bus system as shown in Fig. Determine the fault current when the fault takes place at bus no.2 with fault impedance Zf =j0.42 p.u. The Subtransient reactance of the generators and positive sequence reactance of other elements are given. Assume pre fault Voltage Eth= 1Z0° p.u Generator X = jo.21p.u ; Transmission line X = jo.27p.u ; Transformer X = j0.3p.u Y글 스 Zth in p.u Fault current If in p.u Fault Current contribution by the Generator G1 (Ig1) 000 0000 0000 00000

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

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.19P

See similar textbooks

Similar questions

A generating plant containing three identical 40 MW generating units is connected to a constant 82 MW load. The unit failure and average repair times are 3 failures/year and 8 days respectively. Develop frequency, duration and probability risk indices for this system.
A 60 Hz, three-phase transmission line is 100 miles long. It has a total seriesimpedance of {35 + j120) n and a shunt admittance of j930 μsiemen. It delivers40 MW at 220 kV with 90% lagging power factor. Find the voltage at the sendingend by:(a) short line approximation(b) the nominal rr approximation(c) the nominal T approximationAlso determine the voltage regulation for the given line and the power loss.Assume the sending end voltage remains constant. Expected Answer: (a) 237.67 kV, 1.4284 MW, 8.03%; (b) 225.8 kV, 1.1642 MW, 8.67% (c) 225.10 kV, 1.5095 MW, 8.35% Pls. Provide Full Solution for thumbs up
A generator-transformer unit is connected to a line through a circuit breaker. The unit ratings are: Generator: 10 MVA, 6.6 kV; , and Transformer: 10MVA, 6.9133kV, reactance0.08pu The system is operating no load at a line voltage of 30 kV, when a three phase fault occurs on the line just beyond the circuit breaker' Find (a) the initial symmetrical rms current in the breaker’(b) The maximum possible DC off-set current in the breaker, (c) The momentary current rating of the breaker’ (d) The current to be interrupted by the breaker and the interrupting kVA and (e) The sustained short circuit current in the breaker
Assuming the voltage at the utility bus is 13.5 kV and the PV plant supplies 4.8 MW of power at 0.95 power factor lagging. Draw the diagram of the system and determine i) the per-phase voltage and current at the POI at the PV plant ii) the reactive power delivered and that which is lost in the line. Assume the line is modelled as a short line.
Question-2) The parameters of a three-phase transmission line are given as Z = (12.84 + j72, 76)Ω and y = j5, 83x10^-4 mho. At the end of the line, a power of 55 MVA with a power factor of 0.8 is drawn under 132 kV voltage. Accordingly, calculate the line head voltage, active and reactive power values per line, and voltage regulation of the line using the nominal π circuit.7-) Since 55 MVA power is drawn from the end of the line under the conditions mentioned above, calculate the line head voltage (phase-phase voltage) and enter it in the box below. (The value will be entered in kiloVolts. Only the amplitude value of the voltage will be entered. The phase value will NOT be entered!!! Two digits after the comma will be sufficient. )8-) Since 55 MVA power is drawn from the end of the line under the conditions mentioned above, calculate the active power value per line and enter it in the box below. (The value will be entered in MegaWatt. It will be sufficient to take two digits after…
470 kVA load at 12 kV. Its resistance is 7 Ω and inductive reactance is 7 Ω if the load power factor is 0.9 lagging. Determine the Current through the line , Sending end voltage , Sending end power factor , Regulation of transmission line , Efficiency of transmission line Note:please do not handwriting
Refer to Figure 1. Using its equivalent reactance diagram, what is the total impedance of the system up to the fault point at the end of the receiving line (in per unit)? Below are the parameters: G1 : 9 MVA, 13 kV, j0.11 p.u. G2 : 8 MVA, 13 kV, j0.06 p.u. T1 : 9 MVA, 13/69 kV, j0.042 p.u. TL : 262 km, 0.031 ohm per km, 0.3 ohm per km, operates at 69 Base values are that of G1. Round your answer to 2 decimal places. what is the fault MVA of the system when a three-phase fault occurs at the receiving end?
PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?
The motors M1andM2 of Problem 3.45 have inputs of 120 and 60 MW, respectively, at 13.2 kV, and both operate at unity power factor. Determine the generator terminal voltage and voltage regulation of the line. Neglect transformer phase shifts.
-) The active and reactive power drawn by the mixer fed from a 230 Vrms, 50 Hz single phase AC network was measured as 600 W and 100 VAR, respectively. According to this information: a) Calculate the apparent power drawn from the network? b) Calculate the current drawn from the network? c) Calculate the cos(a).
A balanced load of 30 MW is supplied at 132 kV, 50 Hz and 0•85 p.f. lagging by means of a transmission line. The series impedance of a single conductor is (20 + j52) ohms and the total phases-neutral admittance is 315 microsiemens. Shunt leakage may be neglected. Using the nominal T approximation, calculate the line voltage at the sending end of the line. If the load is removed and the sending end voltage remains constant, find the percentage rise in voltage at the receiving end.
A 50 MVA, 15 kV three phase generator has a subtransient reactance of 0.2 p.u. The generator supplies two motors over a transmission line having transformers at both ends as shown in Fig. The motors have rated inputs of 30 MVA and 20 MVA both 30 kV with 0.15 p.u. subtransient reactance. The rating of the sending end transformer, Tr1 is 50 MVA, 11 kV / 132 kV with leakage reactance of 0.1 p.u. Transformer Tr2 at the receiving end has three single phase transformers and the rating of each individual transformer is 20 MVA , 33 / 76 kV with leakage reactance of 0.12 p.u. Series reactance of the line is 25 ohms. Draw the reactance diagram with all reactance marked in p.u. Select the generator rating as the base in the generator circuit.