Q3/ For the system shown in figure. The generator is supplying 1.0 pu MW power t power under prefault condition. When three-phase fault occur at point F. What should the value of fault reactance must be to make the critical clearing angle equal to 58.9. Sc j0.1 1021 BE 38 j0.38 j0.1 उह j0.21 G m IEgl-1.2 pu BE 10.19 F 10.19 IVI=1.00 pu j0.1 j0.1 H

Q3/ For the system shown in figure. The generator is supplying 1.0 pu MW power t power under prefault condition. When three-phase fault occur at point F. What should the value of fault reactance must be to make the critical clearing angle equal to 58.9. Sc j0.1 1021 BE 38 j0.38 j0.1 उह j0.21 G m IEgl-1.2 pu BE 10.19 F 10.19 IVI=1.00 pu j0.1 j0.1 H

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 7.10P

See similar textbooks

Similar questions

500MVA, 21KV, star connected, 3ph 50Hz synchronous generator is operating at the rated voltage, a 3ph fault occurs at its terminal. Its reactance in p.u. are 1.5 of synchronous, 0.5 of transient, 0.2 of sub transient. The transient time is 500ms and the sub transient time is 35ms. 1. What will the AC component be after 1.5 cycles?
The reactance of the synchronous generator after sometime of the fault cleared is ............
The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.
A power station consists of two synchronous generators A & B of ratings 250 MVA and 500MVA with inertia 1.6 pu and 1.0 pu respectively on their own base MVA ratings. The equivalent pu inertia constant for the system on 100 MVA common base is:- (a) 2.6 (b) 0.615 (c) 1.625 (d) 9.0
In large transformers, the total copper losses may vary from the rated output. % of 0.8 to 1.5 0.2 to 0.6 0.5 to 1 0.4 to 1
A generating station is to supply four regions of load whose peak loads are10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Then the installed capacity is (25 to26)MW. O (24 to25)MW. O (23 to24)MW. O
Please solve the problem and show the circuit diagram. Thank you. 3. A 5 MVA, 13.2 kv, 3-phase wye-connected alternator has an effective resistance of 0.8 ohm and a reactance of 15 ohms per phase. It delivers full-load current at 0.707 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current, if the power factor is 0.6 leading?
two alternators A and B having 5% speed regulation are working in parallel at a station. Alternator A is rated at 15 MW while B is at 20 MW. When the total load to be shared is 12 MW, then how much of the load will be shared by the alternator B?
The p.u. impedance value of an alternator corresponding to base values of 13.2 kV and 30 MVA is 0.2 p.u. Then the p.u. impedance value of an alternator for the new base values of 13.8 kV and 50 MVA is......
Description In the particular case of figure below derive both the critical clearing angle and the critical clearing time. P, = Pmaz sin d Pm A1 do der Smar A generator having H = 6.R MJ/MVA is delivering power of 1.0 per unit to an infinite bus through a purely reactive network when the occurrence of a fault reduces the generator output power to zero. The maximum power that could be delivered is 2.5S per unit. When the fault is cleared, the original network conditions again exist. Determine the critical clearing angle and critical clearing time. (Roll=PQRS)
Try to solve this in 30 minutes. .( An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10. The relay is set to operate when there an out of balance current of 2 A. What percentage of the generator winding will be protected by the percentage differential scheme of protection?.. )
Q2\ Two generators G1 & G2 are rated 15 MVA, 11 kV and 10 MVA, 11 kV respectively. The generators are connected to a transformer as shown in the following figure. Find the sub- transient current in each generator when a three-phase fault occurs on the high voltage side of the transformer. A/Y 15 MVA, 11 kV, X"gl=j0.10 pu G2 15 MVA, 11/66 kV, Xr-j0.06 pu 10 MVA, 11 kV, X"g2-j0.10 pu