For the system shown in figure below, the per unit values of different quantities areE-1.2, V 1, X X2-0.4. Xa-0.2Determine whether the system is stable for a sustained fault.The fault is cleared at 8-60°. Is the system stable? If so find the maximumrotor swing.Find the critical clearing angle.E25GX'd08CBX2FCBV28Infinitebus

Answered: Image /qna-images/answer/ea1507bb-5047-4ed2-b3b2-4f7116cdf463.jpg

Answered: For the system shown in figure below,…

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 7.21MCQ

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22. The voltage applied to the h.v. side of a trans- former during short-circuit test is 2% of its rated of voltage. The core loss will be........percent the rated core loss. (a) 4 (b) 0.4 (c) 0.25 (d) 0.04
A 12 MVA, 132/6.6 kV, transformer having a reactance of 0.15 pu is fed from an infinite bus. The transformer feeds two motor each 6 MVA, 6.6 kV. Each motors has a transient reactance of 0.14 pu and a subtransient reactance of 0.30 pu based on its own rating. A three phase balanced fault occurs at the terminals of one motor as shown in the figure below. Find the subtransient fault current and subtransient current in breaker. M1) 132/6.6 KV СВ 38 CB Infinite Bus M2 Fault
solve with explanation.
A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?
Q2. The single-line diagram of a simple three-bus power system is shown in Figure-2. Each generator is represented by an emf behind the sub-transient reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 3 through a fault impedance of Zf = j0.19 per unit. (i) Using Th'evenin's theorem, obtain the impedance to the point of fault and the fault current in (ii) Determine the bus voltages per unit. ) j0.05 j0.075 j0.75 2 j0.30 j0.45 Figure-2: Single line diagram of the power system network for Q2 3
stribution feeder has 600/5 C100 CT. A three phase fault of l=10200A occurs at F as shown in Calculate the voltage drop developed across CT if the phase relay burden resistance Z₁ = 0.1 , the lead resistance R₁ = 0.5f, and the CT resistance Rg=0.40 Will this fault current lead to CT saturation? If not at what fault level, the CT will saturate? GOM 600:5 O/C R Fig. 2 10200A
What are electrical techniques used for failure analysis
For 4 pole d.c machine armature winding with a double layer progressive simplex wave winding with 23 number of slots answer the following: a How many coils are present? b What is the coil span in terms of number of slots? c What is commutator pitch in terms of commutator segments? d How many coils are there between two consecutive commutator segments? e How many parallel paths are present?
What are the hazards of phase failure and phase reversal?
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
A generator supplies a motor through a Y-A transformer. The generator is connected to Y side of the transformer. A fault occurs between the motor terminals and the transformer. The symmetrical components of the subtransient current in the motor flowing toward the fault are: I =-0.8- j2.6pu I =-j2.0pu I =-j3pu From the transformer toward the Fault: I = 0.8– j0.4pu I? =-j1.0pu 1 = Opu Assume X =X,=X, for both the motor and the generator. (a) Describe the fault type and find the prefault current, if any, in line a. (b) Determine the subtransient fault current in per unit. (c) Calculate the subtransient current in each phase of the generator in per unit taking into consideration the phase shift of the Y-A transformer.
examples of application of transformers in power supply circuits

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