Q the following Sequence curent were recorded under an un balanced fault condition La =-J1.653 p.u Ia,= Jo-5 p.u Iooil153120o pu A: Identify the type of fault B Asume that prefault voltoge is 1.0 pu and Va, = o.175 p.u. Find the Sequence impedonces of the System under the above Condition

Q: The faults which give rise to unsymmetrical currents (unequal line currents with unequal…

A: Faults may occur in the power system due to Number of reasons. Faults that occurs in transmission…

Q: The transient stability analysis should be performed based on which fault?

A: Transient stability analysis is used in the transfer function under various disturbances.

Q: The shunt branches of are neglected to draw the reactance diagram. Static Loads Transformer O…

A: The explanation is as follows.

Q: と。 O/ A balance 2-phose Y-Comecled \aad has z to 4-usa on Find phose Curents and live cnnnts.

A: Given data, Phase impedance is given, Zph=10∠-450 VCA is the voltage between line C and A therefore…

Q: The zero sequence current of a generator for line to ground faults is į 3.0 p.u. Then the current…

A: Given, For the line to ground fault, the zero-sequence current, I0=j3.0 pu

Q: The sequence components have same voltage magnitude.

A: This problem is based on the sequence components

Q: Which of the following is not a boundary condition for an SLG fault on phase 'a' of a power system?…

A: Since the single line to ground fault occurs on the phase a of the system the fault current of phase…

Q: The negative sequence current of a solidly grounded generator for single line to ground fault is j…

A:

Q: For the circuit shown, the normal operating values shown are known. If a symmetrical three-phase…

A: We can redraw the per-phase equivalent circuit as

Q: A short circuit occurs in the series R-L circuit with V = 20 kV, X = 8 ohm, and R = 0.8 ohm. The…

A: Given V- 20 kV R= 0.8 ohm X= 8 ohm

Q: If the core loss of single phase transformer at full load is 294 W, then the core loss at 50% of…

A: In this question we need to find a core loss of a transformer  at 50% load

Q: a generator has a capacity of 2000KVA and 10% of internal percentage reactance, for symmetric fault…

A: (MVA)old = 2000 MVA (MVA)new = 5000 MVA %Xold = 10 %

Q: 7. Determine the phasor secondary current in the transformer circuit below. 1:25 1020° V ž, 900-…

A:

Q: positive, negative, and zero sequence reactances of 0.25 pu, 0.15 pu, and 0.05 pu, respectively. The…

A: The expression for single line to ground fault current is given as:

Q: are used across an inductive and capacitive loads so as to supply part of the reactive VARS required…

A:

Q: What is the phase displacement between any three currents of LLL fault of a three phase system.

A: LLL fault is called as the triple line fault.

Q: 8 - What is the time it takes to complete a cycle in AA? A) Positive alternans B) Period C)…

A: What is the time it takes to complete a cycle in AA?

Q: ort-circuit occurs at its terminals. The fault MVA and fault

A: In this question, alternator ratings are given..3 phase short circuit occurs at terminals..We have…

Q: A 400 V, 3-phase alternator is subjected to an unsymmetrical fault. The

A: Ia=Ia0+Ia1+Ia2Ia=-j10+j6+j4=0Therefore , it is Double line to ground fault Fault current is -…

Q: 3-phase fault is the severe fault among all other faults True False

A: Choose the correct option Is it true or false The given Statment "3 phase fault is severe fault…

Q: The sequence components of the fault Izero = -j1pu. The type of fault in the system is current are…

A: The sequence components of the fault current are, Ia1=j2 puIa2=-j0.5 puIa0=-j1.5 pu

Q: £2 tribution feeder has 600/5 C100 CT. A three phase fault of 1=10200A occurs at F as shown in…

A: Given Fault current =If =10200 A CT burden resistance ZR=0.1 ohm Lead resistance =RL=0.5 ohm CT…

Q: A 3 phase fault occurs at bus 1. Fault impedance Z, =j0.2 p.u. Z,, = 0.07286 p.u. Then the fault…

A: In this answer we will try to find out the fault current at bus-1 as shown below. Fault current is…

Q: Which is easier to smooth the wave a three-phase unifying circuit or a single-phase circuit using a…

A: Three phase unifying circuit: A three-phase unifying circuit, also known as a three-phase bridge…

Q: ence components of the fault current are as Ipositive 12 p.u., Inegative and Izero The type of fault…

A: SOLVE ABOVE QUES

Q: A LLL fault occurs at terminals of a 33 kV, 3 phase 50 Hz circuit breaker. The maximum value of…

A: Given- A LLL fault- 33 kV, 3 phase-50 Hz circuit breaker, To Find- The maximum value of the…

Q: For the circuit shown, if a symmetrical three-phase fault occurs in node 2, determine a. The…

A:

Q: If the core loss of single phase transformer at full load is 284 W, then the core loss at 25% of…

A: Core losses at full load = 284W. Find the core losses at 25% load?

Q: In short circuit of single phase transformer input power is equal to

A: Short circuit test usually conducted on H.V side and L.V side is short circuited.

Q: Question 4 A star connected neutral grounded 3-phase synchronous generator consists of 0.1 p.u of…

A: In this question we need to find a zero sequence reactance of genrator

Q: The sequence components of the fault current are as follows: Ipositive = j 2 p.u., Inegative = -j0.5…

A: Given, The sequence components of the fault current are, Ia1=j2 puIa2=-j0.5 puIa0=-j1.5 pu

Q: A 13.2 kV, 60 Hz, 3-phase synchronous generator is connected in star and its neutral point is…

A: Given, The supply voltage (E)= 13.2 kV(rms)  Frequency (f)= 50 Hz  Per phase inductance (L)= 0.02 H…

Q: A star connected Alternator excitation voltage and terminal voltages per phase respectively are 180V…

A: Alternator: It is used to convert the mechanical energy to electrical power in the form of…

Q: In a distribution system, the transient faults occurs in Both OH distribution system…

A: Choose the correct option   In a distribution system, the transient faults occurs in?

Q: the core loss of single phase transformer at full O 52W O 105W O 13W O 210W

A: In transformer, mainly two losses present namely core and copper losses.

Q: Delta to Wye Conversion with figure

A:

Q: The sequence components of the fault Izero -j1pu. The type of fault in the system is current are as…

A: In this question we need to identify the type of fault

Q: capacitors will supply reactive VAR during peak load condition and consumes reactive VARs during…

A: 1.Booster Transformer:-It is used at the end of a power line or at the intermediate position to…

Q: True or False Instrument transformers are used for extending the ranges of instruments in…

A: - There are two types of instrument transformers namely; current transformer and potential…