ith a subtransient reactance of 0.1 pu, are connected through a line of reactance 0.1 py on the base of the achines rating. One machine is acting as a synchronous generator, while the other is working as a motor rawing 45-MW at 0.80 PF leading with a terminal voltage 14.5-kV. A symmetrical three-phase fault occurs at e motor bus. Calculate the following: 21. The generator fault current contribution (p,y.) is 22. The motor fault current contribution (p.µ.) is 23. The total fault current is

Q: The symmetrical fault occurs in the terminals of the synchronous generator. Find the direct axis…

A: Find the direct axis transient Reactance of the symmetrical generator?  If the leakage Reactance Xl=…

Q: Question: Find out the appropriate protection schemes for stator winding protection of alternator.…

A: The most common system used of the protection of stator winding foults in the differential…

Q: A synchronous generator, with synchronous reactance of 6 ohm, is connected directly to an infinite…

A: Given synchronous generator

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

A: Given that  negative sequence current of SLG fault is  Ia2 =j2.5 pu. Although for single line to…

Q: b) A fault occurs at bus 3 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

A: Part 2: ExplanationStep 1: Identify the sequence impedance parameters.- Given: - \( jX2(1) = j0.1X…

Q: The sample power system subjected to three phase fault at bus 4. The system values are given below…

A: Find explanation below

Q: Q6/ A 3-phase, 50Hz synchronous generator having H=6 MJ/MVA is delivering power of 1.0 P.U to…

A: Critical clearing angle:- It is load angle at which fault is clear and system will stable, without…

Q: A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the…

A: x=1y=7Note: reactance of element right to bus 4 is not given. Hence we will not consider that in…

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

A:

Q: In the figure below, all impedances are in per unit on a common MVA base. The generators are…

A:

Q: cance is X = ault occurs at the generator terminals. 0.20 pu. The generator is operating at rated…

A: In this question we will find magnitude of the steady state per phase fault current ...

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: In paralleling of generators, it tend to increase the generator's ____________ . a rated frequency…

A: Paralleling of generators are nothing but a method to connect two or more than two generators…

Q: B) Develop an expression, in terms of the generated e.m.f. and the sequence impedances (ZI, Z2 and…

A: Solution (B) - For phase A, the line to earth fault is shown below,

Q: he symmetrical fault occurs in the terminals of the synchronous generator. Find the direct axis…

A:

Q: The symmetrical fault occurs in the terminals of the synchronous generator. Find the direct axis…

A:

Q: Q6. Q7. Q8. Q9. When identical partially loaded AC generating units are operating in parallel on…

A: Power system:- It is an interconnection of electrical equipment which is used for power generation,…

Q: The following are the data for the unloaded synchronous generator with neutral is solidly grounded.…

A:

Q: Problem 3: An alternator and a synchronous mo- tor each rated for 80 MVA, having sub-transient…

A: Synchronous Motor: It is an electric motor in which RMF of stator and RMF of rotor get locked and…

Q: A 25 MVA, II kV generator has X"d=0.2 p.u. X2 = 0.3p.u. and X0=0.1 p.u. Tht neutral of generator is…

A:

Q: The symmetrical fault occurs in the terminals of the synchronous generator. Find the direct axis…

A: Given: Leakage reactance, Xl=7.9 Ω Armature reactance, Xad=7.7 Ω Field reactance, Xf=6.4 Ω

Q: Let the system of Figure 1 operating with mechanical input Pm at a steady angle ĉo. A three phase…

A: If a fault occurs in the system, δ begins to increase under the influence of positive accelerating…

Q: b) A fault occurs at bus 2 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

A:

Q: A 20-MVA, 13.8-kV generator has a direct-axis subtransient reactance (X") of 0.25 per unit. The…

A: Given Data:A generator with,Power rating Voltage rating Direct-axis sub-transient reactance Negative…

Q: For the following single line diagram of a three-phase system, a three-phase fault occurs at point P…

A: The fault occurs at P. Transient reactance of the motor, Xm'(pu)=1.7*0.14              =0.238

Q: Problem #2: A transformer is fed from a 100 MVA, 18 kV generator via a 5-cycle breaker. Generator…

A: Given S =100 MVA V =18 KV Xd'' =18%Xd' =25%Xd =120%

Q: In a three-phase system, a synchronous generator supplies power to a 200-volt syn- chronous motor…

A:

Q: B:A 20 MVA transformer which may be called upon to operate at 30% overload, feeds 11 KV busbars…

A:

Q: Problem 2. A 69-kV transmission circuit supplies power from a large interconnected utility to a…

A:

Q: Q14. In paralleling of synchronous generators, the machines that are to be paralleled must have the…

A: Conditions for  parallel operation of alternators (synchronous generators) : -Bus bar voltage of the…

Q: A three-phase, 100-MVA, 20-kV generator is connected to a three-phase, 100-MVA, 20-kV motor through…

A: The short-circuit current can be determined using the formula I = V / (Xg + Xl + Xm) where I is the…

Q: An alternator and a synchronous motor are rated 44.1 MVA, 14.8 kV and each has a subtransient…

A: In this question we need to find RMS value in ampere of subtransient current in the alternator…

Q: B:A 20 MVA transformer which may be called upon to operate at 30% overload, feeds 11 KV busbars…

A: Explanation:i) Operating time of feeder relay: First, we need to calculate the actual current seen…

Q: Under short circuit, the reactance’s of the synchronous generator during the  steady state condition…

A: when a fault occurs in the power system network, the currents flowing is determined by the internal…

Q: The 3-φ generator is rated 25 MVA, 13.8 kV. The positive, negative and zero sequence reactances are…

A: Among the various types of unsymmetrical fault, LG fault is the most severe fault.

Q: For the following single line diagram of a three-phase system, a three-phase fault occurs at point P…

A: G1=20 MVA1=6.9 kVis taken as base valueXg1=0.15 pu Xg2(at new base)=0.08×2025×6.96.92…

Q: B) Develop an expression, in terms of the generated e.m.f. and the sequence impedances (ZI, Z2 and…

A: According to the question we have, Develop an expression, in terms of the generated e.m.f. and the…

Q: j0.15 요 j0.15 오 j0.25 2 j0.3 2 j0.15 오 G) Loffer j0.25 2

A:

Q: O/ For the data that given in Figure below. The motor is drawing 20 mw at o.8 Pf leading at terminad…

A: First we will find internal EMF and fault currents in various sections using super position theorem.

Q: A 300-MV A 20-kV three-phase generator has a subtransient reactance of 21%. The generator supplies a…

A: Xg=0.21 , 20 KV , 300 MVAXm1=0.206 , 13.2 KV , 200 MVAXm2=0.206 , 13.2 KV , 100 MVAT1=350 MVA…

Q: Two identical synchronous machines, each rated 60 MVA, 15 kV,

A:

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

A: From the star connected synchronous generator

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.