An alternator having normal current of 100A is to be protected by unit protection using stabilizing resistor. The through faulty stability is estimated at fifteen times the full load current. Assuming that one of the transformers gets completely saturated, CT Ratio=100/1, CT winding resistance=0.051 ohms and total load burden=104 ohms. Calculate the required value of the stabilizing resistor and the stability ratio given also that the relay pick up

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A: Dear student, Since you have posted multiple questions, we will provide the solution only to the…

Q: Two three-phase, 6.6 kV, Y-connected synchronous generators are operating in parallel to supply a…

A: A) Given:Vt=6.63kV=3810 VZA=j10ΩZB=j12ΩTotal load of 3000 kW at 0.8 p.f. laggingPT=3000 kWQT=3000…

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 50 MVA, 11 kV synchronous generator has internal reactance of 0.8 Q. The generator is connected to…

A: In this question we have to find out per unit impedance of generator when connected to new power…

Q: /During the test of shunt excited generator the voltage initially must be adjusted to 220V . then…

A: When the test of the shunt excited generator, the voltage initially must be adjusted to 220 v. then…

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

A: Given Leakage reactance(Xl)=  7 ohm, Armature reactance (Xad)= 7.4 ohm field reactance (Xf)=4.2 ohm.

Q: Q: (A): Draw the general per-phase equivalent circuit of a two-winding (2-phase) motor, based on the…

A: to explain symmetrical stator winding

Q: The sum of the armature reactance  and.............reactance  is the reactance of the synchronous…

A: ARMATURE REACTANCE AND LEAKAGE REACTANCE   The armature reaction reactance and the leakage reactance…

Q: I already solved for the 0.8pf lagging. My question is for voltage regulation with 0.8pf leading!…

A:

Q: en 1 In dc generator, is used to convert the alternating current produced in the armature conductor,…

A: Q. 1 Ans:- Commutator  Explanation :- Commutator convert AC voltage to DC voltage and vice versa.…

Q: Q5 An 11 kV three-phase 5 MVA, star-connected generator is protected by an earth- fault relay having…

A:

Q: None

A:

Q: The reactance's of the alternator during the periods of the subtransient, transient and steady state…

A: As damper winding time constant is very less so damper winding is out of circuit at the end of the…

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: An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10.…

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 Y- connected, 10-KVA, 230- has a field winding resistance of 4.59. At an operation of 0.85 lagging…

A: Given data KVA rating, S=10 KVA Field winding resistance, rf=4.59 Ω Power factor, cosϕ=0.85  lagging…

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

A: Find the symmetrical fault current  Total Reactance?  If the armature Reactance Xa 7.4ohm Leakage…

Q: Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star…

A: Given:3-phase synchronous generator, 4.6 kV, 500 kVA, 60 Hz, 4 poles, star connection, synchronous…

Q: In small transformers, the total iron losses may vary from _____________________ % of the rated…

A: In small transformers, the total iron losses may vary from 0.8 to 1.5 % of the rated output.

Q: Current transformers of current ratio of 1000/5 A are used for protection of a star connected 3…

A: We have an current transformer with, Current ratio = 1000/5 Voltage (VL) = 6.6 KV = 6.6 * 103 V…

Q: synchronous machine is

A: According to company policy expert can solve only 3 subparts, other subparts u need to again summit…

Q: When identical partially loaded AC generating units are operating in parallel on governor control,…

A: Since you have posted multiple different questions, we will solve the first question for you. To get…

Q: 9. While conducting short short circuit test in a transformer, which side is short circuited?

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: 2- Why it's imporctical carry out actual load test on large rating transformers ?

A: As per Bartleby guidelines we are allowed to solve only one question, please ask the rest again.…

Q: A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by circulating current protection,…

A: We have an Star-connected alternator with rating as, 10 MVA = 10 * 106 VA 6.6 KV = 6.6 * 103 V Star…

Q: Q1. The following figure. Current transformers have A RATIO (CTRS)of 400/5 and no error. Relay time…

A: The given figure is shown below: It is given that: CT Ratio=4005Relay time characteristics for…

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

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Q: QA three phase, 440V, 4-pole, 50Hz, IM, has a star connected winding requires 19.68A- at full load…

A: Given: I=19.68A, s=0.03, pf=0.8, PNL=1200W, INL=6A, PF+W=300W,R1=0.8Ω perPhase.

Q: Outline with the aid of a suitable diagram the necessary power conversion stages required to…

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A: Since you have asked multiple questions in a single request, we will be answering only the 1st…

Q: A 600 KVA generator with X"a = 0.22 per unit is connected to a bus through a circuit breaker, as…

A: For Generation(here the line volatge is zero)600 KVA 2.5 KVX"d=0.22 pulet base MVA =200 KVA =0.2…

Q: 230 induced omf tion of this p ower. In a short conpound generator, the terminal voltage is…

A: Calculating shunt current If=VTRfIf=230 V92 ΩIf=2.5 A Calculating armature current…

Q: Sketch the complete per-phase equivalent circuit of a symmetrical non-salient pole three-phase…

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A: Voltage regulation is a very important factor in a transformer, it is necessary that the regulation…

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

A: direct axis reactance is calculated by Xd=X1+Xad X1= 0.15 ohm Xad=  0.168 ohm

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.