A generator is having an impedance of 0.93 p.u., before fault occurs in it. What is the possibility of impedance during fault?
Q: e) Explain the most harmful harmonics for power transformers.
A: Need to find most harmful harmonics for power transformer
Q: When slip of a three phase induction machine becomes negative, it will be functioning as a motor.…
A:
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: During a stable transient event caused by opening and reclosing a circuit breaker to clear a fault,…
A: During a stable transient event caused by opening and reclosing a circuit breaker to clear a fault,…
Q: In over compounded generator, full load terminal voltage is equals to no load voltage greater than…
A: In this question, choose the correct option What is full load voltage if generator operate at over…
Q: In over compounded generator, full load terminal voltage is less than no load terminal voltage…
A: The solution is given below
Q: Loss of excitation is one of the stator faults of alternator which is operational at power station O…
A: 1)Loss of excitation is one of the fault on rotor. 2)Loss of excitation is a very common fault in…
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: Choose the correct statement: (i) Slip test in an alternator is conducted at lower terminal voltage…
A: According to the given question, it is required to determine which option is the most correct for…
Q: The of transformers are neglected to draw the reactance diagram. O Shunt branches O Series…
A: 1.The reactance diagram is derived from the impedance diagram only. 2. The equivalent circuit gives…
Q: The loss of generation in a generator which is meeting a huge amount of demand in small grid is…
A: In small power plant loss of generation is directly affect the load and after the loss of generation…
Q: : A three phase alternator is rated at 120 mva,13.2 kv,0.8 pf lagging, and 60 Hz. direct axis…
A: In the given question we note that A three-phase alternator is rated at 120 MVA , 13.2 Kv Power…
Q: Question 1 A Y-connected synchronous generator has sequence reactance of Xo = 0.1pu; X1 = 0.22pu and…
A: A Y-connected generator has the sequence reactance of X0 = 0.1pu, X1 = 0.22pu, X2 = 0.36pu. Now, the…
Q: Q1/ Two generators are interconnected by a reactor of I Ohm reactance per phase. The estimated short…
A: multiple questions As per our guidlines we are supposed to do the first question if a student asks…
Q: vii. The voltage of the power supplied from the synchronous generator is fixed: (a) Due to the AVR…
A: To select correct answer
Q: Distribution transformers are generally protected from damage due to excessive internal…
A: Ans: Option C is correct. Distribution transformers are generally protected from damage due to…
Q: 1-The following sequence currents were recorded in a power system under a fault condition…
A: In this question we will find fault type....
Q: What are the short circuit test observations of three phase synchronous alternator
A:
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: The leakage reactance(XL) and the armature reactance (Xm) of the three phase unloaded alternator…
A: False
Q: A synchronous generator has 0.6 synchronous reactance. Load connected across terminal of generator…
A: Given values are - ReactanceXs=0.6OhmVtLine=230VoltVtPhase=2303=132.8∠0ocosϕ=0.8PL=500kW
Q: the slip-rings replaced by separated segments In order to generate a bidirectional Voltage true /…
A: This statement is true or false? "the slip-rings replaced by separated segments In order to…
Q: A 30-MVA alternator with 15% reactance is connected to a bus bar. A second alternator rated 25-MVA…
A: The solution is given below
Q: Which one of the following diagrams shows delta-delta connections of three single-phase transformers…
A:
Q: Three 11 kV; 20 MVA 3 plase synchronous generators are connected to common set of bus bars. Each…
A: Given V=11 kV S=20 MVA X1 =20 % X2=15 % X3 =30 %
Q: Which of the following is the rotor fault of alternator? Phase to earth Over current Inter turn Non…
A: Choose the correct option Which of the following is the rotor fault of alternator?
Q: Synchronous reactance of the three phase unloaded alternator is less than the transient reactance…
A: Synchronous reactance and transient reactance of a three phase unloaded alternator
Q: In single phase system, the performance of motor produces the uniform torque. Select one: True…
A: We need to tell about the given statement is true or false.
Q: Under Unbalanced Condition With Faults: c. Load Power Profile (Pr, QT,St,pfr);
A: Under unbalanced condition with fault We have to find load power profile Active (PT), reactive (QT),…
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: A synchronous generator of 100 MVA, 22 kV, and 0.25 pu transient reactance supplies a motor of 50…
A:
Q: two alternators A and B having 5% speed regulation are working in parallel at a station. Alternator…
A:
Q: An alternator of frequency 50.3 Hz is to be synchronized with an infinite bus of frequency 50 Hz by…
A: Given values are - Alternator frequencyfa=50.3HzBus frequencyfb=50Hz Given that alternator is…
Q: Two identical synchronous machines, each rated 60 MVA, 15 kV,
A:
Q: 3. The positive, negative and zero sequence reactances of a 20 MVA, 13.2 kV synchronous generator…
A: In this question we need to find the fault current when a double line to ground fault occurs at the…
Q: As per the standards used in power system, even harmonics are limited to 25 percent of the odd…
A: The detailed answer is solved below according to the given parameters and instructions in the…
Q: Two 75 MVA 3-phase alternator are connected in parallel. The speed load characteristic of the first…
A:
Q: How do shunt capacitor banks are protected against following abnormal conditions. i. Over-current…
A: Shunt capacitor banks are commonly used to improve the power factor of a network. They also aid in…
Q: When a fault occurs, Select one: O A. the generator terminal voltage does not change immediately O…
A:
Q: Load flow study is carried out for Stability studies Fault calculations System planning Load…
A: The load flow method is used to study the steady-state behaviour of the Power system. It gives an…
Q: Faults have been considered at the terminals of an unloaded alternator. What difference would you…
A:
Q: Describe the synchronizing sequence to bring a generator into service in parallel with a running…
A: to describe the synchronizing sequence to bring a generator into service in parallel with a running…
Q: A: A syficntonots generator of 100 MVA, 22 kV, and 0.25 pu transient reactance supplies a motor of…
A: The base MVA is SB=100 MVA. The base voltage is VB=22 kV. Before fault, the pre-fault voltage is…
Q: 13. A generator rated 30 MVA, 11 kV has a direct-axis subtransient reactance of 0.3 p.u. the…
A: Fault current=(3×pre fault voltage)/(X1+X2+X0). Where X1 =positive sequence reactance…
Q: the most common failure with item with a three-phase induction motor system is the
A:
Q: Three generators rated as follows: G1: 100 MVA, 33 KV, sub-transient reactance of 10%; G2: 150 MVA,…
A:
Q: 10. The following data pertaining to two alternators working in parallel and supplying a total load…
A: A large number of machines are connected to a grid or bus bar which decreases the frequency of…
Q: Two shunt generators A and B operate in parallel and their load characteristics maybe taken as…
A: In the question, Two shunt generators A and B operate in parallel and their load characteristics is…
Step by step
Solved in 2 steps
- In DC machines the number of parallel paths for a wave winding generator is Select one: O a. Three O b. Two OC. Half the number of poles O d. Equal to Number of PolesThe terminal voltage of a dc series generator running at rated speed and no load is equal to a very little voltage zero rated voltage half its rated voltageTwo 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 4
- To change the direction of rotation of a series wound DC generator the general rule is toThe reactance's of the alternator during the periods of steady state are given bellow, Leakage reactance(X)=0.18 ohm, and armature reactance (Xad) = 0.67 ohm. The value of the syncronous reactance during the steay state conditions is Syncronous Reactance in ohmThe terminal voltage of a dc series generator running at rated speed and no load is equal to * rated voltage half its rated voltage O zero O a very little voltage
- The reactance's of the alternator during the periods of steady state are given bellow, Leakage reactance(X)=0.18 ohm, and armature reactance (Xa)= 0.67 ohm. The value of the syncronous reactance during the steay state conditions is Syncronous Reactance in ohm1- The compole is used to 2- A 4-pole wave winding machine has ------ magnetic circuit. 3- A commutator pitch for the duplex wave winding is equal to - 4- A 2-pole triplex lap winding will have parallel paths. 5- A 6-pole lap wound generator has 900 conductors. The e.mf induced per one turn being 3V. the generated voltage of the grnerator is ( 6-A 10kW, 250 V shunt generator has armature and field resistance of 0.2 and 502 respectively. Then the generated voltage is andQuèstion 7 A shunt generator running at 1000 r.p.m. has generated e.m.f. as 300 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly 300 480 420 360 A Movinn to another ouestion will caro thic roenonco P Type here to search O O O O
- Induction motors and welding transformers require magnetizing current, which causes a. lagging power factor. b. leading power factor. c. unity power factor. d. zero power factor.Explain how the real and reactive power is controlled in synchronous generators.A synchronous generator runs at 250 rpm and generators at 60HZ. There are 240 slots each containing 5 conductors arranged in full-pitched winding for three-phase star connection. All the conductors of each phase are in series and the flux per pole at no-load distributed sinusoidally over the pole pitch is 2.5 x106 Maxwell. What is the emf induced in each winding and the terminal voltage?