The difference between the scheduled reactive power and calculated reactive power is called mismatch in the reactive power at the bus of a power system O True False
Q: uèstion 6 In which of the following the positive, negative, and zero sequence impedances have…
A: The detailed answer is solved below according to the given parameters and instructions in the…
Q: The synchronous generator of thermal power station will have a large number of poles O True False
A: In thermal power stations, the rotor which is used is a cylindrical rotor. In cylindrical rotor the…
Q: A synchronous generator, with synchronous reactance of 6 ohm, is connected directly to an infinite…
A: Given synchronous generator
Q: At the constant rating of a transformer or a synchronous generator when reactive power decreases the…
A: False. Solution given below.
Q: A synchronous generator in Y (star) configuration is directly connected to an infinite bus. The…
A:
Q: 10.If the number of poles is constant, how to control on the generated frequency of 3 phase…
A:
Q: The synchronous reactance of a 200 MVA, 10kV, 3-phase, 50 Hz generator is 1.0 p.u. at its own base.…
A:
Q: a load of 15 mva with power factor 0.86 lagging is given. Calculate the reactive power delivered by…
A: Given, A load of 15 MVA with power factor 0.86 lagging S=15 MVAso, P= 15×0.86=12.9 MW And, power…
Q: 1) 13.8 kV, 100 MW, 50 Hz synchronous generator having a CT ratio of 10000/5A is grounded through…
A: Choose the correct option Calculate the percentage winding from the neutral will be unprotected?
Q: Most industrial loads (Motors, Fluorescent lights) are inductive in nature and have a lagging power…
A: To select correct answer Most industrial loads (Motors, Fluorescent lights) are inductive in nature…
Q: single phase full wave half-controlled
A:
Q: 9. Two alternators each having 4% speed regulation are working in parallel. Alternator 1 is rated 12…
A: Given that two alternators are in parallel. Speed regulation of alternator is 0.04. R in pu=0.04 For…
Q: a-Calculate and draw the load current for the first two-period interval b-Calculate and draw the…
A:
Q: true or false ( answer with brief explanation ) a. The diversity in the maximum load between…
A: 1. Load factor and diversity factor both uses total maximum demand but diversity factor works in…
Q: QIS) For a power system: Line to line fault current =-j 2.5 p.u. 3-0 fault current =- j 5 p.u. The…
A: Given: Line to line fault current is -j2.5 p.u. And three phase fault current is -j5 p.u.
Q: 08. The importance of the fault analysis in a power system is, to deter Transient cor Steady state…
A: Fault analysis is done in power system to determine both transient and sub transient conditions.
Q: The maximum supply voltage (Vm) of the single phase transmission line is 210 V and the total…
A: we need to find out the momentary currrent.
Q: The reactance of the synchronous generator after few cycles of short circuit is The sequence…
A: Zph''< zph'< Zph Positive < negative< zero sequence imedances
Q: Asynchronous generator, with synchronous reactance of 4 ohm, is connected directly to an infinite…
A:
Q: For the following power system, all bus voltages are initially 1 1 pu. Then a three-phase fault…
A: The reactance diagram of the given system will be After a 3-phase fault, the fault point will be…
Q: "If Vc is equal to 2754193 and Vab is 476.3142103, the phase sequence is:" O POSITIVE NEGATIVE
A: In this question, We need to choose the correct options If VC and Vab are given then what is phase…
Q: In the system shown below, a symmetrical three phase short circuit fault occurs at 22 kV load…
A: It is given that: MVAbase=150 MVA
Q: e phase angle of the complex power is negative, then the circuit is said to be resistive. elect one:…
A: In this question we will find circuit nature if complex power phase angle is negative...
Q: The difference between the scheduled reactive power and calculated reactive power is called mismatch…
A:
Q: For a given power transfer, a delta system is associated with a larger Answer
A:
Q: 1-In series R-L circuit transients, the momentary current imm is directly proportional to the RMS…
A: In series R-L circuit transients, the momentary current imm is directly proportional to the RMS…
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: |Q8. In symmetrical fault analysis, network impedances are governed by Transmission line impedances…
A: in symmetrical fault, we do not consider ground resistance.
Q: Q15. In paralleling of synchronous generators, the Synchroscope is used to indicate the…
A: The synchroscope is an instrument which use to determine phase angle differences and relative…
Q: A distribution zone substation has a fault level of 400 MVA on the 11 kV bus. A 2 MVAR capacitor…
A: Given data, The value of system voltage is Vs = 11 kV. The value of capacitor bank is C = 2 MVAr.…
Q: High Low Q8. The importance of the fault analysis in a power system is, to determine Steady state…
A: The importance of fault analysis in a power system is to determine both steady state and transient…
Q: Q8. The importance of the fault analysis in a power system is, to determine O Transient conditions…
A: Fault analysis in power system is to determine both transient and sub transient conditions.
Q: The positive sequence harmonics component will add current to the neutral wire. Select one: O True O…
A: we know that positive sequence components are displayed by 120 degrees each other and sum of…
Q: Which of the following is the severest and has the lowest percentage of occurrence? DLG L-L 3-Phase…
A:
Q: Distribution transformers are generally rated more than 33KV. Select one: O True O False
A: Generally distribution transformers are used in low voltage transmission such as 11kv, 6.6 kv,3.3kv…
Q: In which of the following the positive, negative, and zero sequence impedances have different…
A: In case of Generators the positive, negative and zero sequence impedances have different…
Q: Single line to ground fault of a solidly grounded generator positive sequence current is j2.5 p.u,…
A: Choose the correct option Positive sequence current= j2. 5 puri Then current flow in neutral?
Q: In which of the following the positive, negative, and zero sequence impedances have different…
A: The positive sequence impedance and negative sequence impedance magnitude is same in case of the…
Q: Single line to ground fault of a solidly grounded generator positive sequence current is j2.5 p.u,…
A: For any current in the neutral = 3×zero sequence current. For single line to ground fault zero…
Q: In transmission substation, the compensation used is of both inductive and capacitive in nature.
A: To maintain a constant voltage profile in the transmission line, it is important to do compensation…
Q: Series capacitor compensation is used to reduce fault current levels Compensation of reactive…
A: In this question we will write about series capacitor compensation....
Q: Q8. The importance of the fault analysis in a power system is, to determine Steady state condition…
A: The fault analysis in power system is to determine both transient and sub transient conditions.
Q: of the receiving-end transformers. Calculate the fault current in the 2 kV feeder lines, in the…
A:
Q: A 3-phase 33 kV, 37.5 MVA alternator is connected to a earth fault on one phase at the remote end.…
A:
Q: A system consists of four idenital 400 MVA generating units feed- ing a total load of 1016 MW. The…
A: We have been asked to find power system time constant (Tp) with constants H and D So for that we…
Q: Calculate the following of the series and parallel AC network: Magnitude of the total impedance…
A:
Q: In which of the following the positive, negative, and zero sequence impedances have different…
A: In case of Generators (rotating machine) the positive, negative and zero sequence impedances having…
Q: smaller lagging reactive power drawn by a circuit, consists of_________ power factor Smaller zero…
A: The value of the power factor depends on the value of the reactive power drawn by the circuit.
Q: The major reason for low lagging power factor of supply system is due to the use of . motors.…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
Q: 7. An inductive load is shared by two identical synchronous generators A and B equally, if the…
A: When two Identical alternators A and B are sharing an inductive load equally. And if the excitation…
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- The total reactive power consumed by the three-phase load(in VAr) is??estion 9 The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV and breaking capacity 50 MVA is yet ......kA. vered -ked out of Flag question estion 10 The voltage between lines in a transmission line is the maximum value of the sine waveform. yet vered Select one: -ked out of O True Flag question O False10) In carrier current protection the purpose of the wave trap is for trapping power frequency waves trapping high frequency waves entering into generators/ transformer unit both (a) and (b) none of the above
- What is the difference between OLTC and transformersCan we improve a leading load pf using a synchronous condenser? Explain briefly your answerin one(1) sentence.A power station consists of two synchronous generators A & B of ratings 250 MVA and 500MVA with inertia 1.6 pu and 1.0 pu respectively on their own base MVA ratings. The equivalent pu inertia constant for the system on 100 MVA common base is:- (a) 2.6 (b) 0.615 (c) 1.625 (d) 9.0
- A Cock-eroft Walton type voltage maltiplier has 7 atagea with capacitance tranaformer secondary voltage is 133kv 250H. IE the load eurrent to be upplied is 6. SnA. The opt imum number of stages for the minimum voltage drop in all equal to 0.07pr. The at a frequency of (a 21 (b 18 Ie 19 te 11 Ob. b Od.s Oe da) How many MVAr of shunt capacitors are required to increase the power factor on a 10 MVA load from 0.85 to 0.9 lagging? b) How many MVAr of shunt capacitors are required to increase the power factor on a 10 MVA load from 0.90- to 0.95 lagging? c) Which requires more reactive power, improving a low power-factor load (case a) or a high power-factor load (case b)?Which of the following statements is/are true? A In purely resistive circuit, the current lags voltage. (B In purely capacitive circuit, the voltage lags current. In purely resistive circuit, the current is in phase with voltage. D In purely inductive circuit, the current leads voltage.
- 500MVA, 21KV, star connected, 3ph 50Hz synchronous generator is operating at the rated voltage, a 3ph fault occurs at its terminal. Its reactance in p.u. are 1.5 of synchronous, 0.5 of transient, 0.2 of sub transient. The transient time is 500ms and the sub transient time is 35ms. 1. What will the AC component be after 1.5 cycles?The bus bars of a power station are in two sections A and Bseparated by a reactor. Connected in section A are two 12MVA generators of 15% reactance each and to B, 8 MVAgenerator of reactance 10%. The reactor is rated 8 MVA and15% reactance. Two feeders are connected to bus bar Athrough transformers, each rated at 4 MVA and 5% reactance.Determine the maximum short circuit MVA with which circuitbreakers on the outgoing side of the transformers have todeal.In single phase power factor meter there is error due to frequency and waveforms but not in three phase power factor meter, I know the reason why?? Please elaborate properly