Analysis Problems: Prob 1. What will happen in each of these systems to the phase voltages of the load, if one of the source phases fails open? Source Load Winding fails open! Source Load Winding fails open!
Q: In a star 3 phase connection circuit, the phase current is equal to its line current. Select one:…
A: For a star connected circuit, the current IL=Iph i.e. Phase current is equal to line current.
Q: Sketch the circuit diagram of a delta connected three phase load and mention the line and phase…
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Q: 1. Thyristor-Controlled Series Capacitor (TCSC) for power factor improvement 2. What are the…
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Q: Q- A 30 KVA, 2500/230 transformers has leakage impedance of 8%. Find the voltage to be applied on hV…
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Q: In a 390V, 57 Hz, three phase system, the value of the reactive power without capacitor bank is…
A: Given in the question: The system voltage is: V = 390V The system frequency is, F = 57Hz The…
Q: In a delta connected system, the three phase currents are mutually displaced by 120 degree. Select…
A: In the question, Consider the delta connected system, Are the three phase currents mutually…
Q: a) List the four short-circuit faults in three-phase power systems in order of frequency of…
A: Part (a): The list of the short-circuit fault in a three-phase power system in order of frequency of…
Q: The balanced system below has a phase voltage of 120 V. It supplies a balanced load coil that is…
A: Given: V=120VR=3ΩL=.011HLet…
Q: Question 7 A 415 V, 57 Hz 3-phase supply is connected to a 3-phase star connected balanced R-L load…
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Q: The single-line diagram of a subtransmision system is presented in the figure below. At point B a…
A: Three phase fault is the symmetrical fault and it is the most severe fault.
Q: "In a R-L series circuit, applied voltage is in phase with the total current." True False "In…
A: 1. impedance of RL circuit is R+jXL So, impedance angle ∅ = tan-1WLR So, current in Rl circuit…
Q: 22 (a) Three-phase generator consist of three set of single-phase generators, with voltages equal in…
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Q: A two-phase load draws the following phase current: i,(t) = I, sin (ot- 0,) %3D i,(1) = Imcos(@t-»,)…
A: Given phase currents, i1(t)=Imsin(ωt-ϕ1)i2(t)=Imcos(ωt-ϕ2)
Q: 8. Solve Prob. 7 for a delta-connected load, assuming all other conditions to remain the same.
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Q: In a 3-phase, 4-wire system, two phases have currents of 10 A and 6 A in lagging power factors of…
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Q: For the ∆-connected load, find the magnitude and angle of each phase current Iab , Ibc , and Ica .
A: In this question we need to find the magnitude and angle of each phase current Iab , Ibc , and Ica
Q: Problem 4: A three phase motor draws 30 kVA at 0.80 power factor lagging from a 480 V three phase…
A: The data are given as KVA ratingS1=30kVA,Power factorpf1=cosϕ1=0.8 laggingso, ϕ1=36.87°.1) Without…
Q: Single phasing happens when one phase of a three phase source becomes unavailable. True False
A: Given A true or false question based on single phasing condition. Please find the answer below.
Q: In a 390V, 57 Hz, three phase system, the value of the reactive power without capacitor bank is…
A: Reactive power supplied by capacitor=reactive power power to load without capacitor-reactive power…
Q: The 3 phase power is same in both star and delta connected load. Select one: True False
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Q: In a star 3 phase connection circuit, the phase current is equal to its line current. Select one: O…
A: Star Connection: This system is also known as Three Phase Four Wire System (3-Phase 4 Wire). This…
Q: The Following Test to a lloku, 2300v, Foure pole, 60t 23 Inductio motor short circuit test V = 268 V…
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Q: Compared to three-phase systems, single phase systems have O Bigger size Lighter weight O Higher…
A: The benefits of choosing a 1 phase supply are because of the following reasons- The design is less…
Q: A parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R…
A: In RL parallel connection branch resistor and inductor are connected in parallel with each other and…
Q: A 3-phase motor is rated at 100VA 0.9pf lag when operated with 100V 60Hz. The motor must be operated…
A: The 3ϕ system can be drawn as Based on the rating of the Motor, the line current drawn by the motor…
Q: A:17 0 و أبریل، ۲۰۲۱ -> O A:10 In a 385V, 59 Hz three phase system, the value of the reactive power…
A: In this question , we will find capacitance value for power factor improvement...
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: 1. Design a three-phase system with a combination of three-phase and single-phase loads.
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Q: The primary windings of three single phase transformers are wye connected and the secondary windings…
A: Write the given values. VPPrimary=2300 VVLSeconsary=230 VILPrimary=30 A
Q: B- two transformers A and B are connected in parallel to a load of (2+j1.5). Their impedances in…
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Q: Draw Wye- Delta three phase transformers connection ( no-load and full-load) in Lt-spice
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Q: Why tertiarv winding is used? Select one a To connect static capacitors for reactive power injection…
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Q: in Transitions Animations Slide Show Review View 1. A 3- phase, 30 MVA, 33 KV alternator has…
A: The solution can be achieved as follows.
Q: From the circuit below, determine secondary winding voltage Vsec if the primary winding voltage Vpri…
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Q: what are the advantages and Disadvantages Connecting transformers 3 Phase between (delta to Star)
A: Star to delta connection. In this connection, the start connection is at the primary side and the…
Q: In three phase delta connected system, the phase voltage is equal to line voltage Select one: True…
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Q: a step-down 600/480V autotranformer supplies a 10 KVA load. find the primary and secondary line…
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Q: 12.3 Determine the phase sequence of a balanced three- phase circuit in which V 440/10° V. Obtain…
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Q: Two single-phase transformers, having equal turns ratio, in parallel supply a secondary load of…
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Q: From the circuit below, determine secondary winding voltage Vsec if the primary winding voltage Vpri…
A: Given Vp = 120 Rms Transformer ratio is N1:N2 = 6 :1 Find Vsec
Q: Hello I need a full explanation about the power of y and delta connection what Is the advantages and…
A: POWER OF Y CONNECTION AND DELTA CONNECTION; The one on the left takes a better primary voltage and…
Q: Question No.33 A single phase half bridge VSI has load R = 1.8 Q and DC source voltage 130 – 0 – 130…
A: Given a single phase half bridge VSI has, Load resistance, RL=1.8 Ω DC source voltage, Vdc=130-0-130…
Q: What will happen in each of these systems to the phase voltages of the load, if one of the source…
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Q: 10. In a R-L series circuit, total current lags behind the applied voltage. True False 11. In…
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Q: A 3-phase, 20 MVA, 10 kV alternator has internal reactance of 5% and negligi resistance. Find the…
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Q: For a three-phase positive sequence ΔΔ-connected system, Vab=3.6∠56.0Vab=3.6∠56.0. Then VbnVbn is:
A: For a three-phase positive sequence ΔΔ-connected system, Line voltage value is same as the phase…
Q: In wattmeter both current and pressure coils are required. For -4 *.obtaining the required phase…
A: Here choose the given Statment is true or false? In wattmeter both current and pressure coils are…
Q: Problems > A three phase has 600 primary turns and 150 secondary turns. If the supply voltage is 1.5…
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Q: A parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R…
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- The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) FalseCombination circuit what is PT? RT? IT? Voltage Across each load?A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?
- (5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.Voltage sags due to short circuit and earth faults are the cause for the vast majority of equipment problems. Electronics equipment become more susceptible to voltage sag, hence the companies experience production stoppages. Voltage sag analysis is very complex issue. Based on voltage sag randon factors describe on it.Predict value portion, using source voltage of 3.05 and R1 = 49 ohms and R2 = 99.5 ohms “Using Kirchhoff’s parallel circuit law”
- please explain in detail how to arrive at these answers. I am not the best at using Kirchoff voltage law.What effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.Q20. The section bus-bars A and B as shown in Figure B5 are linked by a bus-bar reactors each rated at 5000 kVA with 10% reactance. On bus-bar A, there are two generators each of 10,000 kVA with 10% reactance and on B two generators each of 8000 kVA with 12 % reactance. Find the Current and MVA that fed into a dead short circuit between all phases on B with bus-bar reactor in the circuit. Page 4 of 5 جامعة التقنية والعلومر التطبيقية بإبراء University of Technology and Applied Sciences - Ibra Student ID: Section: Student Name: 8,000 kVA 12% 10,000 kVA 10,000 kVA 10% 8,000 kVA 12% 10% 2 3 5,000 kVA 10% lell 8,000 kVA 10% Figure B5 "End of Question Paper"
- 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.3. Peak time is the time required for the response to reach the first peak of the overshoot. * True False 4. The loops called non toughing loop if they have many node in common. True False 5. First type system has a zero static steady state error when the input function is a step function. * True FalseQ-3 A Cockeroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1 µF. The supply transformer secondary voltage is 100 kV at a frequency of 60 Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop.