Voltage V, V RN BN YN Time 360 180° 270 90 Figure 11: Three Phase Voltage Supply ZAS VRN VRY S Zes VYN VeN Figure 12: Star connected (balanced) load
Q: 6. In the balanced 3-phase system of Figure 2, determine the RMS phase and line voltages and…
A: For Three phase balanced load system The calculations are straight forward
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Q: 2. Suppose a voltage v(t) = A sin (300t + A1°) volts is applied to a single phase load and the…
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Q: 3. AS KVA, 200/400 V single-phase O.C. test: 200 V applied to primary; power absorbed 72 W S.C.…
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Q: 1. Refer to Figure 1. A Y-connected source supplies balanced 3-phase loads. The source has voltag…
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Q: 4- An out balance three phase star connected load has the following complex Currents i A, I, =le…
A: In this question we will find neutral current...
Q: 01: Calculate the phase currents in the balanced three-phase circuit shown in figure below. 1+12 2…
A: In this question we need calculate a phase current.
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: Figure 1 shows a balanced three-phase source supplying a balanced three-phase load. va 240V V. XL3…
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Q: • Choose the correct answer: 1. These substations are usually located at the generating stations a)…
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Q: The figure shows a 3-phase balanced positive sequence electrical system. The current laa = Balanced…
A: The current IaA=Vz=230∠14010∠65o=23∠75o
Q: H.W3 Calculate the reading of each wattmeter in the circuit shown in Figure 5. The load impedance Z…
A: Given: Load impedance, Z=40∠-30°
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Q: The figure shows a 3-phase balanced negative sequence electrical system. Vcn = 200 /0° Vrms. Vbn =
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Q: A balanced star connected load is supplied from a symmetrical 3 phase, 400 V system. The current in…
A: A balanced star connected load is supplied from a symmetrical 3 phase, 400 V system. The current in…
Q: You tasked by a company to estimate characteristics of a 3-phase machine. The machine is illustrated…
A: Given parameters are: Line Voltage,VL=460V Frequency,f=60Hz Number of poles,p=4 Per phase…
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A: In this we will write about power measurements using one wattmeter method....
Q: A 40 ohms resistor and a 10 mH coild are in parallel across an 80 V, 500 Hz ac line. Find the (a)…
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Q: A balance albc-seq ven ce Y-connected source with Van- idoL30'v Y-connected source with Van=…
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Q: Two compound generator A and B fitted with an equalizing bar supply a total load current of 350 A.…
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Q: If the phase voltage of the three generators are given as below, state whether they are balanced or…
A: All three phases of the generators are given as: For the three-phase system to be balanced, the…
Q: Please answer this exrcise with equations
A: General formula for 3-phase transformer:
Q: Question 3 A 30, Y-A system with a negative phase sequence and Vbc = 320 L 25° V at 60 Hz, has the…
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Q: The voltage between two phases in a balanced three phase-system (4 conductors) is U = 660V. The…
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Q: 5. Given the balanced 3 phase system shown below. Determine v,(t) and i,(t) . 10.1 le 350 E. = /45°…
A: Balance 3 phase system then determine v(t) and i2 (t) ?
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A: Dear student as per Bartleby guidelines I can not give answer more than three subparts of the…
Q: Q9. To represent the balanced single phase power systems, the systems should be connected in O delta…
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Q: Balanced In 3-phase star-star connection, 2 equivalent loads are connected in parallel. Va(t)…
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Q: A building is supplied by a public utility at 4,16 kV tains three balance the three-phase lines: (a)…
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Q: Activity 5.1 1. On a 120/208-v four wire Y system, two lamps are connected from phase A to neutral,…
A: “Since you have asked multiple question, we will solve the first question for you. If you want any…
Q: 1.Three inductive loads each of resistance 40 ohms and inductive reactance 30 ohms are connected in…
A: In this question we have to find out phase voltage , phase current , power factor and total 3 phase…
Q: current - 1=?, and the power factor - cosp =?. 4. An out of balance three phase star connected load…
A: In this question we need to find a RMS current through neutral .
Q: 12. Refer to the circuit below. The alternator has a line voltage of 240 V and the load has an…
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Q: phase sequence three-phase wye-wye system as shown figure 1. 610° 2 I Aa 200|–20° V V AN N V BN VCN…
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Q: 5. Calculate the line currents in the following 3-phase unbalanced system. Find the active, reactive…
A: Given circuit is ,
Q: 4. An out of balance three phase star connected load has the following complex currents: I₁ = le¹j⁰,…
A: Note: We are authorized to answer one question at a time since you have not mentioned which question…
Q: Two compound generator A and B fitted with an equalizing bar supply a total load current of 350 A.…
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Q: P The phase currents in a four-wire wye-connected load are as follows: 5л Î, = 1020 A, ÎL = 12/ I, =…
A: In a wye connection, the current in the neutral wire is the sum of currents in the 3 phases.
Q: The one-line diagram of a three-phase system is shown in Figure 1. By selecting a common based of…
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Q: In a balanced three-phase system Ve = 120/25° V. What is Vab?
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Q: A delta connected load (Figure 2) has an impedance Z is (12 + j35) ohms. If the applied VAB voltage…
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Q: The figure below shows a single phase power system with the following details. Generator G1: 12 kVA,…
A: The specification of the component connected in the power system as follows. Generator G1: 12kVA,…
Q: 1Ω 2 mH A 16 Ω ll 100/0° V 2 mH B 133 µF 100/120° V b ell N 100/-120° V 1Ω 2 mH C 27 mH A…
A: In the 3 phase unbalanced load supplied by The balance load. Find the current Iab And IbB We are…
Q: 56. A three-phase 75 kVA, 440-V, 0.8 lagging pf load is to be supplied by three single-phase…
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Q: Question 2. Given a balanced 3-wire, three phase system serving the following loads: Vab = 200 < 0V…
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Q: A three phase star connected motor draws 5.6kW at 220V and it takes line current 18.2A, then the…
A: Power P= 5.6Kw Voltage v= 220 V CURRENT I =18.2A
Q: Two compound generator A and B fitted with an equalizing bar supply a total load current of 350 A.…
A: i1+i2=350 A Now, 220-V0.02+225-V0.01=35011000-50V+22500-100V=350V=221 V currents in each series…
Q: 4. A delta connected balanced load is connected to a 3 - phase, 400 V supply. The line current is 35…
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Q: e figure shows a 3-phase balanced positive sequence electrical system. The current Ipg = a A…
A: Line current = Phase current
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- Determine the short-circuit current ISC3,0.4kV for a 3-phase short- circuit fault at F. Give your answer up to 2 decimal in kA but do not enter the unit in your answer. Transformer T1 Transformer T2 Cable C1 Isc3,6.6kV Isc3.0.4kV O + j0.150 F 1 MVA 2 MVA 22/6.6kV 25 MVA fault level 6.6 kV/400V Z=3% 6.6 kV switchboard 400 V switchboardConsider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.Does an open connection permit balanced three-phase operation? - (a) Yes (b) No
- 7. Three load units A, B, and Care connected in parallel and take currents that are respectively 11 A, 10A and 15A. Assuming IA to be the reference phasor, IB leads IA by 30degrees and IC legs behind IA by 65degrees. Calculate the total (resultant) currentand angle it makes with the x-axis.full-J ea1 The Primary aed Secondary windings of Single- Phase thinsforman respetivedy tk leakage reactance of the trancfomar reffend Ao LA Primary side is 35. a 40 KUA, 6fo0 /250V have resistanee of lo-n and o.02- the Calculate the fercantage Voldage regulati on o f the the Transformar when Laad cumud at afS.ofog laggiug . こ。 Supply Sel ans Val tage drop = 243V % volfange requlak jan = 3.7% シ s( 2. Prim scond ex 2 Tk Primapy and second ary windings of Single-Phese Tans fermar heve resishance of 1ón and o.022 respectivedy. The Leakage Vactanee af the transfeoramar refferred to the priary is 35A calculate @ The primary voltage vequired to circulat full-bad caml when Ahe secoudanery is short-ciraul ted Z Th f wAl -Load requlation at os Lagging Meglet the No-Loud currat Sell, is =256V a 40 kuA , 6fon /esovAssume a transformer rated 700 MVA with 145 kV on the secondary side. Determine the base current and base impedance. For the one line diagram shown, determine the pu reactances and draw the reactance diagram choosing 100 MVA and 20 kV as base values for generator. T1 T2 1 Vm Line G M G1- 60 MVA, 20 kV, X= 9% T1- 50 MVA, 20/200 kV, X =10% T2- 50 MVA-200/20 kV, X=10% М-43.2 MVA, 18 kV, X-8% Line- 200 kV, Z= 120+j200 ohms. 2.
- 5. Obtain the symmetrical components of a set of unbalanced currents I,=1.3225º, I,=0.862180° and I,=0.99 1320In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generator is connected in star with its star points grounded. The per unit impedances of each element on a 40 MVA base are given in Table 1 and the voltage levels are given in Table 2. Z [p.u.] 0 2 tööt Generator 0.01 +j0.08 p.u. L Figure 1: A section of the distribution system Transformer T1 Line V BASE [KV] 0.04 + j 0.03 + j 0.15000000000000002 0.06000000000000000 Generator Table 1: Sequence impedances (p.u. on 40 MVA base) 3 T2 181. Line 3 10 Table 2: Voltage bases (kV) Load 1 Transformer T2 Load Current A load current of 11.316 kA is flowing with a lagging power factor of 90 %. Convert this to a current vector in per-unit. IL = 0.04 + j 0.06000000000000000In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generators are connected in star with thier star points grounded. The system base is 15 MVA. The transformers all have reactances of 0.04 p.u. on this 15 MVA base. The reactances of all other elements are given in Table 1 (in 2) and the voltage levels are given in Table 2. p.u. G1 p.u. T1 jö Per-Unit Convert all values to p.u. on a 15 MVA base. Xa= p.u. Xc₂= XL = V BABE G1 2 X 9 T3 Figure 1: A section of the distribution system T1 L Table 1: Sequence reactances (2) 3 G1 L G2 0.3 0.59 0.01 4 L 9/10 10 Fault Voltage What is the voltage at bus 3 (in Volts) after the fault has occurred? Vp= V T2 5 T2 34 10/4 Table 2: Voltage bases (kV) G2 4 T3 10/9 | G2 Fault Current A three-phase fault with a fault reactance of 0.01 p.u. occurs at bus 3. Calculate the fault current flowing at the fault point in KA. Ip=-j KA So
- A parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R = 10 ohms, L = 20mH and frequency of 1000rad / s, the current measured is 2.2361A at 89.44 leading power factor. A) Determine the initial capacitance. B) However, a fault occurs on the capacitor branch making its capacitance 20% lower and a resistance of 5 ohms is detected. If this faulty circuit is rerun but at a frequency of 500 rad / s, determine the new current that will flow through the circuit.A 15-kv, 35-kVA 076PF laggny 50H2 four Pole y-connected Stea-thrbine genevaty has a Synchronons reactane of 3.5on Per phase. Ihis genevatuu is operativg in parallel with large power System (Infnite'bus). O Sketch Hhe corespouding Phasor diagrum and calcula te frr the armatune current (assume the fel Currut is unchanged ). O At the alsolute powev Possille, how much reactive Pover will this generator be supplyng a Consummg?e = 0 Q1: What does happen if we change two currents? a. Q2: What does happen if we have a three-phase four poles machine? Q3: What does happen if we have a two-phase two poles machine? e = 0 Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali Ki. pw --