Hw2.1-3: Derive the following: ing. The shift angle of line voltages for delta/star transformer using drawing.
Q: 1. Consider a three-phase transformer with a rating of 700 MVA and a secondary voltage of 145 kv.…
A:
Q: 1- The transformer called step-up transformer, when the number of. greater than winding winding.
A: As per our policy i have attempted only one question Step-up transformer: Step up transformer is a…
Q: Q2/A/ What are the conditions for satisfying parallel operation of single phase transformer? Deduce…
A:
Q: electrical what is the disadvantages of potential transformer ?
A: Potential transformer : The definition of a potential transformer is a device used to transmit…
Q: Consider Figure 1 of the text. For an ideal phase-shifting transformer, the impedance is unchanged…
A: Referring to the given hints, the impedance of the secondary side seen from the primary side:
Q: True or False? There are fewer number of turns in Y-Y transformer required than in delta-delta…
A:
Q: Explain the open circuit test on single phase transformer.
A: Open circuit test :- It is carried out at rated frequency & rated voltage to determine the core…
Q: The full load voltage drop in a single phase transformer are 2% and 4% due respectively to…
A: Given values are - Voltage dropR%=2%%R=2%Voltage dropX%=4%%X=4%
Q: Q2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for…
A: Per unit system:-Per unit system is the value expressing system used in an electrical Power systems…
Q: Q3) What are the elements finding from no-load test of single phase transformer?
A: At no load test rated voltage is applied with secondary open circuited. At no load only magnetizing…
Q: "Under saturated core condition, transformer become a source of harmonics" True False
A: In this question , we will write about harmonics in transformer..
Q: 1. What is the difference between power transformer and distribution transformer in core losses and…
A: Power transformers are generally high voltage transformers which are used stepping up and down of…
Q: A 3-phase transformer bank will be created with three 600 VA, 120/240 v one-phase transformers.…
A: 3 single phase transformers are connected to form a 3-ph. transformer. Rating of single phase…
Q: A 40000-KVA, 25000-V/600-kV, single phase transformer has the following series impedances: Z1=…
A:
Q: Consider that three single-phase transformers are connected as Delta in the primary and Wye in the…
A:
Q: What conclusions you can come up with after implementing open circuit test on single phase…
A: Conclusions from open circuit test on single phase transformer
Q: Derive physically the reason of the phase shift in three phase transformer and show the phase shift…
A: The given problem can be laid down into parts. Firstly, the reason of the phase shift in the three…
Q: Q2: Draw the circuit diagram, write down the governing equations, and draw the phasor diagram with…
A: Equivalent circuit diagram. Let the turn ratio is a,
Q: Why do we represent leakage flux in a transformer by inductive reactance? 2. What will happen if…
A: In the transformer, the magnetic flux is produced by both the primary and secondary winding…
Q: With the neat diagram explain the construction and working of Sumpner’s or Back –to-Back test of…
A: Step-1 Construction The Sumpner’s or back-to-back test of a single phase of a transformer…
Q: 1. Consider a three-phase transformer with a rating of 700 MVA and a secondary voltage of 145 kv.…
A:
Q: Questions:- 1. What happen when the two transformers are operated in parallel having un equal turn's…
A: According to the bartleby's guidelines we have to solve only one question posted by students so…
Q: The one line diagram of power system is shown in Figure Q.1. Use a common base MVA of 100 MVA and…
A:
Q: We wish to connect a 6 kVA, 120/240 V transformer as an autotransformer to a 120 V source to supply…
A: "Since you have posted a question with multiple sub parts we will solve first three subpart for you…
Q: what is the Formulae of short test of single phase transformer and Formulae to determine efficiency…
A: If, Wsc = Full load copper losses Isc = short circuit current Vsc = short circuit voltage Equivalent…
Q: 4. What do you mean by transformer connection Ydl and Dy11?
A:
Q: 1-which side is short cct.in short cct. test ? why? 2- Draw the exact equivalent circuit of the…
A: Answer(1) A short circuit test is conducted to find out variable losses in the transformer. So, to…
Q: . - what information could be obtained from open circuit test on single phase transformer? · what is…
A: Open circuit test is also known as No load test. It is perform by opening the primary of transformer…
Q: Discuss the potential transformer with neat schematic diagram.
A:
Q: In the transmission system shown in the figure above, the rated kVA of transformer 1, T1, is 1000…
A:
Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and…
A:
Q: Determine: A2rdg, A3rdg, IL(ave), PL(ave), & turn ratio of transformer
A: For a given circuit, Vp(rms) =220 V f=50 Hz A1 =400 mA load resistance RL =120 Ω
Q: Q1: What is the influence of transformer connections in single-phase transformers connected for 3-…
A: According to the Bartleby guidelines “Since you have asked multiple question, we will solve the…
Q: Three Phase Transformer connections: Discuss Fully the various methods available for transforming…
A: The methods of transformation of a 3-phase voltage into higher or lower 3-phase voltages is done…
Q: Consider a 3-phase transmission line operating at 66 KV and connected through a 1000 KVA transformer…
A:
Q: The figure below shows the equivalent circuit of a nominal 240V-120V, 1000 VA, single-phase…
A:
Q: at happens if one phase of a 3-phase transformer fails?
A: Primary delta connected and secondary star connected: If the primary (delta) side loses one phase of…
Q: Explain the difference between transformer equivalent circuit and IM equivalent circuit.
A: Equivalent circuit- An equivalent circuit is a simplified circuit (or model) that is easier to…
Q: Justify if in a Yy transformer (without neutral wire on the supply side) there are homopolar…
A: Here it is mentioned that in a three Yy transformer there are homopolar components of fluxes,…
Q: a) Discuss two (2) advantages and disadvantages of using three single-phase transformers instead of…
A: NOTE: Since you have asked multiple questions, we will solve the first question for you. If you want…
Q: Let a 5-kVA, 400/200-V transformer be approximately represented by a 2-2 reactance referred to the…
A: Equivalent model oftransformer- Since no load current is very small 2 to 5% of full load current. No…
Q: During the load test of single-phase transformer, when the secondary terminal voltage increases, the…
A:
Q: A single-phase transformer, working at unity power factor has an efficiency of 90 % at both…
A:
Q: Q2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for…
A: PU system: Per Unit system is a quantity expression system used in an electrical power system which…
Q: A 50-kVA 13.8-kV/208-V (rms, line-line) ∆ − Y three-phase distribution transformer has a per unit…
A: Given,High voltage side, line voltage(Base) =13.8 kVApparent power (S)(Base)=50 kVAa) As primary is…
Q: A 60-MVA, 280-kV/500-kV, single-phase transformer has the series impedance referred primary side is…
A: Base impedance=Vbase2MVAbase. per unit impedance=impedance in ohmsbase impedance.
Q: The per-unit system calculations method allows to: Select one: O a. improve the efficiency of the…
A: In the power systems analysis, Per Unit values are defined for per phase only not for 3 phase . A…
Q: Q2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for…
A:
Q: A 50-MVA, 190-kV/500-kV, single-phase transformer has the series impedance referred primary side is…
A: Given single phase transformer with50 MVA,190-kv/500-kvSeries impedance referred to primary side…
Derive the following
Step by step
Solved in 3 steps with 3 images
- Consider three ideal single-phase transformers (with a voltage gain of ) put together as three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for Va,Vb, and Vc find Va,Vb, and VC. in terms of Va,Vb, and Vc, respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express IaIb and Ic in terms of IaIb and Ic respectively. (C) Let S and S be the per-phase complex power output and input. respectively. Find S in terms of S.Q1:- What is the influence of transformer connections in single-phase transformers connected for 3- phase operation. Q2:- Prove that neutral current can flow only if zero-sequence currents are present.in distribution transformers; What is 30 degrees phase shift in delta-star connection? What are the disadvantages? (can you explain with drawing?)
- The single line diagram of a power system is shown in Figure Q2.1 includinggenerator and transformer winding connection and earthing details. The parametersfor this system have been calculated on a common 100 MVA base and are given inTable Q2.1. All resistances and shunt susceptances are neglected. This systemexperiences a single line to ground fault at a point F on line L1. The point F is at adistance d from Bus 4 along the line L1. The total length l of the line L1 is 50 km.Note that the location of d is not drawn to scale in Figure Q2.1. The fault current atthe fault point F is measured to be 6.106 kA. i) Determine the zero, positive, and negative sequence Thevenin equivalentimpedances as seen at the fault point F. These should be evaluated in per unitand shown as a function of d.ii) Use the sequence impedances calculated in part (i) to determine the distance dof the fault (in km) from Bus 4. It's different from the answer, please don't send itQ2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for the problem given in part (b) that PU impedance of the circuit element connected by the transformers expressed on a proper base will be same if it is referred to either side of a transformer.No-load operation and short circuit tests were performed on three-phase, 50 Hz 480/220 delta / Y connected transformer. In these testsThe line voltage, line current and three-phase total power have been measured from the high voltage windings and the test results are below.pictures. 100 A DC current when 1.08 V DC voltage from non-transferable software is applied to the low voltage windingshas attracted.Find the single phase equivalent circuit parameters of this transformer.idle test:Voltage: 480V Power:114w current: 0.71Ashort circiut test:V: 10v P: 78w c: 18.3a
- Three zones of a single-phase circuit are identified in the figure. The zones are connected by transformers T₁ and T2, whose ratings are also shown. Using base values of 100 kVA and 240 volts in zone 1, draw the per-unit circuit and determine the per-unit impedances and the per-unit source voltage. Then calculate the load current both in per-unit and in amperes. Transformer winding resistances and shunt admittance branches are neglected. Zone 1 Zone 2 Vs = 220/0° volts 3---38 T, 30 KVA 240/480 volts M 0.10 p.u. Xoa Xune = 2 fl T T₂ 20 kVA 460/115 volts Xeg = 0.10 p.u. Zone 3 ww Zload = 0.9 - 10.20Q2) In the network in the figure below Y-Y connected transformers, each with grounded neutrals, are at the ends of each transmission line that is not terminating at bus 3. The transformers connecting the lines to bus 3 are Y-A, with the neutral of the Y solidly grounded and the A sides connected to bus 3. All the line reactances shown in the figure between busses include the reactances of the transformers. Zero sequence values for these lines including transformers are 2.0 times those shown in the figure. Both generators are Y-Connected. Zero-sequence reactances of the generators connected to bus 1 and bus 3 are 0.04 and 0.08 per unit, respectively. The neutral of the generator at bus 1 is connected to ground through a reactor of 0.02 per unit; the generator at bus 3 has a solidly ground neutral. Find the bus impedance matrices (¹), (²), z for the given network and 'bus' 'bus' bus then compute the Subtransient current in per unit for a single line-to-ground fault on bus 2 and the fault…3.26 A bank of three single-phase transformers, each rated 30 MVA, 38.1/3.81 kV, are connected in Y-A with a balanced load of three 1 N, Y-connected resistors. Choosing a base of 90 MVA, 66 kV for the high-voltage side of the three-phase transformer, specify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
- Q2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for the problem given in part (b) that PU impedance of the circuit element connected by the transformers expressed on a proper base will be same if it is referred to either side of a transformer. (b) A 3-phase, A-Y transformer with rating 100 kVA, 11 kV/400 V has its primary and secondary leakage reactance as 122/phase and 0.052/phase respectively. Determine the PU reactance of transformer referred to primary side and then secondary side to prove that it will be same.What is the maximum current-carrying capacity of a wire or cable?A. OvercurrentB. EnergyC. AmpacityD. Surge CurrentExplain whyThree zones of a single-phase circuit are identified in Figure. The zones are connected bytransformers T1 and T2, whose ratings are also shown.Using base values of 30 kVA and 240 volts in zone 1:a. draw the per-unit circuit and determine the per-unit impedances and the per-unitsource voltage.b. calculate the load current both in per-unit and in amperes. Transformer windingresistances and shunt admittance branches are neglected.