Explain the following items i) Steps used to draw the equivalent impedance diagram of the network ii) Objective of using per unit iii) Shunt element of transmission line capacitance and the magnetizing impedance of transformer are neglected
Q: 1. Consider a three-phase transformer with a rating of 700 MVA and a secondary voltage of 145 kv.…
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Q: Explain RVDT (Rotary variable differential transformer) in brief with neat sketch.
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Q: Three zones of a single-phase circuit are identified in Figure. The zones are connected by…
A: per unit system The ratio of actual value to the base or reference value in the same unit is called…
Q: A three phase Y/A transformer rated at 50 MVA, 230/34.5 kV is to be protected using biased…
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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: 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: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent…
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Q: 1) What are the advantages and disadvantages of 3- phase transformers over 3 single-phase bank of…
A: 1.) The advantages of 3- phase transformers over 3 single-phase bank of transformers are as follows:…
Q: Problem-13 A50-kVA, 13,800/208-V, 4-Y distribution transformer has a resistance of 1 percent and a…
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Q: A10 The transformer rating is usually expressed in terms of kVA. (TRUE/FALSE)
A: The above statement is TRUE. The transformer rating is expressed in terms of KVA.
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: The efficiency of transformer is maximum at 10O0% loading? * True False
A: The given statement is a false statement.
Q: (B) / Draw the simplified equivalent circuit of single phase transformer referred to primary an…
A: In this question , we have to find simplified equivalent circuit of single phase transformer…
Q: A I0 kVA, single-phase transformer has a turns ratio of 12:1 and is supplied from a 24 kV supply.…
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Q: 1_ For an unbalanced load connected to a yy transformer, what would be the form/ shape of the output…
A: According to the question we have to discuss about, For an unbalanced load connected to a yy…
Q: A 40000-KVA, 25000-V/600-kV, single phase transformer has the following series impedances: Z1=…
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Q: Consider that three single-phase transformers are connected as Delta in the primary and Wye in the…
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Q: Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage…
A: I have solved for both parts
Q: The meaning of a star-delta connected transformer in a zero sequence network of a 3-Phase power…
A: This solution discusses about the zero sequence network of a 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: "The per unit value of impedance, voltage and current of a transformer are not same regardless of…
A: Per unit value is given as Per unit = actual value / base value
Q: 1. Consider a three-phase transformer with a rating of 700 MVA and a secondary voltage of 145 kv.…
A:
Q: Explain the importance of transformer and basic insulation level in the distribution system. Justify…
A: The detailed answer to the given question is solved below according to the given parameters and…
Q: Refer to the following components of a radial transmission system, listed in sequential physical…
A: Given Generator G ,Transformer 1,Line and Transformer 2 are connected in sequential physical order…
Q: What's The relation between turn ratio current ratio annd voltage ratio(if it exists) for single…
A: The transformer is a static device that steps up or steps down the voltage depending upon the turn…
Q: What are the advantages and disadvantages of Back To Back Test on Two Similar Single Phase…
A: When we require to test large transformer for determining their efficiency, temperature rise and…
Q: 4. Write a conclusion for the experiment, stating the role of core loss.component and magnetizing…
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Q: (b) A 3-phase, A-Y transformer with rating 100 kVA, 11 kV/400 V has its primary and secondary…
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Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and…
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Q: Three single-phase two-winding transformers, each rated 25 MVA, 54.2/5.42 kV, are connected to form…
A: The explanation is as follows.
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: Q4(b) A 200-MVA 15/200-kV single-phase power transformer has a per-unit resistance of 1.2 percent…
A: Firstly the exact equivalent model of a transformer is as shown below:
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: Consider the occurrence of single line-ground fault at the neutral end of a Y connected primary…
A: Consider the occurrence of single line ground fault at the neutral end of a Y connected primary…
Q: Figure 1 shows the schematic diagram of a three phase radial transmission system. The ratings and…
A: Circuit Configuration, we have :
Q: Which of the following is/are true? a) Base current is proportional to base VA b) Base VA is the…
A: In this question , 4 statements is given about transformers..We have to find out which is true.
Q: A generator is connected through a 20 MVA, 13.8/138 kV step up transformer, to a transmission line.…
A: Given- MVA rating of generating station=20 MVA & KVA rating of generating station=13.8 kV MVA…
Q: In a star-delta phase shifting transformer, the zero sequence currents cannot flow through the it…
A: In a star-delta phase shifting transformer, the zero sequence currents cannot flow through the it.
Q: During the load test of single-phase transformer, when the secondary terminal voltage increases, the…
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Q: A 50-kVA 13.8-kV/208-V (rms, line-line) ∆−Ythree-phase distribution transformer has a per-unit…
A: Dear student as per our guidelines we are supposed to solve only one question in which it should…
Q: Per-Unit System 3) If a 250MUA,11/400 KU, Three-Phase power Transformer has Zpu of 0.05 pu on the…
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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) The per unit voltage regulation when the transformer delivers full-load current at a power…
A: A transformer is an electrical machine which is used in AC circuit to either step up or step down…
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: TRUE or FALSE: Purchasing three single-phase transformer bank cost less than one three-phase…
A: In this question we will write in which connection cost is less i.e Purchasing three single-phase…
Q: Q2. (a) Explain what is per unit system? What are the advantages of per-unit computations? Prove for…
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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…
The first question has been solved.
Qii?
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- Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance Xeq=0.10perunit, are connected to form a three-phase bank. The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected (a) in with American standard phase shift or (b) in Y with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+j2.0) ohm. The equivalent series impedance of the transformer is (1.0+j2.5) ohms referred to the high-voltage (primary) side. The transformer is delivering rated load at a 0.8 power factor lagging and at a rated secondary voltage. Neglecting the transformer exciting current, determine (a) the voltage at the transformer primary terminals, (b) the voltage at the sending end of the feeder, and (c) the real and reactive power delivered to the sending end of the feeder.Three single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a three-phase Y- bank with a balanced Y-connected resistive load of 0.6 per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance RL in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
- A 130-MVA,13.2-kV three-phase generator, which has a positive-sequence reactance of 1.5 per unit on the generator base, is connected to a 135-MVA,13.2/115Y-kV step-up transformer with a series impedance of (0.005+10.1) per unit on its own base. (a) Calculate the per-unit generator reactance on the transformer base. (b) The load at the transformer terminals is 15 MW at unity power factor and at 115 kV Choosing the transformer high-side voltage as the reference phasor, draw a phasor diagram for this condition. (C) For the condition of part (b), find the transformer low-side voltage and the generator internal voltage behind its reactance. Also compute the generator output power and power factor.The leakage reactance of a three-phase, 300-MVA,230Y/23-kV transformer is 0.06 per unit based on its own ratings. The Y winding has a solidly grounded neutral. Draw the per-unit equivalent circuit. Neglect the exciting admittance and assume the American Standard phase shift.Reconsider Problem 3.64 with the change that now Tb includes both a transformer of the same turns ratio as Ta and a regulating transformer with a 4 phase shift. On the base of Ta, the impedance of the two comp onents of Tb is jO.1 per unit. Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive pors.
- 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.For developing per-unit equivalent circuits of single-phase three-winding transformer, a common Sbase is selected for all three windings and voltage bases are selected in proportion to the rated voltage of the windings (a) True (b) FalseThe ratings of a three-phase, three-winding transformer are Primary: Y connected, 66kV,15MVA Secondary: Y connected, 13.2kV,10MVA Tertiary: connected, 2.3kV,5MVA Neglecting resistances and exciting current, the leakage reactances are: XPS=0.09 per unit on a 15-MVA,66-kV base XPT=0.08 per unit on a 15-MVA,66-kV base XST=0.05 per unit on a 10-MVA,13.2-kV base Determine the per-unit reactances of the per-phase equivalent circuit using a base of 15 MVA and 66 kV for the primary.
- The per-unit equivalent circuit of two transformers Ta and Tb connected in parallel, with the same nominal voltage ratio and the same reactan of 0.1 per unit on the same base, is shown in Figure 3.43. Transformer Tb has a voltage-magnitude step-up toward the load of 1.05 times that of Ta (that is, the tap on the secondary winding of Tb is set to 1.05). The load is represented by 0.8+j0.6 per unit at a voltage V2=1.0/0 per unit. Determine the complex power in per unit transmitted to the load through each transformer, comment on how the transformers share the real and reactive powers.A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a balanced load of three 1, Y-connected resistors. Choosing a base of 90MVA,66kV for the high-voltage side of the three-phase transformer. spify 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.The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (a) True (b) False