Explain the importance of transformer and basic insulation level in the distribution system. Justify your answer with real time applications. I
Q: Explain the working principle of a transformer with a neat diagram and derive its EMF equation.
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Q: Derive emf equation for an ideal transformer
A: We will use faraday law to derive EMF equation of ideal transformer.
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: Equivalent circuit diagram and electromotive force phasor for the idle operation of a step-up phase…
A: A transformer is a static device, it consist of two winding interlinked by common magnetic circuit…
Q: If the open circuit voltage is 225V and the full load voltage is 200V, then the percentage…
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Q: 3. On what particular occasion do we need to use autotransformer? Below is given the diagram of a…
A: transformer which has two electrically secluded windings called: the essential and the optional, an…
Q: ii) Derive the expression of EMF induced in a Transformer? Why is a transformer rated in KVA?
A: The basic circuit of the transformer is shown below: In the above circuit: Current losses are…
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) How can you prove that Lsec = Lan (RI/ Rs) for matching impedance with the ideal transformer?
A: We are authorized to answer the only single question at a time since you have not mentioned which…
Q: Using various types of transformers, give 10 impacts to the end-users per type of transformer in…
A: In this solution physical features, advantages and applications of Autotransformer, Power…
Q: If the open circuit voltage is 227V and the full load voltage is 207V, then the percentage…
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Q: 2) With the help of illustration given below, evaluate with a discussion the points mentioned in the…
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Q: Important Note Up to this point, an ideal transformer has been described by a ratio given either as…
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Q: Name two types of Transformer equivalent circuit and then compare them.
A: Since both the question are not interrelated as per the guidelines of Bartley we supposed to answer…
Q: Discuss the relationship between the operating frequency and the transformer size? Through your…
A: Considering the EMF equation of the transformer, E=4.44×f×Bm×N×A Here, E is emf, f is frequency, Bm…
Q: Derive step by step, the electromotive force equation for a single-phase transformer.
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Q: What are the advantages of the star/star connected transformer? And why it is preferred by many…
A: advantages of the star/star connected transformer?
Q: Transformer cooling system in short discussion
A: Transformer A transformer is just a passive electrical device that uses electromagnetic induction…
Q: 1. The RMS value of induced emf in the primary N1 winding is E1 =; E2 = 2. In ideal transformer on…
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Q: Let a 5kVA, 400/200 V transformer be approximately represented by a 2Ω reactance referred to the…
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Q: What is the advantages and disadvantages fot testing transformer?
A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…
Q: transformer (A) having a rating of 2000 KVA is connected in parallel with transformer (B) with 4000…
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Q: Q2 : A) For a single phase transformer, what is the condition of maximum efficiency? B) Draw the…
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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.
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Q: (a) (i) List categories of transformer. (ii) What are the losses that need to be considered when…
A: Transformer used to transfer energy from one device to another and it works on the faraday's law of…
Q: 1. (a) The diagram for a single phase 60 MVA transformer is given below. Convert it to a Step-down…
A: Given 2-winding transformer details are V1/V2=50/100 kV.S=60 MVA The input and output currents of…
Q: Explain the importance of transformer and basic insulation level in the distribution system. Justify…
A: The Basic Insulation Level (BIL) of a transformer is a method of expressing the voltage surge the…
Q: (i) Illustrate the assumption of an ideal transformer before formulatioi (ii) Formulate Voltage…
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Q: 2. What measures are taken for cooling of the transformer? How can you overcome the effect of…
A: No transformer is genuinely an 'ideal transformer' and thus each will cause a few misfortunes, the…
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: The hysteresis and eddy-current losses for a 75-kVA, 480-120 V, 60-Hz transformer are 215 W and I 15…
A: find the explanation below
Q: 1. Why is it not adjustable to carry or the same experiment for large transformers? 2. What method…
A: 1) Large transformers need large supply voltages which is difficult to achieve in an experimental…
Q: During short-circuit test of a transformer, which winding must be short-circuited? Why
A: In this question, We need to explain which winding must be short-circuited during short circuit…
Q: 5-Questions : 1- What are the advantages of Transformer Tests?
A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…
Q: 1. A quantity is expressed in per unit if it is divided by a chosen base quantity having the same…
A: Given, Base power= 10 KW Base Voltage (HV)=2400 V Base voltage (LV)=240 V Base current (LV)=Base…
Q: 1- Why When a transformer is loaded with a constant primary the secondary voltage decreases? 2- What…
A: In this question we will write transformer related problems.... Note :- as per our guideline , I…
Q: ignored in an ideal transformer while considered in a practical 2. Which parameters are transformer…
A: According to guidelines we need to solve only the first question. according to the question we have…
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: 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: What is ideal transformer?
A: The transformer is the device that is used to step up or step down the voltage, and it works on the…
Q: A transformer has two 2, 400-volt primary coils and two 240-volt secondary coils. Indicate by…
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Q: Q1 The oil test condition analysis is the ultimate starting point for any HV transformer assessment.…
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Q: e) What are the specifications for new insulating oils for transformer and switchgears? What are the…
A: The transformer oil has excellent electrical insulating properties and it can stand very high…
Q: During short-circuit test of a transformer, which winding must be short-circuited? Why?
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Q: 5. Write down the equations of a single phase transformer at no-load mode. Give the names of the…
A: Transformer is a static device which is used to step up or down the voltage level or current level.…
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- Consider Figure 3.4. For an ideal phase-shifting transformer, the imda nce is unchanged when it is referred from one side to the other. (a) True (b) FalseIn developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across a transformer, the voltage base is changed in proportion to the transformer voltage ratings. (a) True (b) FalseThree 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.
- 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.The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (a) True (b) FalseA three-phase transformer is rated 1000MVA,220Y/22kV. The Y-equivalent short-circuit impedance, considered equal to the leakage reactance, measured on the low-voltage side is 0.1. Compute the per-unit reactance of the transformer. In a system in which the base on the high-voltage side of the transformer is 100MVA,230kV what value of the per-unit reactance should be used to represent this transformer?
- A single-phase two-winding transformer rated 90MVA,80/120kV is to be connected as an autotransformer rated 80/200kV. Assume that the transformer is ideal. (a) Draw a schematic diagram of the ideal transformer connected as an autotransformer. showing the voltages, currents, and dot notation for polarity. (b) Determine the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of the kA rating is transferred by magnetic induction?Why is it important to reduce the moisture within a transformer to acceptable levels during transformer installation?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.
- For an ideal 2-winding transformer, the ampere-turns of the primary winding, N1I1 is equal to the ampere-turns of the secondary winding, N2I2 (a) True (b) FalseFor 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) FalseConsider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.