A transformer can have zero voltage regulation at Select one: O a. Leading power factor Ob. Zero power factor OC. Lagging power factor d. Unity power factor
Q: 3. A single phase, 50-Hz transformer has 80 turns on the primary winding and 400 turns on the…
A: According to question: f=50HzT1=80T2=400A=200×10-4m2V1=240V a) The emf induced in the secondary is…
Q: Excitation arm parameters of 1000V/400V single phase transformer with 15kVA power: Xm = 6kΩ an Given…
A: Given ;1000/400 V1-ϕ transformer with a power 15KVA,Xeq=6 K ohm Re=20 Kohm a)Electrical equivalent…
Q: 1. From first principles, derive the per-phase equivalent circuit of a three-phase transformer…
A: In this section are multipart questions. I have done only one part. A transformer is an electrical…
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: If the open circuit voltage is 239V and the full load voltage is 205V, then the percentage…
A: Voltage Regulation is nothing but ratio of drop in voltage from no load to full load to full load…
Q: If the open circuit voltage is 225V and the full load voltage is 200V, then the percentage…
A:
Q: Q14 An ideal transformer is rated at 2700/12O 9.6KVA, and has 5o turns on the seund side. Caleulate…
A: Transformer is static device which work on Faraday's Law of electromagnetic induction. The secondary…
Q: (a) A 220 / 400V, 13KVA, 50Hz single phase transformer has at full load, a copper load of 140W. If…
A:
Q: Explain in detail "phase shift in star delta transform" for positive and negative sequence voltages.…
A: Types of phase sequence in unbalanced system Positive phase sequence Negative phase sequence…
Q: Consider Figure 1 of the text. For an ideal phase-shifting transformer, the impedance is unchanged…
A: Whenever the impedance is seen from the other side of the transformer it is given as:
Q: laggin Hw2.1-3: Derive the following: • The Cu saving for step-up auto transformer with drawing. •…
A:
Q: DHA) a) Draw an equivalent circuit of a current transformer and derive expressions for ratio and…
A: Equivalent circuit of current transformer The equivalent circuit and phasor diagram of current…
Q: Report: 1.Compute the Core losses(no-load loss) of the Transformer. ? 2.Compute the exciting branch…
A: As per the policy , I am attempting the only first question as of my knowledge please ask the second…
Q: Identify, which component of no load current supplies hysteresis loss, in a practical transformer?…
A: In the question choose the correct option? which component of no load current supplies hysteresis…
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: Q1// What is the purpose of conducting experiments (o.c) and (s.c) on asingl- nhase transformer?
A: TRANSFORMER: The transformer transfers power from one circuit to another circuit without a change…
Q: A pure transformer is used to form a step-up autotransformer with common winding of 7200 V and 1400…
A:
Q: A transformer has 3% resistance and 6% reactance drop. The voltage regulation at full-load, 0.8…
A: Given: A transformer at full load has, Resistance drop = 3 % Rpu=3 Reactance…
Q: Draw the on-load phasor diagram of the transformer and mention the parameters.
A:
Q: a. What is Vs? b. Solve for thew load impedence Z_L. c. What is the value of the load impedance when…
A:
Q: 1. The RMS value of induced emf in the primary N1 winding is E1 =; E2 = 2. In ideal transformer on…
A:
Q: A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and…
A:
Q: single-phase transformer has a voltage regulation of 10% when delivering full load at unity power…
A:
Q: A single-phase transformer (assumed to be ideal) with the rated values are given in the figure, is…
A: Two winding transformer rating given S=11KVA Voltage ratings 2200/220V After change in auto…
Q: A single-phase transformer is rated at 30 kVA. The transformer has full-load copper losses of 700 W…
A:
Q: For a conceptual single-phase phase-shifting transformer, the primary voltage leads the secondary…
A: Note: As per our policy, I have attempted the first three subquestions. Given data: E1=E2+308E2=277…
Q: When rated voltage at rated frequency is applied to a single phase transformer the hysteresis and…
A:
Q: (a) Describe the main difference between ideal transformer and practical transformer with help of…
A: In this question need to describe the main difference between ideal transformer and practical…
Q: There is no magnetic core loss in an ideal transformer Select one: O True O False
A: The explanation is as follows.
Q: (i) Illustrate the assumption of an ideal transformer before formulatioi (ii) Formulate Voltage…
A:
Q: if a transformer has a primary rated voltage of 480V and requires 40V to produce the rated current…
A:
Q: PROBLEM A 3300V/440V, single-phase transformer takes a no-load current of 0.8A and the iron loss is…
A:
Q: Write down the construction and working of a two-winding step-up core-type transformer with the help…
A: TRANSFORMER: The transformer transfers power from one circuit to another circuit without a change…
Q: Illustrate the equivalent circuit of this transformer referred to the high voltage side of the…
A:
Q: What are the advantages of Delta connection in high power transformer?
A: Transformer : It is an electrical device used to transform the voltage from one level to another.…
Q: a. The primary of a certain transformer takes 1 A at a power factor of 0.4 when connected across a…
A: (a) Part (i) Consider the transformer is on open-circuit. Draw the circuit diagram of an equivalent…
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: 8. What is a cascaded transformer? Explain why cascading is done? Describe with neat diagram, a…
A: The transformer has a primary and a secondary side. It converts electrical power to electrical power…
Q: A transformer on no-load has a core-loss of 20 W, draws a current of 1 A (rms) and has an induced…
A: According to guidelines we need to solve only the first question. According to the question we have…
Q: 3: Show the effect of the frequency on the following parameters in transformer: (a) Flux density…
A: Need to find the effect of frequency on the following parameter in transformer
Q: A single-phase transformer, working at unity power factor has an efficiency of 90 % at both…
A:
Q: A single - phase transformer has 0.9 power factor and takes a no - load current of 0.8A . Determine…
A: single - phase transformer has power factor cos¢= 0.9and takes a no - load current of Io= 0.8A…
Q: A) Name two types of Transformer equivalent circuit and then compare them.
A: We are authorized to answer one question at a time so answering only 1 please upload other question…
Q: A three-phase Y-Y transformer has specifications of 25 MVA, 15/200 kV and an equivalent series…
A: The solution is given below
Q: A transformer has a reactive drop of 6% and a resistive drop of 2.5%. Determine the lagging power…
A: The voltage regulation is given by the expression as shown below: In terms of the values of the…
Step by step
Solved in 2 steps with 2 images
- 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 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.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) False
- 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.An ideal transformer has no real or reactive power loss. (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.
- In per-unit equivalent circuits of practical three-phase transformers, under balanced thr-phase operation, in which of the following connect ions would a phase-shifting transformer come up? (a) Y-Y (b) Y- (c) -The 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.A 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?
- With the American Standard notation, in either a Y-or-Y transformer, positive- sequen quantities on the high-voltage side shall lead their corresponding quantities on the low-voltage side by 30. (a) True (b) FalseRework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at (a) unity power factor, (b) 0.8 power factor leading. Compare the results with those of Problem 3.14. -A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.