The efficiency of a 20 kVA 15.4/0.4 kV three-phase power transformer is 76.4% for a unit power factor load at rated power. of the transformer relative short-circuit voltage %Uk = 30.0 and relative no-load current %I0 = 30. Since the transformer is delta-star connected; Question 1. Draw the primary reduced equivalent circuit. Question 2. What is the measured power value in the short circuit test of this transformer? Question 3. What is the value of iron losses of this transformer? Note 1. In 3-phase electrical machines, the current-voltage information given on the label are always line values. Phase value must also be specified when given. Therefore, all current-voltage information given in the question are line values. Note 2. Power transformers operate at maximum efficiency at rated power, maximum efficiency requirement is iron losses and copper losses are equal.

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: (b) A three phase distribution transformer characteristics is shown in Table Q1(b). Referring to…

A: Formula to calculate efficiency of a transformer is: η=n×KVA×cosϕn×KVA×cosϕ+Pi+n2×PCUwhere, n is…

Q: A l-phase, 10-kVA, 500/250-V, 50-Hz transformer has the following constants: Reactance : primary 0.2…

A: In this question,  We need to determine the reading of the instrument for the open circuit test and…

Q: apparent power: 15 kVA, primary:500 V, secondary: 220 V, 50 Hz, idle running current: %7 Idle lost…

A: TRANSFORMER: Transformer is a static device which transfers power from one circuit to another…

Q: A 12-kVA, 240/120-V conventional transformer is to be reconnected as auto-transformer to supply…

A: Connect the auto transformer winding as below

Q: The nominal specifications seen on the nameplate of a single-phase transformer are 600 MVA, 95/500…

A:

Q: With the aid of diagrams/illustrations describe the operation and applications of the following…

A:

Q: 1. The number of devices required to perform the no-load test and the short-circuit test for…

A: Electrical machines can be either generator, transformer or motors. They can be either Ac machines…

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: I need help with solving the question.

A: 7. Transformers are classified based on their construction into two main categories: Core type…

Q: An 100-kVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R₁ = 1.50, X₁ =…

A: Given information is,Rated output  k VA.Induced EMF ratio  Volts.Turns ratio is   .Supply frequency…

Q: A 15 KVA, 2400: 240/120 V, 60 Hz, the two-winding transformer is to be reconnected as a 2400:2520 V…

A:

Q: An 11,000/230-V, 150-kVA, 50-Hz, 1-phase transformer has a core loss of 1.4 kW and full-load Cu loss…

A:

Q: (a) A 5 MVA 230/11.5-kV single-phase power transformer has a per-unit resistance of 1.5% and a…

A:

Q: 3. Why the copper loss in the primary can be neglected, in the open circuit test?

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Q3-(A)- Three single-phase, 50 kVA, 2310/ 230 V, 60 a 3-phase, star /delta, 4000/230V transformer…

A: NOTE- According to the policy, we can answer sub-parts of the first question, kindly post other…

Q: Rated voltage is applied to the low voltage winding of a 60-kVA, 4800/2400-V single-phase…

A: rated voltage is applied to the low voltage winding of a 60KVA, 4800/2400V single phase transformer.…

Q: 3.16 A single-phase, 50-k VA, 2400/240-V, 60-Hz distribution transformer has the following…

A: It is given that:

Q: The values ​​of a phase measured from the no-load (no load) operation and short circuit test of a…

A:

Q: 3. A transformer has resistance and reactance in per unit as 0.01 and 0.04 pu respectively. What…

A: It is given that: R=0.01 puX=0.04 pucosϕ=0.8 pf lagging and leading

Q: Using the apparent power and the terminal voltages as the base quantities in a 44-kVA, 1100/250-V…

A: In this question, we need to determine the base quantities and a turn ratio on as per unit basis.

Q: 1. From first principles, derive the per-phase equivalent circuit of a three-phase transformer…

A: As it is asked only solve subpart (c) so we are solving only that subpart. It is asked to draw the…

Q: A 15 KVA, 2400: 240/120 V, 60 Hz, the two-winding transformer is to be reconnected as a 2400:2520 V…

A:

Q: equivalent winding (a) resistance,(b) reactance and (c) impedance referred to the high voltage side.

A:

Q: draw a three-phase transformer equivalent circuit and also explain how formulas were derived

A: This is a 3 phase transformer equ6 circuit.

Q: A three – phase transformer has rating of 60 MVA, 220 kV (star) – 33 kV (delta) with leakage…

A: The solution is given below

Q: answer

A: According to question: A) The no-load current of a transformer changes when voltage greater than the…

Q: Problem 2. A 150-MVA, 220/22-kV, three-phase has the following parameters (in 2): R2 = 0.001 X, =…

A: In the question,  All parameters are given of transformer.  Determine the equivalent circuit…

Q: We would like to connect a 6 kVA, 120/240 V transformer as an autotransformer to a 120 V source to…

A: As per the guidelines of Bartleby we supposed to answer first three subpart only for solution of…

Q: A 23 KVA, 2300/230 V, 60 Hz step down transformer has the following resistance and leakage reactance…

A: A transformer is an electrical machine which is used in AC circuit to either step up or step down…

Q: A 50 MVA 230/115-kV, A-Y three-phase connected power transformer has a per unit resistance of 0.015…

A: Given rating  of transformer : 50 MVA HV side 230 V   assuming primary side LV side 115 V   assuming…

Q: For an ideal 2-winding transformer, the armpere-turns of the primary winding, N1/1, is equal to the…

A: For the magnetic circuit, the magneto-motive force is given as:

Q: 4-If the transformer is loaded by purely capacitive load, what is the expected regulation and…

A: if the transformer is loaded by purely capacitive load what is the expected regulation and…

Q: (b) A single-phase transformer has 2000 turns on the primary winding and 500 turns on the secondary…

A:

Q: What are the objectives of implementing an open circuit test on single phase transformer

A: In this question we will write objective of open circuit test on single phase transformers...

Q: What are the advantages and disadvantages of back to back test on two similar single phase…

A: Solve for theory

Q: Write the voltage as a function of the transformer turns ratio for the following circuits respecting…

A: This question belongs to electrical machine . It is based on the concept of relation between…

Q: The eddy current and hystresis losses in a 400V, 50HZ, single phase transformer is 500W and 900W…

A: TRANSFORMER: The transformer transfers power from one circuit to another circuit without a change…

Q: A 11000/230 V, 150-kVA, 1-phase, 50-Hz transformer has core loss of 1.4 kW and full load copper loss…

A: The solution is given below

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.