A single-phase 10-kVA 480/120-V transformer is to be used as an autotransformer tying a 600-V distribution...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A single-phase 10-kVA 480/120-V transformer is to be used as an autotransformer tying a 600-V distribution line to a 480-V load. When it is tested as a conventional transformer, the following values are measured on the primary (480-V) side of the transformer: Open-circuit test Voc=480 V Loc=0.41 A Voc= 38 W Short-circuit test Vsc = 10.0 V Isc = 10.6 A Psc = 26 W (a) Find the per-unit equivalent circuit of this transformer when it is connected in the conventional manner. What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? (b) Sketch the transformer connections when it is used as a 600/480-V step-down autotransformer. (c) What is the kilovoltampere rating of this transformer when it is used in the autotransformer connection? (d) Answer the questions in (a) for the autotransformer connection. A single-phase 10-kVA 480/120-V transformer is to be used as an autotransformer tying a 600-V distribution line to a 480-V load. When it is tested as a conventional transformer, the following values are measured on the primary (480-V) side of the transformer: Open-circuit test Voc=480 V Loc=0.41 A Voc= 38 W Short-circuit test Vsc = 10.0 V Isc = 10.6 A Psc = 26 W (a) Find the per-unit equivalent circuit of this transformer when it is connected in the conventional manner. What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions? (b) Sketch the transformer connections when it is used as a 600/480-V step-down autotransformer. (c) What is the kilovoltampere rating of this transformer when it is used in the autotransformer connection? (d) Answer the questions in (a) for the autotransformer connection.
Expert Answer:
Related Book For
Posted Date:
Students also viewed these electrical engineering questions
-
A 120: 480-V, 10-kVA transformer is to be used as an autotransformer to supply a 480-V circuit from a 600-V source. When it is tested as a two-winding transformer at rated load, unity power factor,...
-
A 2000-VA 230/115-V transformer has been tested to determine its equivalent circuit. The results of the tests are shown below. Open-circuit test Voc=230 V loc=0.45 A Poc=30 W Short-circuit test Vsc =...
-
A 5000-VA 480/120-V conventional transformer is to be used to supply power from a 600-V source to a 120-V load. Consider the transformer to be ideal, and assume that all insulation can handle 600 V....
-
Consider a cube that has 5cm length sides. What is the surface area to volume ratio of this cube? Report your answer in cm/cm Report your answer to one decimal place. QUESTION 12 Consider a cube that...
-
Jerk A guitar string vibrates at a frequency of 440 Hz. A point at its center moves in SHM with amplitude of 3.0 mm and a phase angle of zero. (a) Write an equation for the position of the center of...
-
The determinant of a 3 3 matrix A is defined as follows. Evaluate the determinant using the method of diagonals. a12 a13 fA 3 | 21 zz |, then | 2 . a11 a13 a12 a21 a22 |1 2 (2 + 122331 + az12) ...
-
IFRS Framework 2018 states that relevance and faithful representation are the two fundamental qualitative characteristics of financial information. Requirement: (a) Briefly discuss what is meant by...
-
The following accounts appear in the ledger of Celso and Company as of June 30, the end of this fiscal year. Cash ............... $ 15,349 Accounts Receivable .......... 13,810 Merchandise Inventory...
-
K Part 2 of 4 The weights (in pounds) of 6 vehicles and the variability of their braking distances (in feet) when stopping on a dry surface are shown in the table. Can you conclude that there is a...
-
From elementary physics, we know that when an object is subjected to a constant acceleration a, the relationship between distance d and time t is given by d = at2. Suppose that, during a seek, the...
-
16. Solve: (b+6) (6-4)=0 17. Solve: z-9=0 18. Solve: 4b-8b=0 19. Solve: z-13z+30=0
-
As stated by a courier companys dispatch department, the number of delivery errors per million consignments has a standard deviation that is less than 2. Write the claim as a mathematical statement....
-
An automotive manufacturer claims that the standard deviation for the gas mileage of one of the vehicles it manufactures is 5.6 kilometers per liter. Determine whether the claim represents the null...
-
Two forecasts were produced, as shown in Table 9.11. The ME for the second forecast is some seven times larger than the ME for the first forecast. However, the MSE is some 20 times larger. Can you...
-
An internet service provider claims that the mean bandwidth drop time is about 7 minutes. You work for one of the ISPs competitors and want to reject the claim. How would you write the null and...
-
An LED lamp manufacturer guarantees that the mean life of a certain type of LED lamp is at least 25,000 hours. A random sample of 49 LED lamps has a mean life of 24,800 hours. Assume the population...
-
a) George Papas is planning to invest $25,000 today in an investment fund that will provide a return of 8 per cent each year. What will be the value of the investment in 10 years? b) Based on the...
-
The Dow Jones Industrial Average reached a high of $ 7801.63 on December 29, 1997. Recall from Example 18.4 that it reached a high of $ 1003 on November 14, 1972. The Consumer Price Index for...
-
The nameplate on a 50-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV: 78-kV. An open-circuit test is conducted from the low-voltage side, and the corresponding...
-
A two-phase linear permanent-magnet synchronous motor has an air-gap of length 1.0 mm, a wavelength of 12 cm, and a pole width of 4 cm. The rotor is 5 wavelengths in length. The permanent magnets on...
-
The magnetic circuit of figure consists of a core and a moveable plunger of width l p , each of permeability ?. The core has cross-sectional area A and means length A c . The overlap area of the two...
-
Assume your U.S. firm currently exports to Mexico on a monthly basis. The goods are priced in pesos. Once material is received from a source, it is quickly used to produce the product in the United...
-
Using the information in the previous question, consider a proposal to price the exports to Mexico in dollars and to use the U.S. source for material. Would this proposal eliminate the exchange rate...
-
Assume that the dollar is expected to strengthen against the euro over the next several years. Explain how this will affect the consolidated earnings of U.S.-based MNCs with subsidiaries in Europe.
Study smarter with the SolutionInn App