EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Textbook Question
Chapter 28, Problem 10R
Using the method shown in this unit, what is the approximate short-circuit current available at the terminals of a 50-kVA single-phase transformer rated 120/240 volts? The transformer impedance is 1%.
- a. Line-to-line
- b. Line-to-neutral
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Given:A single-phase two-winding transformer is rated 20 kVA, 480/120 volts, and 60 Hz. The equivalent leakage impedance of the transformer referred to the 120-volt winding,denoted winding 2, is ???2 = 0.0525∠78.13°?.Find:Using the transformer ratings as base values, determine the per-unit leakage impedance referred to winding 2 referred to winding 1.
A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-ampere transformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wire delta-connected secondary.For problems 1 through 4 show calculations and/or source of information.
3. What is the proper rating of the fuses to install for overcurrent protection of the secondary?
Chapter 28 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 28 - What is the minimum size service for a one-family...Ch. 28 - Prob. 2RCh. 28 - Prob. 3RCh. 28 - Prob. 4RCh. 28 - Prob. 5RCh. 28 - Prob. 6RCh. 28 - Prob. 7RCh. 28 - List the standard sizes of fuses and circuit...Ch. 28 - Prob. 9RCh. 28 - Using the method shown in this unit, what is the...
Ch. 28 - State four possible combinations of service...Ch. 28 - Which Code section states that all overcurrent...Ch. 28 - All electrical components have some sort of...Ch. 28 - Arc-fault damage is closely related to the value...Ch. 28 - The utility company has provided a letter to the...Ch. 28 - While working on the main panelboard that is...Ch. 28 - Repeat problem 16 for a main service panel that...Ch. 28 - NEC ______________________________ generally...Ch. 28 - Prob. 19RCh. 28 - Prob. 20RCh. 28 - Overcurrent devices must be accessible. (True)...
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- Referring to the transformer connection in Question 9, if the center tap of the primary is connected to a neutral conductor on the incoming power, will it permit the secondary voltages to be balanced when single-phase loads are added?arrow_forwarda. Where is the transformer in the residence mounted? _____ b. To which circuit is the transformer connected? _____arrow_forwardThe no-load and full-load secondary voltages of a transformer were found to be 117 and 113 volts, respectively. Calculate the per cent regulation. Ans.: 3.54%arrow_forward
- 12. If overcurrent protection is provided in the transformer of a separately derived system, which of the following statements is correct?A. A ground electrode must be present at the transformer and the building's disconnect.B. There's no need for service equipment or a panelboard in the separate building.C. An equipment grounding conductor must be run with the conductors between the transformer and the building's disconnect.D. The neutral should be bonded to the equipment grounding conductor at the service equipment in the separate building.arrow_forwardA transformer rated 1-kVA, 240/120, 50 Hz. Because of an emergency, the transformer has to be used on a 60 Hz system. If the flux density in the transformer core is to be kept the same at 50 Hz and 240 volts, what is the volt-ampere rating at 60 Hz?arrow_forwardA single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as astep-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 80 kVA at 0.8 power factor lagging and is at 230 volts. Assuming anideal transformer, calculate the following: (a) primary voltage, (b) load impedance,(c) load impedance referred to the primary, and (d) the real and reactive power supplied to the primary winding.arrow_forward
- What load impedance is connected to the secondary of a single-phase transformer of 8.8 kVA and 2200/220 Volts, the transformer will be fully loaded? (Note: TR is ideal)arrow_forwardWhat's the approximate distance a 480V, 45A, three-phase transformer, wired with 6 AWG copper can be located from the panelboard so the voltage drop doesn't exceed three percentarrow_forward3 single-phase transformers of 2200/220 Volts each will be combined to form a 3-phase transformer. The 3-phase transformer will be fed from a line voltage of 2200 volts and will feed the load with a line voltage of 380 volts. Accordingly, which of the following should be the connection type of this 3-phase transformer? a. star-star b. triangle-star c. Triangle-Triangle D. None e. Star-Trianglearrow_forward
- A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-ampere transformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wire delta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 2. What is the full-load current in the secondary?arrow_forwardA 300-kVA, 460-V, balanced three-phase load is supplied by three single phase transformers connected in Δ/Y to form a three-phase transformer. The primary winding of the three-phase transformer is connected to a 4.8 kV, three-phase transmission line. Determine (a) the rated primary voltage and current, (b) the rated secondary voltage and current, and (c) the power rating of each transformer. -What are the primary and secondary line currents?arrow_forwardA 4.2-kVA, 237 / 164 -volt distribution transformer has the following equivalent resistance and leakage-reactance values referred to the primary: rep = 1.5 ohm; xep = 8.5 ohms. If this transformer is operating at full-load unity power factor, what will be the percent voltage regulation of this transformer?arrow_forward
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