Solutions for Earth Is the Lords
Problem 2.1Q:
Is the turns ratio of a transformer the same as the ratio of voltages across the transformer? Why or...Problem 2.2Q:
Why does the magnetization current impose an upper limit on the voltage applied to a transformer...Problem 2.3Q:
What components compose the excitation current of a transformer? How are they modeled in the...Problem 2.4Q:
What is the leakage flux in a transformer? Why is it modeled in a transformer equivalent circuit as...Problem 2.7Q:
Why does the short-circuit test essentially show only i2R losses and not excitation losses in a...Problem 2.8Q:
Why does the open-circuit test essentially show only excitation losses and not i2R losses?Problem 2.9Q:
How does the per-unit system of measurement eliminate the problem of different voltage levels in a...Problem 2.10Q:
Why can autotransformers handle more power than conventional transformers of the same size?Problem 2.11Q:
What are transformer taps? Why are they used?Problem 2.13Q:
What is a TCUL transformer?Problem 2.14Q:
How can three-phase transformation be accomplished using only two transformers? What types of...Problem 2.16Q:
Can a 60-Hz transformer be operated on a 50-Hz system? What actions are necessary to enable this...Problem 2.17Q:
What happens to a transformer when it is first connected to a power line? Can anything be done to...Problem 2.18Q:
What is a potential transform? How is it used?Problem 2.19Q:
What is a current transformer? How is it used?Problem 2.20Q:
A distribution transformer is rated at 18 kVA, 20,000/480 V, and 60 Hz. Can this transformer safely...Problem 2.2P:
A single-phase power system is shown in Figure P2-1. The power source feeds a 100-kVA, 14/2.4-kV...Problem 2.3P:
Consider a simple power system consisting of an ideal voltage source, an ideal step-up transformer,...Problem 2.4P:
The secondary winding of a real transformer has a terminal voltage of vs(t)=282.8sin377tV. The turns...Problem 2.5P:
When travelers from the USA and Canada visit Europe, they encounter a different power distribution...Problem 2.6P:
A 1000-VA, 230/115-V transformer has been tested to determine its equivalent circuit. The results of...Problem 2.7P:
A 30-kVA, 8000/230-V distribution transformer has an impedance referred to the primary of 20+j100....Problem 2.8P:
A 150-MVA, 15/200-kV, single-phase power transformer has a per-unit resistance of 1.2 percent and a...Problem 2.9P:
A 5000-kVA, 230/13.8-kV, single-phase power transformer has a per-unit resistance of 1 percent and a...Problem 2.10P:
A three-phase transformer bank is to handle 500 kVA and have a 34.5/11-kV voltage ratio. Find the...Problem 2.11P:
A 100-MVA, 230/115-kV, Y three-phase power transformer has a per-unit resistance of 0.015 pu and a...Problem 2.12P:
Three 20-kVA, 24,000/277-V distribution transformers are connected in Y. The open-circuit test was...Problem 2.13P:
A 14,000/480-V, three-phase, Y-connected transformer bank consists of three identical 100-kVA,...Problem 2.14P:
A 13.8-kV, single-phase generator supplies power to a load through a transmission line. The loads...Problem 2.15P:
An autotransformer is used to connect a 12.6-kV distribution line to a 13.8-kV distribution line. It...Problem 2.16P:
Prove the following statement: If a transformer having a series impedance Zeq is connected as an...Problem 2.17P:
A 10-kVA, 480/120-V conventional transformer is to be used to supply power from a 600-V source to a...Problem 2.18P:
A 10-kVA, 480/120-V conventional transformer is to be used to supply power from a 600-V source to a...Problem 2.19P:
Two phases of a 14.4-kV, three-phase distribution line serve a remote rural road (the neutral is...Problem 2.20P:
A 50-kVA, 20,000/480-V, 60-Hz, single-phase distribution transformer is tested with the following...Problem 2.21P:
Prove that the three-phase system of voltages on the secondary of the Y transformer shown in Figure...Problem 2.22P:
Prove that the three-phase system of voltages on the secondary of the Y transformer shown in Figure...Browse All Chapters of This Textbook
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Electric Machinery Fundamentals
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