Question

A power transmission line is used to transmit 150 kW of power at a voltage of 10 kV with a loss of 0.5 kW. If the voltage is increased to 250 kV, what is power loss to transmit the same amount of power?

Answer #1

32-2 Power transmission
Why do power transmission lines use high voltage? An
electric power station sends out a fixed 40 MW of power. The
cross-country power line wires from the power station to the city
has a total resistance of 7 Ω. Assume the circuit consists of the
power station, the line wire (resistor), the city (resistor), and a
storage battery.
Find the power loss (in kW) in the wires using a line
voltage of
a) 500 kV
b) 20...

DC and AC power distribution schemes are illustrated in the
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zPowerGrid Consider an AC power grid with components like the
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used to transmit 5.00 MW over 400 miles (6.44 ✕ 105 m). The output
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A high-voltage transmission line with a resistance of 0.28 Ω/km
carries a current of 1030 A. The line is at a potential of 670 kV
at the power station and carries the current to a city located 155
km from the station.
(a) What is the power loss due to resistance in the line?
MW
(b) What fraction of the transmitted power does this loss
represent?
%

. An Australian power transmission line is designed to deliver
100 MVA at 6.6 kV over a distance of 100 km. The total transmission
line loss is not to exceed 2.5% of the rated line MVA. The
magnitude of the leakage current due to the capacitive effect is
0.291 A. In this transmission system, you need to reduce this
capacitive effect at least by 50%. In this situation, what type of
compensation do you need? At the same time, you...

An Australian (50HZ) power transmission line is designed to
deliver 100 MVA at 6.6 kV over a distance of 100 km. The total
transmission line loss is not to exceed 2.5% of the rated line MVA.
The magnitude of the leakage current due to the capacitive effect
is 0.291 A. In this transmission system, you need to reduce this
capacitive effect at least by 50%. In this situation, what type of
compensation do you need? At the same time, you...

1- A 69-kV, three-phase short transmission
line is 16 km long. The line has a per
phase series impedance of 0.125 +
j0.4375 ohm per km. Determine the sending
end voltage, voltage regulation, the
sending end power, and the transmission
efficiency when the line delivers
a. 70 MVA, 0.8 lagging power factor at 64 kV
b. 120 MW, unity power factor at 64 kV
2-three-phase, completely transposed 345-kV, 200 km
line has two 795,000-
cmil 26/2 ACSR conductor per bundle...

100 MW of electrical power is delivered at 200 kV to a
distribution center over a transmission line which consumes 10% of
the total power developed by the generating station in heat
losses.
a) What is the value of the voltage fed to the transmission line
at the generator end?
b) How much power would be delivered to the same load if the
resistance of the transmission line was halved but the generator
voltage was unaltered?

A generator supplies 5.0 103 kW of power. The output potential
difference is 4500 V before it is stepped up to 510 kV. The
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percentage of the power is lost through transmission of the
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(b) What percentage of the power would be lost through
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A small manufacturing plant is located 2 km down a transmission
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• Determine the voltage and power factor at the sending end of
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• Find the parallel capacitor bank in kVAr that enhance the
power factor to unity. Assume the plant voltage is...

Why is long distance power transmission sent on high
voltage (high tension) wires? Compare two identical
transmission lines delivering the same amount of power: the first
at twice the voltage of the second. Which of the two
lines is most advantageous to a utility
company? Numerically, how much is the
advantage?

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