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Electric Power

The series of...

Question

The series of sub-power stations and transformers used in the transmission of electricity can be termed as Transmission lines.

A

True

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B

False

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Solution

The correct option is B False
'Power grid' is the series of sub-power stations and transformers used in the transmission of electricity from the main power station to households. The conducting wires used for this purpose are transmission lines.

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Q. Why are transformers used in the transmission of electric power?

Q. A 400 kV transmission line has a maximum power transfer capacity of P. If the same transmission line is used for 100 kV transmission with series reactance unchanged, the new maximum power transfer capacity will be

Q. Which of the following wire can be used in electrical transmission lines

Q. For the 4-bus system, containing transmission lines and transformers. The admittance matrix is

Y_{b u s} = ⎡ ⎢ ⎢ ⎢ ⎢ ⎣ \begin{matrix} - j 20 & j 20 & 0 & 0 j 20 & - j 60 & j 40 & 0 0 & j 40 & - j 60 & j 20 0 & 0 & j 20 & - j 25 \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎥ ⎦

If a transmission line having

π

-equivalent circuit as shown below is connected between

2^{n d}

4^{t h}

buses. Then the modified

Y_{b u s}

Z_{s e}

= series impedance of transmission line.

Y_{s h} =

shunt admittance of transmission line.

Q. Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5

Ω

per km.The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

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