The performance of a 220 kV transmission line (TL) is to be studied with regard to power flow analysis. The line may be assumed to be fed from an 'infinite' generator (the Grid) and terminated with a lumped load with fixed real and reactive power. The following system data applies: - System Bases 2000 MVA, 50 Hz, 220 kV Infinite Generator (Grid) 220 kV, 50 Hz, 3-ph, 100,000 MVA Fault level 3-ph & 1-ph, X/R ratio =10, Voltage set at 1.0 p.u. Busbars 220 kV, 50 Hz, 100,000 MVA Fault level, voltage limit is 1 pu ± 8% Transmission Line 220 kV, 3-ph, 50-Hz, R = 0.0082 Ohms/km, L = 0.52 mH/km, C = 0.008 µF/km, with the maximum current Summer/Winter/Spring/Autumn = 780A. I. Calculate, the receiving end current, the sending end (power, voltage and current) using the line models discussed in the lecture notes. The load parameters are as follows; 150 MVA, 0.89 pf lagging, 50 Hz, 220 kV for the following transmission line lengths; a. 22 km (short line) b. 330 km (long line)
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0082 + j(0.52 x 10^-3) + j(0.008 x 10^-6) Z = 0.0082 + j0.52 + j0.008 x 10^-3 Z = 0.0082 + j0.520008 Show more…
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A transmission line that has a resistance per unit length of 4.40 x 10^-4 Ω/m is to be used to transmit 5.00 MW over 400 miles (6.44 x 10^5 m). The output voltage of the generator is 4.50 kV. (a) What is the line loss if a transformer is used to step up the voltage to 570 kV? (b) What fraction of the input power is lost to the line under these circumstances? P_loss / P = (c) What difficulties would be encountered in attempting to transmit the 5.00 MW at the generator voltage of 4.50 kV?
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A 3-phase load of 2000 kVA, 0.8 p.f. is supplied at 6.6 kV, 50 Hz by means of a 33 kV transmission line 20 km long and 33/6.6 kV step-down transformer. The resistance and reactance of each conductor are 0.4 Ω and 0.5 Ω per km respectively. The resistance and reactance of the transformer primary are 7.5 Ω and 13.2 Ω, while those of the secondary are 0.35 Ω and 0.65 Ω respectively. Find the voltage necessary at the sending end of the transmission line when 6.6 kV is maintained at the receiving end. Determine also the sending end power factor and transmission efficiency.
A transmission line that has a resistance per unit length of $4.50 \times 10^{-1} \Omega / \mathrm{m}$ is to be used to transmit 5.00 MW over 400 miles $\left(6.44 \times 10^{5} \mathrm{m}\right)$ The output voltage of the generator is 4.50 kV (rms). (a) What is the line loss if a transformer is used to step up the voltage to 500. kV (rms)? (b) What fraction of the input power is lost to the line under these circumstances? (c) What difficulties would be encountered on attempting to transmit the 5.00 MW at the generator voltage of 4.50 kV (rms)?
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