S.1) The serial impedance per phase of a three-phase 45 km energy transmission line is 2 + j4 / phase. A load with a power factor of cos2 = 0.8 forward is fed from the end of the line. Since the line voltage at the beginning and end of the line of the energy transmission line is wanted to be kept constant at 115 kV, a) Active and reactive powers drawn from the beginning and end of the line, b) Calculating the power consumed along the energy transmission line and the efficiency of the line
S.1) The serial impedance per phase of a three-phase 45 km energy transmission line is 2 + j4 / phase. A load with a power factor of cos2 = 0.8 forward is fed from the end of the line. Since the line voltage at the beginning and end of the line of the energy transmission line is wanted to be kept constant at 115 kV,
a) Active and reactive powers drawn from the beginning and end of the line,
b) Calculating the power consumed along the energy transmission line and the efficiency of the line.
S.2) Line constants of an energy transmission line are given as A = D = 0.8746 + j0, B = 0 + j128.34, C = j0.0018316 S. At the beginning of the line, it is desired to write 1920 MW active power and 600 MVAr reactive power lines under 7650kV line voltage. According to this business,
a) Calculate the line end magnitudes (U2, I2 and P2).
b) What value does the end voltage take when the load fed from the end of the line is deactivated?
S.3) The length of a phased energy transmission line with a nominal three operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 / km. At the end of the line, a 70 MVA star connected load with a power factor of 0.8 back under 69 kV interphase voltage is fed. The capacitive circuit element of the transmission line with a capacitance of 19.14 F / phase is placed as shunt. According to these given;
a) Line head voltage and current,
b) Active and reactive calculation per line.
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