EE - Transmission & Distribution

A 13.8 kV distribution line has a Thevenin’s equivalent impedance 2.63%. If a phase-to-phase fault occurs between phase B and C, determine the fault current at 10 MVA base.

A three phase short transmission line having per phase impedance of 2 + j4 ohms has an equal line to line receiving end and sending end voltages of 155 kV, while supplying a load of 0.8 pf leading. Find the power supplied by the line?

What is the self geometric mean distance of a 3-strand bundle made of ACSR Rail conductors with 45 cm between conductors? The GMR of ACSR rail is 0.0386 ft.

A single-phase transmission line has an impedance of (2 + j5) Ω supplies a load of 50 kW at unity pf. Find the voltage at the receiving end if the sending end voltage is 2400 volts.

A power station supplies 60 kW to a load over 2500 ft of 000 2 conductor copper feeder the resistance of which is 0.078 ohm per 1000 ft. The bus bar voltage is maintained constant at 600 volts. Determine the maximum power which can be transmitted.

A three phase 60 HZ line has a flat horizontal spacing. The conductors have an outside diameter of 3.28 cm with 12 m between conductors. Determine the capacitive reactance of the line to neutral if its length is 125 miles.

A three-phase 60 HZ, 30 mile transmission line delivers 20,000 KW at 69,000 volts and 75% power factor lagging. The resistance of the line is 0.3 ohm per mile and the reactance is 0.7 ohm per mile. What is the transmission line efficiency?

A conductor consists of seven identical strands each having a radius of r. What is the factor by which r should be multiplied to find the self GMD of the conductor?

Find the inductance per km of a three-phase overhead transmission line using 3cm diameter conductors when these are placed at the corners of an equilateral triangles of sides 4 meters.

A single circuit 745 KV 60 HZ three-phase transposed transmission line is composed of four ACSR 1,272,000 cmils, 54/19 Pheasant conductors per phase with horizontal configuration. The phase spacing between the center of the bundles is 14m and the bundle conductor is 14 cm. The conductors have a diameter of 1.382 inch and a GMR of 0.5592 inch. Determine the capacitance per phase per km of the transmission line in microfarad per kilometer.

A single-phase, 10 km transmission line has 16.65 mH total inductance. If the distance between the inductor is 1.0 m, what is the conductor radius?

A 69 KV, 3-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 + 0.4375 ohm per km. Determine the transmission efficiency when the line delivers 70 MVA, 0.80 lagging power factor at 64 kV.

A three phase 115 KV, 60 HZ, transmission line has a per phase series impedance of Z = 0.05 + j0.45 ohm/km and a per phase shunt admittance of Y = j3.4 x 10^-6 siemens/km. The line is 120 km long. Using the normal pi line model, determine the transmission line D constant.

A 155 KV, 60 HZ three-phase subtransmission line is 45 km in length. The resistance per phase is 0.2148 ohm/mile and the inductive reactance is 0.441 ohm/mile. Calculate the subtransmission line efficiency when the line is supplying a three-phase load of 220 MVA at a lagging power factor of 80% at 115 kV using short line model.

A load of 10 MVA, 0.8 p.f. lagging, 22-KV is served by a transmission line which has a line resistance of 3 ohms and a line reactance of 10 ohms. Solve for the sending end voltage.