Transmission Lines

A short 3-phase, 3-wire transmission line has an impedance of 3 + j4 ohms per wire. At the receiving end are connected a 3-phase inductive load drawing 3,500 kW at 0.8 power factor and line to line voltage of 13,200-volt and a capacitor bank drawing 150 amperes line current. Calculate the voltage at the sending end.

This is the porcelain insulator for the end poles;

34.5 kV to 69 kV is classified as

A single-circuit three-phase line operated at 60 Hz is arranged in a triangular configuration with distances of 20 ft., 20ft. and 38 ft. between conductors, the conductors are ACSR Drake with GMR of 0.0373 ft. Find the inductive reactance per mile per phase.

The terminal voltage of a Y-connected load consisting of three equal impedances of \(20\angle 30^\circ\ \Omega\) is 4.4 kV line to line. The impedance in each of the three lines connecting the load to a bus at a substation is \(Z_L = 1.4\angle 75^\circ\ \Omega\). Find the line to line voltage at the substation bus.

A 170-mile, 230 kV, 60 Hz, three-phase single-circuit transmission line uses a triangular arrangement with 20 ft, 20 ft and 36 ft spacing, respectively. If the line conductors have a GMR of 0.0217 ft, determine the capacitive susceptance to neutral per mile.

A single phase transmission line has a total impedance of \(5\angle 60^\circ\) ohms and supplies a total load of 120 A at 3.3 kV and 0.8 power factor lagging. Calculate the sending end voltage.

Surge impedance of transmission line is given by

A short 230 kV transmission line has an impedance of \(5\angle 78^\circ\) ohms. The sending end power is 100 MW at 230 kV and 85% power factor. What is the voltage at the other end?

A 3- phase overhead transmission line is being supported by three disc insulators. The potentials across top unit and middle unit are 8 KV and 11 KV, respectively. Calculate the ratio of capacitance between pin and earth to the self- capacitance between pin and earth to the self-capacitance of each unit.

This device function is used to reflect back surgest into the line.

A short 3Φ line with an impedance of 6 + j8 ohms per line has sending and receiving end line voltages of 120 and 110 kV, respectively, for some receiving end load at a p.f. of 0.9 lagging. The active power at the receiving end is nearest to

Each conductor of a horizontally arranged two- conductor bundle line is ACSR, 1,272 MCM Pheasant. The spacing between bundle centers is 8m, 8m and 16m and between bundle conductors is 45 cm. Find the inductive reactance of the line in ohms per km per phase if GMR of each conductor is 0.0466 ft.

Transmission voltage level of 1,000kV is categorized as

Surge impedance of transmission line is given by

A single-phase transmission line has a total resistance of 1.5 Ω and a loop reactance of 0.3 Ω. It delivers 2 MW at 11 kV at a power factor of 0.8 lagging. Calculate the line voltage at the sending end.

Find the capacitive susceptance per mile of single-phase line operating at 60Hz. The conductor is partridge with an outside diameter of 0.642in and spacing is 20ft. between centers.

A three-phase transmission line of a two-conductor bundle is arranged horizontally with a spacing of 8 m between bundle centers. Each conductor is ACSR, 1,272,000 cmils Pheasant with GMR of 0.0466 ft. the spacing between conductors of bundle is 45 cm. Find the per unit series reactance of the line if its length is 160 km and base is 100 MVA, 345 KV.

A string insulator has 5 units. The voltage across the bottom most until is 30% of the total voltage. What is the string efficiency?

The capacitance reactance of a transmission line is 90,000 ohms per kilometer. Find the total capacitance reactance if the transmission line is 50 km long.