A transmission-line cable with a length of 5.6 km consists of 18 strands of identical copper conductors, each 1.3 mm in diameter. Because of the twist of the strands, the actual length of each conductor is increased by 5%. Determine the resistance (in Ω) of the cable if the resistivity of copper is 1.72 µΩ · cm at 20°C.

A 60-Hz, three-phase three-wire overhead line has solid cylindrical conductors arranged in the form of an equilateral triangle with 1.4-m conductor spacing. The conductor diameter is 1.8 cm. Calculate the positive-sequence inductance in H/m and the positive-sequence inductive reactance in Ω/km.

Calculate the per-distance series impedance (resistance and reactance in Ω/km) for a three-phase, completely transposed transmission line consisting of one ACSR 900 kcmil conductor per phase, arranged vertically with a phase spacing of 7.1 m. Assume this line is operated on a 60-Hz system at 50°C. (Enter your answer in rectangular form

a + bj

for real component a and imaginary component b. Use any necessary data from this table.)

The conductor configuration of a bundled single-phase overhead transmission line is shown in the figure below.

Line X has its three conductors situated at the corners of an equilateral triangle with 17-cm spacing. Line Y has its three conductors arranged in a horizontal configuration with 17-cm spacing. All conductors are identical, solid-cylindrical conductors, each with a radius of 3.0 cm. Find the equivalent representation in terms of the geometric mean radius of each bundle (in m) and a separation that is the geometric mean distance (in m).

Consider the following figure.

For the overhead line of configuration shown in the figure operating at 60 Hz and a conductor temperature of 70°C, determine the resistance per phase (in Ω/mi), inductive reactance in Ω/mile/phase, and the current-carrying capacity (in A) of the overhead line. Each conductor is ACSR Curlew of this table. (You may use

X_L = 0.2794 log

GMD

GMR

 Ω/mi/phase.

Assume the resistance of each conductor is 0.120 Ω/mi.)

Consider the following figure.

The figure above shows the conductor configuration of a three-phase transmission line and a telephone line supported on the same towers. The power line carries a balanced current of 250 A/phase at 60 Hz, while the telephone line is directly located below phase b. Assume balanced three-phase currents in the power line. Calculate the voltage per kilometer induced in the telephone line. (Enter your answer in polar form with angle in degrees.)

The capacitance per phase of a balanced three-phase overhead line is given by

Consider a three-phase overhead line made up of three phase conductors: Piper, 300 kcmil, and ACSR 30/7. The line configuration is such that the horizontal separation between center of C and that of A is 1.1 m, and between that of A and B is also 1.1 m, in the same line; the vertical separation of A from the line of C–B is 0.40 m. If the line is operated at 60 Hz at a conductor temperature of 75°C, determine the capacitive reactance per phase in Ω · km. (Use any necessary data from this table.)

Three ACSR Mallard conductors are used for a three-phase overhead transmission line operating at 60 Hz. The conductor configuration is in the form of an isosceles triangle with sides of 8, 8, and 13 m. (Use any necessary data from this table.)

A three-phase 60-Hz, 155-km overhead transmission line has flat horizontal spacing with three identical conductors. The conductors have an outside diameter of 3.33 cm with 15 m between adjacent conductors. (Enter your answers to at least three significant figures.)

A 60-Hz, single-phase two-wire overhead line has solid cylindrical copper conductors with a 2.0-cm diameter. The conductors are arranged in a horizontal configuration with 0.9-m spacing and line height of 16 m. Calculate the conductor surface electric field strength in kV_rms/cm when the line is operating at 21 kV. (Assume a perfectly conducting earth plane.)

Calculate the ground-level electric field strength in kV_rms/m directly under one conductor.