Q3: An overhead transmission line conductor at river having two un same level towers, the height of towers of 45 m, 80 m respectively and 'o' point out towers. If the maximum un vertical sag is 40 m and the tension in wires is 3000 N/cm2, the wind pressure is 100N/m .If the weight of one meter of conductor is 8 N and cross sectional area is 8cm2 .Find the spam between towers.

Q3: An overhead transmission line conductor at river having two un same level towers, the height of towers of 45 m, 80 m respectively and 'o' point out towers. If the maximum un vertical sag is 40 m and the tension in wires is 3000 N/cm2, the wind pressure is 100N/m .If the weight of one meter of conductor is 8 N and cross sectional area is 8cm2 .Find the spam between towers.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.1P: The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at 20C...

See similar textbooks

Similar questions

A solid cylindrical aluminum conductor 25 km long has an area of 336,400 circular mils. Obtain the conductor resistance at 20C and 50C. Find the AC resistance per Km of the cable at 50C. Assume a skin-effect correction factor of 1.02 at 50 Hz. The resistivity of aluminum at 20C is 2.8x10-8 Ωm
A portion of an overhead conductor is taken to be s metres long. The tension in the conductor is T Newton metres. The unit weight of the conductor is given as W Newton per metre. The line tension, T has a horizontal component of To and a vertical component of Wx. S makes an angle, α with the horizontal plane. Derive a equation for s in terms of T
Q4. A Transmission Line has a span of 250 meters between two level supports. The conductor has a cross-sectional area of 1.29 cm2, weighs 1170 kg/km and has a breaking stress of 4218 kg/cm2. Calculate the sag for a safety factor of (5), allowing a wind pressure of 122 kg per square meter of projected area. What is the vertical sag?
An overhead line has span of 260m. The tension in the line is 1200kg while the conductor weighs 650 kg per 100 meters. Calculate the maximum SAG in the conductor. If the height of the tower is 13 meters, estimate the clearance of conductor to the ground. Draw a figure and mark values of sag, clearance, span, height of conductor etc.
The three conductors of a 3-φ line are arranged at the corners of a right angled isosceles triangle. If each equal side of this triangle is 2 m, find line-to neutral capacitance per km. Take the diameter of each conductor as 1·24 cm. The conductors are transposed at regular intervals. [0·0094 μF/km]
The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft (or 0.05112 ohm per km) at 20 degree celcius and a 60 Hz resistance of 0.0956 ohm per mile (or 0.0594 ohm per km) at 50 degree celcius for the all-aluminum Marogold conductor, which has 61 strands and whose size is 564 mm2 or 1113 kcmil. Assuming an increase in resistance at 50 degree celcius, and determine the percentage due to skin effect.
An overhead line is supported between two towers which are at the same vertical height from the ground. The horizontal distance between the towers is 300m. If the conductor weight is 30N/m and the tension at the towers is 30kN, calculate i. the maximum conductor sag. ii. Find also the total length of the conductor.
4. Give the reasons: (a) The AC resistance of a conductor is more than the DC resistance. (b) The resistance of a standard conductor is higher than the resistance of the solid conductor (c) The transposition of the overhead transmission line. (d) A charging current is existing in a line even when line is open circuited at the load end.
A 415 single core cable has a conductor diameter of 0.5 cm and a sheath of inside diameter 3 cm. In cable insulation, find: (i) minimum stress (in V/cm); (ii) maximum stress in (V/cm); (iii) Describe where these minimum and maximum stress will occur in cable insulation?; (iv) Suggest what should be the minimum dielectric strength (in V/mm) of the cable insulation to avoid any breakdown of the given cable
Q3. What will happen if the conductor in black wire and green-yellow wire touches each other? What will you do to solve this problem?
Q1. Transmission and distribution lines are important components of any power system study. (A) In relation to high voltage overhead ac transmission lines, Discuss the choice of materials for the conductors in terms of their electrical/mechanical properties and the costs involved. Discuss the factors that determine the distance (D) between phase conductors and explain the impact of the distance D on the inductance and capacitance values of the line at different voltage levels. Support your arguments with relevant equations where appropriate. Discuss the impact of the radius of the conductors on phase capacitance and inductance values and why bundles are used at very high voltages.
(b) A 3-phase, 50 Hz, 132 kV overhead line of length 150 km has conductors placed in ahorizontal plane. The diameter of the conductors is 20 mm and assume completetransposition arrangement is applied. (i) Analyse the charging current per phase when the conductors spacing are set at 4 m (ii) Investigate the range of conductor spacing that should be chosen in order to reducethe magnitude of the charging current per phase in Q2 (b)(i) by 5% or more.