The span of the same level transmission line is 300 m. The diameter of the conductor is 15 mm. Wind pressure intensity over the projected area is 45 kg/m²? If the density of the conductor material is 8900 kg/dm, find the sag. Also calculate the vertical sag. The ultimate tensile stress of the conductor is 5000 kg/cm²? Assume a factor

The span of the same level transmission line is 300 m. The diameter of the conductor is 15 mm. Wind pressure intensity over the projected area is 45 kg/m²? If the density of the conductor material is 8900 kg/dm, find the sag. Also calculate the vertical sag. The ultimate tensile stress of the conductor is 5000 kg/cm²? Assume a factor

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 4.7P: If the per-phase line loss in a 70-km-long transmission line is not to exceed 65 kW while it is...

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If the per-phase line loss in a 70-km-long transmission line is not to exceed 65 kW while it is delivering 100 A per phase, compute the required conductor diameter if the resistivity of the conductor material is 1.72108-m.
A single-phase overhead transmission line consists of two solid aluminum conductors having a radius of 3 cm with a spacing 3.5 m between centers. (a) Determine the total line inductance in mH/m. (b) Given the operating frequency to be 60 Hz, find the total inductive reactance of the line in /km and in/mi. (c) If the spacing is doubled to 7 m, how does the reactance change?
The geometric mean radius of the conductor in a 380 kV, 120 km long transmission line 24mm. The roughness factor of the conductor is 0,98. Geometric mean length between phases of conductors 3,2 m. Air pressure across the line 725 mmHg, temperature 18 degrees Celcius and the conductor surface temperature is 85 degrees Celsius.According to this,a) Calculate the voltage at which ionization starts and the corona voltage.b) Find the corona loss for operating voltage with Peek formula.c) Calculate the total corona loss of the line with the Peek formula for a 15% increase in operating voltage.
A very low-loss microstrip transmission line has the following per unit length parameters: R = 2 Ω/m, L = 80 nH/m, C = 200 pF/m, and G = 1 µS/m. (a) What is the characteristic impedance of the line if loss is ignored? (b) What is the attenuation constant due to conductor loss? (c) What is the attenuation constant due to dielectric loss?
Geometric mean radius of a 400 kV, 300 km long three-phase transmission line 20 mm. The roughness factor of the conductor is 0.82 and the geometric mean interphase length is 10 m. The air pressure along the line is 760 mm Hg and the temperature is 23 °C. In this transmission line; a)- Calculate the voltage at which ionization starts due to impact and the corona voltage. b)- Find the total corona loss in the three-phase system for the operating voltage with the Peek formula. c)- Find the total corona loss for the 10% increase in the operating voltage.
A lossless coaxial cable transmission line has L = 200 uH/ft and C = 100 nF/ft. The inner diameter of the outer conductor is 3cm and the diameter of the inner conductor is 1cm. What is the dielectric constant of the insulator?
A lossless coaxial cable transmission line has L = 200 uH/ft and C = 100 nF/ft. The inner diameter of the outer conductor is 3 cm and the diameter of the inner conductor is 1 cm. What is the dielectric constant of the insulator?
Geometric mean radius of a 3-phase transmission line of 422 kV, 220 km length 22 mm dir. The roughness factor of the conductor is 0.82 and the geometric mean length between phases is 11 m. Air pressure along the line is 720 mm Hg and the temperature is 22 ° C. In this transmission line; a) - Calculate the corona voltage and the voltage at which ionization begins with impingement particles. b) - Find the total corona loss in the three phase system for the operating voltage with the Peek formula c) - Find the total corona loss for 1% increase in operating voltage.
1. A transmission line conductor is supported from two towers at heights of 70 m above water level. The horizontal distance between the towers is 300 m. If the tension in the conductors is 1500 kg, find the clearance at a point mid-way between the towers. The size of the conductor is 0·9 cm2 and density of conductor material is 8·9 gm/cm3.
A 3 phase 140 kV line with 43.715 cm of distance separation between the conductor so that corona takes place if the line voltage exceeds 250 kV (r.m.s.). If the value of potential gradient at which ionization occurs can be taken as 30 kV (max) per cm, and if the temperature is 40°C and atmospheric pressure is 76 cm, find the radius of the conductor.
Geometric mean radius of a 400 kV, 200 km three-phase transmission line 20 mm dir. The roughness factor of the conductor is 0.8 and the geometric mean length between phases is 11 m. Air pressure along the line is 700 mm Hg and the temperature is 20 ° C. In this transmission line; a) - Calculate the corona voltage and the voltage at which ionization begins with impingement particles. b) - Find the total corona loss in the three phase system for the operating voltage with the Peek formula. c) - Find the total corona loss for 10% increase in operating voltage.
3. A transmission line has a span of 150 m between level supports. The cross-sectional area of the conductor is 1·25 cm2 and weighs 100 kg per 100 m. The breaking stress is 4220 kg/cm2. Calculate the factor of safety if the sag of the line is 3·5 m. Assume a maximum wind pressure of 100 kg per sq. metre. [4]