A three phase 60HZ, 60kV transmission line consisting of 3 conductors are placed at the corners of a triangle of sides 10, 15, and 13 meters. The radius of each line conductor is 2 cm. The length of the transmission line is 120 km. Assume ɛ=8.854x 10-12. Determine
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- 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?A 132 kV, three-phase, 50Hz transmission line uses 18 mm diameter, equally spaced conductors. Determine the spacing between these conductors, if it is to be designed such that the corona inception voltage is 5% higher than the normal operating voltage of the line at 40oC. (You may assume the expression relating the electric field and the voltage of the line as a starting point, m=0.9)A 55 -km long, 50 Hz, single-phase, 2-wire, transmission line is composed of 26 -mm diameter solid conductors. If the separation between conductors is 2.8 m., What is the inductance per conductor per unit length in (mH/km)?
- .A 3-phase, 220 k 50Hz transmission line consists of 1.5 cm radius conductor spaced 2 metres apart in equilateral triangular formation. If the temperature is 40°C and atmospheric pressure is 76 cm, calculate the corona loss per km of the line. Take m = 0.85A Three-Phase, 180 KV, 75 Hz Transmission Line consists of 1.2 cm radius conductors spaced at 2.4 meters apart in an equilateral triangular formation. If the Temperature is 40 ºC and Atmospheric Pressure is 76 cm of Hg, calculate the Corona Loss per km of the line. Take m0=0.8A 132 kV, three-phase, 50Hz transmission line uses 18 mm diameter, equally spaced ACSR conductors. Determine the spacing between these conductors, if it is to be designed such that the corona inception voltage is 5% higher than the normal operating voltage of the line at 40o C. You may assume the expression relating the electric field and the voltage of the line as a starting point.
- A 15-km, 60Hz, single phase transmission line consists of two solid conductors, eachhaving a diameter of 0.8cm. If the distance between conductors is 1.25m, determine theinductance and reactance of the lineA 50 -km long, 30 Hz, single-phase, 2-wire, transmission line is composed of 49 -mm diameter solid conductors. If the inductance per conductor of the line is 1.011 in mH/km, what is the separation distance between conductors in meter?Estimate the corona loss for a 3-phase, 110 kV, 50 Hz, 150-km-long transmission line consisting of three conductors, each of 10 mm diameter and spaced 2.5 m apart in an equilateral triangle formation. The temperature of the air is 30oC and the atmospheric pressure is 750 mm of mercury. Take the irregularity factor as 0.85. Ionisation of the air may be assumed to take place at a max voltage gradient of 30 kV/cm.
- 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.HIGH VOLTAGE . A 132 kV, three-phase, 50Hz transmission line uses 18 mm diameter, equally spaced ACSR conductors. Determine the spacing between these conductors, if it is to be designed such that the corona inception voltage is 5% higher than the normal operating voltage of the line at 40o You may assume the expression relating the electric field and the voltage of the line as a starting point.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.