a) Discus why the transmission systems are mostly overhead systems. b)Discuss why all overhead lines use ACSR conductors. c) Discuss why at 400 kV and above the transmission lines have bundled conductors. d) How do the various devices protect the penstock? e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits. f) At which places the diesel power stations are finding favor? Why? g) How do voids in the insulation cause breakdown of the cable? h) What is the function of condenser in steam power plant?

a) Discus why the transmission systems are mostly overhead systems. b)Discuss why all overhead lines use ACSR conductors. c) Discuss why at 400 kV and above the transmission lines have bundled conductors. d) How do the various devices protect the penstock? e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits. f) At which places the diesel power stations are finding favor? Why? g) How do voids in the insulation cause breakdown of the cable? h) What is the function of condenser in steam power plant?

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

Chapter5: Transmission Lines: Steady-state Operation

Section: Chapter Questions

Problem 5.48P

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Similar questions

a) Discus why the transmission systems are mostly overhead systems. b) Discuss why all overhead lines use ACSR conductors. c) Discuss why at 400 kV and above the transmission lines have bundled conductors. d) How do the various devices protect the penstock? e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits. f) At which places the diesel power stations are finding favor? Why? g) How do voids in the insulation cause breakdown of the cable? h) What is the function of condenser in steam power plant?
A single circuit 60 Hz transmission line. the conductors are Linnet type with flat horizontal spacing of 17.46 feet between conductors. Determine: (a) Assume that the line is short with a length of 50 miles, calculate the parameters of the line and draw the equivalent circuit. (b) Assume that the line is average with length of 150 miles (Pi-nominal model). draw the pi-nominal circuit for the transmission line and calculate its parameters (Z and Y/2 values, where Z is the series impedance of the transmission line and Y is the shunt admittance).
2. A three-phase, three wire, CBA system with an a line voltage of 100 Volt, has three impedances of 5.0 / 30ᴼ inwye connection. Determine the line current, power factor, reactive factor and draw the voltage-current phasordiagram.
In a 380 kV three-phase transmission system, the diameter of the overhead lines in the form of cylinder conductors is 28 mm. a) How much distance should there be between two conductors using the maximum area calculation equations? Calculate. (Puncture peak strength of air is 30kV / cm.) b) In this configuration, if the distance between phase conductors is 4 m, at what voltage level Calculate the discharge occurs? c) Maximum electric field in the same configuration, for electrode distances to be 8 m Calculate the value. If needed in calculations Ꜫ0 = 8.854x10-12 F / m
d) How do the various devices protect the penstock? e) Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits. f) At which places the diesel power stations are finding favor? Why? g) How do voids in the insulation cause breakdown of the cable? h) What is the function of condenser in steam power plant? (please answer all question)
1. What are the applications for stripline and microstrip transmission lines? 2. Give 2 examples of characteristic impedance application for each stripline and microstrip transmission lines.
A three-phase, three wire, CBA system with a line voltage of 120 Volt, has three impedances of 30 /60ᴼ in Deltaconnection. Assume that VCA is the reference vector. Determine the line current and draw the voltage-currentphasor diagram.
The impedance seen from the relay side in a distance relay is 10 ohms. Given that the CT ratio is 1000 : 1 and the PT ratio is 100,000 : 110, determine the actual impedance. Given that the line has a resistance of 1 milliohm per km and a reactance of 20 milliohm per km, find the distance to fault. Assume single-phaseline.
In a three-phase 220 kV, 60 Hz overhead transmission line, the conductors have an overall radius of 1.50 cm each and are arrange in delta foundation. Assuming that the air density factor of 0.90 and Irregularity factor of 0.95. If a critical disruptive voltage of 250 kV between the lines under normal weather conditions. Calculate the minimum spacing between the conductors that is required.
A short 3-phase transmission line connected to a 33kV, 50 Hz generatingstation at the sending end is required to supply a load of 10 MW at 0·8lagging power factor at 30 kV at the receiving end. If the minimumtransmission efficiency is to be limited to 96%, estimate the per phasevalue of resistance and inductance of the line.
In three-phase short transmission line with end-of-line interphase voltage UR = 31,5kV , from the end of the line active power absorbed PR = 9000 kW, end of line power factor is cosφ = 0,70 (end) and the length of the line is l = 20km, The resistance of the line per km is R'= 0,125 Ohm/km, the reactance per km is X'= 0,375 Ohm/km.With the help of given information; a) Calculate the current drawn from the line (IR) as a phasor. b) Calculate the line-to-line-neutral voltage (VS) as a phasor, determine the effective line-to-line voltage (US) Calculate its value. c) Calculate the line head power factor, active and reactive power drawn from the line head, d) Draw the phasor diagram of the system. ..
A single phase transmission line is delivering 470 kVA load at 12 kV. Its resistance is 6 Ω and inductive reactance is 6 Ω if the load power factor is 0.7 lagging. Determine the 1- Current through the line? 2- Sending end voltage? 3- Sending end power factor? 4- Regulation of transmission line? 5-Efficiency of transmission line?