Explain the power transmission lines, Electrical Engineering

Assignment Help:

Explain the Power Transmission Lines

Transmission and distribution of electric power is accomplished by using overhead lines or underground cables. Overhead lines are normally used for a.c. transmission systems with high voltage levels (e.g. 132 kV, 400 kV). In densely populated areas where overhead lines are not usually used (for safety or other reasons) underground cables are used. Underground cables are used for relatively short a.c. transmission distances or for d.c. transmission at longer length. This is due to the fact that the conductor of a cable is quite close to the earthed metallic sheath which results in very large shunt capacitance of the cable as compared to that of an overhead line. For a.c. transmission, this gives rise to capacitive current (charging current) which flows in the cable causing I2 R loss and troublesome generation of lagging reactive power. For d.c. transmission, the shunt capacitance charging current ceases when the cable capacitance charges to the applied transmission voltage.


Related Discussions:- Explain the power transmission lines

Sequential circuit, a 4 bit synchronous counter uses flip flops with propag...

a 4 bit synchronous counter uses flip flops with propagation delay times of 15ns each. what will be the maximum possible time requires for change of state?

What is a coprocessor, What is a coprocessor? It is a specially designe...

What is a coprocessor? It is a specially designed microprocessor which take care of mathematical calculations including integer and floating point data .it is intended to work

Magnet, Magnetic materials

Magnetic materials

Electric Circuit, The manufacturer of a 6V dry-cell flashlight battery says...

The manufacturer of a 6V dry-cell flashlight battery says that the battery will deliver 15 mA for 60 continuous hours. During that time the voltage will drop from 6V to 4V. Assume

Explain working of bipolar junction transistors, Q. Explain working of Bipo...

Q. Explain working of Bipolar junction transistors? The family of bipolar junction transistors has two members: the npn BJT and the pnp BJT. Both types contain semiconductor ju

What is the procedure of binary division, Q. What is the procedure of Binar...

Q. What is the procedure of Binary Division? The Binary division is the repeated process of subtraction, just as in decimal division. Signed Numbers Representation If w

Explain generating mode of rotating machines, Q. Explain Generating mode of...

Q. Explain Generating mode of rotating machines? The generating mode has mechanical power input and electric power output. The torque T applied externally to the shaft drives t

Clipper, design a clipper circuit of a sinsoiudial wave of a peak value 25v...

design a clipper circuit of a sinsoiudial wave of a peak value 25v&minimum value of -12v to make the output voltages of 20&-9v respectively.

Delay time - power semiconductor devices , Delay time ( t d ) Initiall...

Delay time ( t d ) Initially a thyristor  remains  in forward  blocking  stat when  anode to cathode forward  voltage  is applied  and gate  to cathode circuit is opened. As t

Matlab code, Linear Equalizer and Decision Feedback Equalizer ...

Linear Equalizer and Decision Feedback Equalizer Simulation and Performance Comparison In this project , performance of decision feedback equalizer is analyzed,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd