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

Circuit realization of the srff, Q. You are to construct a modified truth t...

Q. You are to construct a modified truth table for the circuit realization of the SRFF shown in Figure. As indicated in the text, you guess an output and then go back ato check it

Draw a diagram of ultrasonic machine, Draw a diagram of ultrasonic Machine ...

Draw a diagram of ultrasonic Machine and illustrate its important parts? Discuss the following important element of ultrasonic process. (i) Abrasive slurry. (ii) Work Mate

What do you mean by superposition and linearity, Q. What do you mean by Sup...

Q. What do you mean by Superposition and linearity? Mathematically a function is said to be linear if it satisfies two properties: homogeneity (proportionality or scaling) and

Explain different routing plan adopted in a network, Q. Explain different R...

Q. Explain different Routing plan adopted in a Telephone network.  Ans: Hierarchical networks are capable of handling heavy traffic where required, and at the same time us

Electric roadway system specification, The electric roadway system shall ut...

The electric roadway system shall utilize solar energy as the main power source. The electric roadway system shall negotiate with the power utility on backup power supply.

Give the classification of oscillators, Q. Give the classification of Oscil...

Q. Give the classification of Oscillators?  Depending on the type of the output waveform, oscillators are classified as sinusoidal (or harmonic) oscillators and relaxation osci

Electrical/electronic engineering project, i need a project creating in ele...

i need a project creating in electronic/electrical engineering at HNC level, 3000 words Harvard referencing. it can be about anything in this field or i can give a suggestion

What do you mean by continuous signals, Q. What do you mean by Continuous s...

Q. What do you mean by Continuous signals? Continuous signals are described by time functionswhich are defined for all values of t (a continuous variable). Commercial broadcast

Realization of digital filter design, why we are going to realization of di...

why we are going to realization of digital filter after finding the H(z).

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