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

Diode characteristic, Q. For the circuit shown in Figure(a), determine the ...

Q. For the circuit shown in Figure(a), determine the diode current and voltage and the power delivered by the voltage source. The diode characteristic is given in Figure.

The maximum power transfer theorem, The maximum power transfer theorem stat...

The maximum power transfer theorem states: 'A load will receive maximum power from a linear bilateral dc network when its total resistive value equal to the Thevenin's or Norto

Determine the maximum electric field in the depletion region, An abrupt sil...

An abrupt silicon (n i = 10 10 cm -3 ) p-n junction consists of a p-type region containing 10 16 cm -3 acceptors and an n-type region containing 5 x 10 16 cm -3 donors. a)

Programming, ELEC 132 COURSEWORK – ADC This work will be assessed based...

ELEC 132 COURSEWORK – ADC This work will be assessed based on program demonstration (during lab sessions) and design. You will also have to submit your c-source codes as word o

Derive the equations of the self bias circuit, Q. Derive the equations of t...

Q. Derive the equations of the self bias circuit? A circuit which is used to establish a stable operating point is the self biasing configuration. The circuit is shown in Fig

What is cd-rom, Compact Disc - Read Only Memory. A CD-ROM is any compact di...

Compact Disc - Read Only Memory. A CD-ROM is any compact disc which having computer data. These discs can store enormous amounts of data (up to 640 megabytes). If there is a large

Cipper, when i/p voltg is grater than battery diode is clse or open

when i/p voltg is grater than battery diode is clse or open

Find the minimum load resistor, Q. Consider the non inverting amplifier. Le...

Q. Consider the non inverting amplifier. Let R i = 1k and R f = 2k. Let the op amp be ideal, except that its output cannot exceed ±12 V at a current of ±10 mA. (a) Find the

Decision making, Decision  Making The rhombus diamond symbol  is used...

Decision  Making The rhombus diamond symbol  is used to represent  the decision making  process  as shown  below.                                          Figure  De

Metals, Metals, Semiconductors, and Insulators For electrons...

Metals, Semiconductors, and Insulators For electrons to move within an applied electric field there have to be states available to them. A totally filled band ca

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