Three phase ac circuit, Electrical Engineering

Assignment Help:

Three Phase AC Circuit:

Alternating circuits thus far discussed have single phase supply system and it's satisfactory for domestic application as light, fan and heating, etc. But for industrial applications and big size electrical devices, etc. 1-phase system has several limitations. Therefore, poly phase system (2-phase, 3-phase and 6-phase systems) is utilized in electrical engineering. However for transmission, generation and distribution and utilisation of electrical power a 3-phase system has been universally adopted. 2 and 6-phase are derived from the 3-phase system, if needed.

A set of three single phase sinusoidal voltage currents of same magnitude and frequency but have a progressive phase difference of 120o or 2π /3 radians electrical constitutes balanced 3-phase voltage/current.

 

356_Three Phase AC Circuit.jpg

Figure illustrates that 3-phase voltage and their instantaneous values are given by,

Vaa′ = Vm sin ω

Vbb′ = Vm sin (ω - 120o)

= V m    sin ( ωt -( 2π/3) )

Vcc′ = Vm sin (ω - 240o)

= V m sin (ωt - (4π/3))

For a common n-phase system displacement among phases is given by (360o (electrical)/ n) so for 2-phase system it is 90o electrical.


Related Discussions:- Three phase ac circuit

Orthogonal frequency division multiplexing, CURRENTLY, orthogonal frequency...

CURRENTLY, orthogonal frequency division multiplexing (OFDM) is emerging as the preferred modulation technique in modern high data rate broadband wireless mobile communication syst

Cycloconverter scherbius drive - motor control , Cycloconverter  Scherbius...

Cycloconverter  Scherbius Drive In this  drive  instead of dual controlled used in link  scherbius  drive one  phase  controlled  line commutated cyclconverter is used. This

What do you mean by exponent, Q. What do you mean by Exponent? The expo...

Q. What do you mean by Exponent? The exponent field needs to represent both negative and positive exponents. To perform this, a bias is added to the actual exponent in order

Set up a table for a 4-to-10 line excess-3 decoding, Q. (a) Excess-3 cod...

Q. (a) Excess-3 code is a 4-bit binary code for the 10 decimal digits and is found useful in digital computer arithmetic. Each combination is found by adding 3 to the decimal nu

Bjt, how do I find the ic and ve

how do I find the ic and ve

Give a block diagram for amodulo-5 binary ripple counter, Q. Give a block d...

Q. Give a block diagram for amodulo-5 binary ripple counter using JKFFs and draw its timing diagram.

Determine downink of a cdma system, Consider the point-to-point radio link ...

Consider the point-to-point radio link introduced in problem 9. By how much must transmit power be increased to maintain the maximum BER of 10-5 if the channel is flat Rayleigh-fad

Residential wiring and safety considerations, Q. Residential wiring and saf...

Q. Residential wiring and safety considerations? Residential electric power service commonly consists of a three-wire ac system supplied by the local power company. A distribut

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