Answer / guguloth shobhan

every signal has hormonics that are 1st,2nd,3rd,4th,5th..so on.even hormonics will be zero for sinusoidal signal becoz of it is odd function.So reamining are 1st,3rd,5th,7th,.....but higher order are not much effected that are 7th,9th...so on. SO remaining are 1st,3rd,5th.
5th order hormonic wiil be zero due to symmetrical(120 displacement).now have to eliminate 3rd hormonic ,it will be eliminate by using 3phase supply.1st hormonics is fundamental hormonic that is desirable one.
for above reason , we are using 3 phase supply.

Answer / mahesh

it needs many slip rings, converters,cross arm long increased,cost incrsd,,,,,etc

Answer / sanjayjssate

The power generates due to change of flux passing through armature, in 3 phase system the displaced flux at equal angle gives max output without hindering other flux path. That is why 3 phase generation is in practice. It is also very economical.

Answer / sandy

electrical degree is considered for generate the electrical phase there are 360 electrical, so we can generate only 3 phase 120 degree electrical per phase.
 

Answer / rakesh

We need min 3 ac phases to produce an alternately rotating , self-starting, magnetic field which is basic need to produce EMF and hence generation of power. And for 360 total electrical degree ,there we have 3 , 120 apart degree electrical phase. so no 2 phase production popular, now same may be achived by 4phase 5 phase system , but it needs as many slip rings,coil's, insulation to produce as well as converters,cross arm long increased to convert and transmit

why making capacity is more than breaking capacity?

14 Answers   Essar, Indo Asian, Infinity,

what is the string efficiency

1 Answers  

In a power system we know that if the generated power is less than the load then the frequency of the system is decreases.So does this mean that total required load is delivered at alower frequency?

1 Answers  

different between electrical and electronics Engineering????

4 Answers  

Sir,I have finished my B.E in the Stream of EEE.How Can I get C license for Electrical???Please Tell me the way...My mail ID is praba1003105@gmail.com Cell:7402474123

1 Answers  

When calculation of fault current and fault Kva is to be done,why always we use per unit value and why we consider the base kva?

0 Answers  

What is the function of the exiter in DG.

3 Answers  

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

0 Answers  

single phase voltage 230 and Three phase voltage 450 why 690 voltage

1 Answers   XYZ,

How wire size can define in electrical wiring? What is the ratio?

0 Answers   Descon,

if a 2 ohm resistor,2 ohm capacitor and a 2 ohm inductor is connected parallely to 12v source.Then what is the value of current in each branch.Is current flows in each branch at the same time?If not so then provide the proper sequence

1 Answers   Tata Steel Limited,

what is the use of vcb & isolator in substation?

4 Answers