Electrical science

[Scifen]

A 400v, 3 phase supply is connected to a heater. Calculate line and phase currents for a 3- phase load having resistive elements of 10 ohms when the elements are connected in
A. Star
B. Delta

 

[radiohead]

Afraid the forum doesn't do your homework. Have a stab yourself, show your working and people will offer guidance.

 

[Lucien Nunes]

Draw the two circuits, mark Vp, Ip, Vl and Il on the drawings. Vl is given. Determine Vp in terms of Vl, hence Ip, hence Il.

 

[SparkyChick]

And I would add... maybe apply to gain access to the trainee only area

 

[DPG]

And maybe a hello, goodbye, thanks etc. rather than just pasting a question in and leaving it at that.

 

[Pete999]

And maybe a hello, goodbye, thanks etc. rather than just pasting a question in and leaving it at that.

Nothing new really

 

[Edtwozeronine]

A 400v, 3 phase supply is connected to a heater. Calculate line and phase currents for a 3- phase load having resistive elements of 10 ohms when the elements are connected in
A. Star
B. Delta

They should have at least given you the formulas, whip out your scientific calculator.

In my college they supplied an electrical science PDF book on Moodle, which takes you through such things step by step.
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this book is very helpful

 

[Scifen]

Why would I thanks you when you have offered me no value Electricians are very emotional beings

 

[telectrix]

Why would I thanks you when you have offered me no value Electricians are very emotional beings

you have had good advice. see posts #2 and #3. no use us doing it for you. if you can't be arsed to make an effort.....

 

[Scifen]

you have had good advice. see posts #2 and #3. no use us doing it for you. if you can't be arsed to make an effort.....

I have thanked them I don't like the fact someone has offered nothing wants me to thank them no one owes anyone anything in life that goes for me aswell but I don't expect it cheers

 

[DPG]

Why would I thanks you when you have offered me no value Electricians are very emotional beings

I think that comment is aimed at me. I'm old fashioned, I think manners and politeness are important.

Have you tried answering the question yet by the way?

 

[Scifen]

I have answered it already I was just asking the forum as I only have formulas for star and not for delta just wanted to know are they worked out the same

VL= 400 VP= 400 square foot 3 =230

IL 230/10 =23 IP =IL =23

DELTA
IP =VP/R = 400/10 = 40A
IL = 40A × square foot 3 = 69.28 A n

Not sure if correct though

 

[James]

star 23A
delta 69.3A (I Line)
delta 40A (I phase)

I agree.

worth noting that I Line and I phase are the same for the star configuration because the sum off currents at the star point is zero.

 

[Scifen]

star 23A
delta 69.3A (I Line)
delta 40A (I phase)

I agree.

worth noting that I Line and I phase are the same for the star configuration because the sum off currents at the star point is zero.

I have an exam this week just wanted to clarify this thanks mate
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I have an exam this week just wanted to clarify this thanks mate

If this was to calculate line and phase voltage with out the 10 ohms
Star
VL =400v
VP = 400 square foot =230

Not sure about delta line and phase voltage

 

[James]

best of luck in your exam.

p.s. don't take what is said above to heart.

we have all been through what you are doing now, most of us before the internet was available in peoples own homes!!

there are many lazy chancers that think the forum will do there homework for them,
the answer is normally similar to the response you got.

any further assistance, if you start by detailing what you know and how you think it should be done, preferably with some sort of, I tried this and got this answer but I am not sure.

there are lots of members that will bend over backwards to help you.
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best of luck in your exam.

p.s. don't take what is said above to heart.

we have all been through what you are doing now, most of us before the internet was available in peoples own homes!!

there are many lazy chancers that think the forum will do there homework for them,
the answer is normally similar to the response you got.

any further assistance, if you start by detailing what you know and how you think it should be done, preferably with some sort of, I tried this and got this answer but I am not sure.

there are lots of members that will bend over backwards to help you.

if you draw it out, you get phase to phase voltage (400v) across each winding in delta.
therefore the line voltage is the same as the phase voltage.

the reason you have higher current is that there are parallel paths for the current to flow.