transformer winding ratio question

[panfilero]

I have a basic question about transformer ratios, if I have 3
windings, a pri, a sec and an aux, what's the voltage expression for
each winding? My guess is

Vpri = Npri/Nsec

Vsec = Nsec/Npri

Vaux = Naux/Npri

is this right?

thanx!

 

[Chiron]

On Fri, 09 Mar 2012 12:51:52 -0800, panfilero wrote:

I have a basic question about transformer ratios, if I have 3 windings,
a pri, a sec and an aux, what's the voltage expression for each winding?
My guess is

Vpri = Npri/Nsec

Vsec = Nsec/Npri

Vaux = Naux/Npri

is this right?

thanx!

I think you need to consider the voltages as well as the primaries. That
is:

Vsec = Vpri * Nsec/Npri

That sort of thing. I don't think you normally calculate Vpri; I think
it's what you choose (within limits of the transformer, of course). Then
you use Vpri to calculate the other voltages, based on the winding ratios
to Npri.

It seems to me that Vaux would be:

Vaux = Vpri * Naux/Npri



--
Stenderup's Law:
The sooner you fall behind, the more time you will have to catch
up.



--
"Regardless of the legal speed limit, your Buick must be operated at
speeds faster than 85 MPH (140kph)."
-- 1987 Buick Grand National owners manual.

 

[Jasen Betts]

On 2012-03-09, panfilero <panfilero@gmail.com> wrote:

I have a basic question about transformer ratios, if I have 3
windings, a pri, a sec and an aux, what's the voltage expression for
each winding?

V_pri/N_pri = V_sec/N_sec = V_aux/N_aux



--
⚂⚃ 100% natural

--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---

 

[panfilero]

On Mar 9, 3:39 pm, Chiron
<chiron613.no.sp...@no.spam.please.gmail.com> wrote:

On Fri, 09 Mar 2012 12:51:52 -0800, panfilero wrote:
I have a basic question about transformer ratios, if I have 3 windings,
a pri, a sec and an aux, what's the voltage expression for each winding?
 My guess is

Vpri = Npri/Nsec

Vsec = Nsec/Npri

Vaux = Naux/Npri

is this right?

thanx!

I think you need to consider the voltages as well as the primaries.  That
is:

Vsec = Vpri * Nsec/Npri

That sort of thing.  I don't think you normally calculate Vpri; I think
it's what you choose (within limits of the transformer, of course).  Then
you use Vpri to calculate the other voltages, based on the winding ratios
to Npri.

It seems to me that Vaux would be:

Vaux = Vpri * Naux/Npri

--
Stenderup's Law:
        The sooner you fall behind, the more time you will have to catch
up.

--
"Regardless of the legal speed limit, your Buick must be operated at
speeds faster than 85 MPH (140kph)."
                -- 1987 Buick Grand National owners manual.

sorry I forgot to include the voltages, I meant

Vpri = Vsec*Npri/Nsec

Vsec = Vpri*Nsec/Npri

Vaux = Vpri*Naux/Npri

which seems right after reading the responses, thanks