Transfomer Core size vs Power
Transfomer Core size vs Power
(OP)
Hello questions for the experts,
Is there a realationship between the core size of a transformer (single or three phase ) and its power rating? Please describe.
thx
Is there a realationship between the core size of a transformer (single or three phase ) and its power rating? Please describe.
thx






RE: Transfomer Core size vs Power
RE: Transfomer Core size vs Power
RE: Transfomer Core size vs Power
Higher frequency = smaller core.
Bill
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"Why not the best?"
Jimmy Carter
RE: Transfomer Core size vs Power
So obviously the question is yes, is there an equation that describes the correlation between Ac and Power?
thx
RE: Transfomer Core size vs Power
old field guy
RE: Transfomer Core size vs Power
The TAPs presentation on the IEEE transformer committee website is a very good explanation of the tradeoffs in transformer design, although the site may require a login. http://grouper.ieee.org/groups/transformers/
RE: Transfomer Core size vs Power
The core area is proportional to the volts per turn generated in each winding. And inversely proportional to the frequency. It depends on the B-H curve of the core material as well. The core's length (and therefore its ultimate volume) is primarily determined by the dimensions needed to accommodate the necessary windings. Core length does have an effect on leakage flux and therefore the overall efficiency and impedance of the unit. So if you can keep the core length (and resulting volume) down with better winding designs and insulating materials, you can get better performance out of a 'smaller' core for the same power.
RE: Transfomer Core size vs Power
RE: Transfomer Core size vs Power
Prc, you brought up an interesting point which is very similar to what I found in the link below:
http://en.wikibooks.org/wiki/Electronics/Transform...
At the section "simpler formula" they came to the conclusion that
area =0.17 *sqrt(Power) for 12 K-Guass which is 1.2T at 60Hz.
which is similar to what you described (I am not sure about the F.factor there though).
What's you guys thoughts?
RE: Transfomer Core size vs Power
The price of laminate against the price of copper [or aluminum] states [in a limited measure]the core cross-section.
From an old book [R.Richter vol.III ] we get these:
S=rated power [w]; f=frequency[Hz]; sc=core[column] cross-section [cm^2]
Single Phase Shell-Type sc=C*sqrt(S/f)
Single Phase Core-Type sc=C*sqrt(S/2/f)
Three Phases trf. sc=C*sqrt(S/3/f)
C=4-6 cm^2 for small and medium transformer
C=8 for large transformer.
RE: Transfomer Core size vs Power
In Three Phases trf. sc=C*sqrt(S/3/f)
what is trf? is it trf*SC? or TRF stands for something different?
RE: Transfomer Core size vs Power
"Three Phases trf. sc=C*sqrt(S/3/f)"
has to be:
"on three-phase transformer sc[core cross-section]=C*sqrt(S/3/f)"
where C is the same constant as above it was mentioned.