transformer

I'm unaware of any "basic calculation." The end result is dependant upon whether it's a step- down, or, step- up transformer. In either of these two there is a direct correlation in the turns ratio primary:secondary, and the input: output voltage. i.e: If you apply 120 volts a/c to the primary of a 10:1 step- down xfmr you'll end up with 12 volts a/c on the secondary. opposite is true of step- up xfmr's 12 volts @ the primary of a 1:10 would result in 120 volts @ the secondary. If a larger step-up is required then it usuallyrequires two xfmr's wired buck-boost. (buck phase- boost voltage this is a three phase application )

Please refer to any transformer design book. The no of turns will depend on the voltage and other parameters.

Number of turns are computed for the inductance value optimum for operating frequency. Primary voltage is also taken into account.

tpv = pow(10, 8) / (4.44 * bmax * secarea * freq);
primt = (primv * tpv);
secndt = (secndv * tpv);

It depends up on the Supply Voltage and The Required Volage.Ratio of these Two Volatges is the Turns Ratio of The Trasnformer. Caluclation of Remaining Parameters Depends on Turns Ratio.

The voltage induced in the secondary is determined by the TURNS RATIO.

Primary voltage Number of primary turns
-------------------------------- = ------------------------------------------------

Secondary voltage Number of secondary turns

for mare information just tell me wat voltage retio and power do u want to give in input and wat to get in output.

i will tell u no of turns and the gage of wire and no. of care

Dear Sir,

I am electrical engineer in the field of transformer but I am interested in the Designing of Transformer so can you suggest me the basic fundamental of transformer

100 KVA, 11000/433 V ,50Hz., ONAN,

I can design and I reffered the BHEL book

It will depend ona number of factors. All transformer materials, have a different level at which they reach saturation, so the material will affect the number. The frequency you operate at will also affect the result. So will the shape of the wafeform, frequency of operation, and topology (Lineary, Flyback, etc.) as well as mode of operation (continuous mode -CM or discontinuous mode - DCM).

If you are needing a standard 50/60HZ transformer to isolate or change voltage levels, you will use an equation that sets a lower limit of your turns based on the highest possible voltage encountered. If, on the other hand, you are using a SMPS - Switch Mode Power Supply operating at 50-500Khz you will then design a primary based on energy storage, which is directly related to the inductance. The core material, however, has to be kept from saturating by inserting a precise air gap between the magnetic core halves.

If you let me know what kind of transformer you are looking at building, I have tons of information I can either send you links to or send you. The main question being, what frequency (determines material), how much power (determines size and core material choices), and the application (which can affect a myriad of minor factors which optimize your end result).

I have been designing magnetics for more years than I can count. I love it, but it is not as simple as things may seem, but just about everything, no matter how complex can be broken down into vary basic blocks which can abe easily understood.

The basic equation for determining the Primary # of turns in a low frequency (aka <10 KHz linear power transformer is:

Np=(Ea(Vac)*10^8)/(Kf (4.0 for SineWave) * Bm(Max material flux density in gauss)*Ac(cm^2)*Frequency (Hz))

This is just to give you an idea of how a transformer is designed for LOW frequency, continuous mode Linea operation. Switchmode power is completely diifferent.

Flanagans book "Handbook of Transformer Design and Applications" might be a good place to start.

Wikipedia also has a good primer here:

http://en.wikipedia.org/wiki/Transformer

hello..

i m doing my engineering and as a training project i have been given a project on smps transformer design.

i shall b thankful to you if you can give some outlines as how to proceed and what all factors to be kept in mind while designing.