transformers

[parker3074]

hi
currently doing transformers
and has anyone got a chart/method
working out the turns ratio and current on each side

thanks

 

[spadxiii1918]

you have actually answered your own question. Turns ratio.

Number of turns in Number of turns out Vp/Np = Vs/Ns. You will need to manipulate the equation to meet youe specific requirements.

ie. Ns= Np x Vs
Vp

 

[Notsosmart]

You may find this attachment useful;

 

[IP4X]

Are you doing three phase calculations or just single phase??
Cheers

 

[parker3074]

nice 1
and from a fellow hatter as well
COYH

 

[IP4X]

Single phase is straight forward! Ratios are constant.
Three phase you need to take into consideration the transformer IE:
DELTA : DELTA
DELTA: STAR
STAR : DELTA.......ETC ETC.
Line and phase values differ. Ratios differ.

example:
Delta secondary.....Line value = Phase value.
Star secondary......Line value = phase value x root3.

Thats why I asked.
Cheers

 

[uksel]

aren't they robots in disguise?

 

[IP4X]

Yes!!! Thats why I have tried to explain how they can change so that no one freaks out when it happens!!!
Its all a conspiracy!!!
Cheers

 

[ezzzekiel]

just remember current relationship is opposite, thats how i remember it
np/ns=vp/vs=is/ip