Transformer Mystery

[Xelodaki]

Hi!


I got a little problem with my 220/ 18V-2A, 8V-3A, 350V-200mA transformer, ive been trying to find the primary winding
input, but cant just find it!! Ive been trying to find it with my multimeter ohms setting, can't just find it.
Could someone please help me?

 

[Arouse1973]

Does it have any writing on the transformer?

 

[Xelodaki]

Does it have any writing on the transformer?

Thats all, i can't find any datasheet of it

 

[galaxy]

You can see the wires going to the pins. The 18v 2a and 8v 3a will be thicker wires so you can discount them as primary. The other wires will be thin. I'd identify the pairing for these and apply 12 or 24v ac to one and see what the output on the other is. Should be able to figure out which is which.
But are you sore those are the ratings...? I don't know German but that label mentions bigger numbers.

 

[Xelodaki]

You can see the wires going to the pins. The 18v 2a and 8v 3a will be thicker wires so you can discount them as primary. The other wires will be thin. I'd identify the pairing for these and apply 12 or 24v ac to one and see what the output on the other is. Should be able to figure out which is which.
But are you sore those are the ratings...? I don't know German but that label mentions bigger numbers.

The shop where i bought them says those ratings.

 

[davenn]

Hi there
welcome to EP

the end you have the clip on appears to be the primary winding for 220V the 2 outer terminals
the next pair in are not connected the centre pair you can see are linked ( this is for the 110/220V use for splitting the windings

please show a photo of the other ends so we can see the wires going to each terminal

Dave

 

[davenn]

But are you sore those are the ratings...? I don't know German but that label mentions bigger numbers.

yeah that worries me too

it gives the impression that the output voltages are in the 1000's of volts!!!

BE STRONLY WARNED --- this could be dangerous

 

[Xelodaki]

Hi there
welcome to EP

the end you have the clip on appears to be the primary winding for 220V the 2 outer terminals
the next pair in are not connected the centre pair you can see are linked ( this is for the 110/220V use for splitting the windings

please show a photo of the other ends so we can see the wires going to each terminal

Dave

Heres a picture from the other side.

 

[davenn]

OK 8 terminals

from left to right 1 2 3 4 5 6 7 8

1 and 2 are a winding
3 and 4 a winding
5 not connected
6 and 7 a winding
8 not connected

@Harald Kapp is our lad from Germany, maybe he can decipher the wording on the label

Dave

 

[Xelodaki]

Well, thanks to all who cared to help me ill try if it would work.

 

[davenn]

Well, thanks to all who cared to help me ill try if it would work.

I have tagged Harald ... PLEASE wait for his response before powering it up

 

[Xelodaki]

I have tagged Harald ... PLEASE wait for his response before powering it up

Well, ok

 

[davenn]

I don't want to killing yourself

 

[poor mystic]

A signal generator, set to the proper frequency for the transformer under test, can be very useful in safely identifying transformer windings.

PS
I'm pretty sure the high voltages mentioned on the transformer label are the isolation test voltages. The word "gepruft" on the label means a "severe test".

 

[Xelodaki]

Well, i don't have any signal generators

 

[Xelodaki]

I don't want to killing yourself

Thanks for care

 

[duke37]

This could be a very high voltage transformer and could be dangerous as said before.
The primary and secondary appear to be on separate bobbins which would support this.
Measure the resistances between the pins to see which where the windings are connected.
The primary may be in two sections for 110V and 220V, these should be almost identical in resistance. and would be connected in series for 220V and in parallel for 110V.
If the output is low voltage, the resistances will be lower than the primary, if it is very high voltage, then the resistance will be high. An inductance meter could give turns ratio.

Harald will tell what the label says but I think that gepruft means that it has been tested (for insulation) at high voltage.

 

[Xelodaki]

This could be a very high voltage transformer and could be dangerous as said before.
The primary and secondary appear to be on separate bobbins which would support this.
Measure the resistances between the pins to see which where the windings are connected.
The primary may be in two sections for 110V and 220V, these should be almost identical in resistance. and would be connected in series for 220V and in parallel for 110V.
If the output is low voltage, the resistances will be lower than the primary, if it is very high voltage, then the resistance will be high. An inductance meter could give turns ratio.

Harald will tell what the label says but I think that gepruft means that it has been tested (for insulation) at high voltage.

Heres ohms, second isnt 240ohms its 24ohms