Transformer - Real and Symbolic

[Sling]

Recently I was using a transformer in a lab experiment at university and it seemed very different to it's schematic symbol in set-up. Each coil seemed to be split in half ...?

If anyone who knows about transformers could give a quick explanation of why this is so I'd be very grateful !

 

[Guest123]

Hi.

The symbol on the right is of an iron core transformer as opposed air core etc cant quite make out the picture on the right.

The primary and secondary coils of a transformer aren't joined the voltage is "passed" between the two by a magnetic field with a small amount of the primary current used as "excite" current to excite the coil of the primary side and induce the EMF.

Even with no load on the secondary side of the transformer the "excite" current will still be present on the primary.


Is this what you meant???

 

[Sling]

I already understand the basic principle of how a transformer works.

If you look at the photograph, it isn't as simple as just 'primary and secondary coils' though. Each coil is split into half for some reason. So there are 4 coils on the face of the transformer unit!

 

[Guest123]

The only beast I've ever come accross with 4 coils is a "bridge transformer" where the two coils are further split in two to enable the use of a four wire system.

 

[thepurple1]

I already understand the basic principle of how a transformer works.

If you look at the photograph, it isn't as simple as just 'primary and secondary coils' though. Each coil is split into half for some reason. So there are 4 coils on the face of the transformer unit!

The windings are" halved" to allow different input voltages on the primary side e.g 220,230,240,250 and different output voltages on the secondary side12/24v

 

[Sling]

The windings are" halved" to allow different input voltages on the primary side e.g 220,230,240,250 and different output voltages on the secondary side12/24v

How are the two 'limbs' connected - across the coils in parallel, or along them in series?