A strange Transformer ???

[kagliostro]

From an old transistor television I recovered this transformer

220v / 15v

secondary has a section of the wire of 0.035in (0.88mm)

I've seen transformers (PT) with the secondary winding

1) wrapped on the primary

2) wrapped (in a separate neck) near the primary

and OT

3) primary and secondary wrapped alternating each other


this transformer is of the first family but has a big difference

between primary and secondary there are at least 6 mm of free space, only air there (and something that I think is as to control overheat)

Have you never seen something like that ?

which is the reason for that unusual way to wrap windings ?

there are particular advantages to do that ?

If there are advantages why we don't see often this architecture ?

Thanks

Kagliostro

[PRR]

Somebody was REALLY worried about primary to secondary shorts.

Did not want the TV chassis to EVER be directly connected to the wall-power.

If it was 2V-6V it might be for the 20,000 volt end of the CRT or the HV rectifier. But it's too big, 15V is unlikely, and CRT/HV heat was usually a few turns on the horizontal scan transformer.

Unless there is some unusual situation or law, this construction is just expensive.

[Tiny_Daddy]

Maybe it was designed for short periods of high current, with forced air cooling. Not enough voltage for arc welding though.... Auto battery charger?

[kagliostro]

Thanks PRR & Tiny_Daddy

those was a little, "transportable" television but there were no batteries

so

Did not want the TV chassis to EVER be directly connected to the wall-power.

that is the answer

Kagliostro