Transformer primaries in series, secondaries in parallel -- ok?

[(*steve*)]

In answer to a previous question which basically asked why an arrangement like this was not suitable:



If the load on the top transformer increases, the current through the primary winding wants to increase. In order to do this, the current through the bottom transformer must increase also. This will result in a reduction in voltage across the top transformer's primary and an increase in voltage across the bottom transformer's primary.

The result is that the top transformer's secondary voltage falls, and the bottom transformer's secondary voltage rises.

Edit: the problem does not arise if the transformers share their core (i.e. they are a single transformer)

 

[Tha fios agaibh]

Thanks Steve.
Of course there would be no problem if the primaries were also in parallel.

 

[duke37]

There are transformers made which have identical primary and secondary pairs, these can then be connected in parallel or series as required. Two separate transformers could be near enough, it is easy to measure the differences.

 

[Tha fios agaibh]

As an electrician we parallel separate transformer secondaries all the time provided they are the basically the same.

As Steve explained at the top of this page, circulating currents can become a problem when the PRIMARIES are wired in series.

But with that said;
If the loads are roughly the same on the pair of 300va (I'd consider little) transformers, I'd imagine any circulating currents would be negligible.