Please explain this transformer from a scientific instrument

[cyphyer]

First post, DIY.

I harvested this heavy transformer from an instrument that we took out of commission.
I live in a 220v country and I want to know if I can use this safely to run 120v tools (like routers etc).

1. It states 2kv. Is this ~2000 or ~4000 watts? (i.e. do I multiply by 120 or 220?).

2. This transformer has a more complicated than usual tag on it. The way the primary and secondary voltages are listed in multiple lines - I do not understand. And What are the T24s?

Bottom line: Can I safely use this to transform 220v to 110v with no modifications - just hook it up and use it?

Cheers!

 

[telectrix]

it would appear so if you configuer the wiring to suit.

 

[cyphyer]

it would appear so if you configuer the wiring to suit.

So the white tag is what's possible and the silver tag from outside the box is the wiring they did? So according to the silver tag, seems this is a 220 to 120 transformer?
(No way I will mess around with the wiring - I just want to use the darn thing)

 

[Spoon]

There is a link to the data sheet for it.
https://www.mouser.co.uk/pdfDocs/ds-st-hpi-series.pdf

 

[UNG]

That transformer is setup as a 230v input / 230v ouput isolation transformer until you reconfigure the output wiring do not connect any 110 / 120v tools to it

 

[cyphyer]

That transformer is setup as a 230v input / 230v ouput isolation transformer until you reconfigure the output wiring do not connect any 110 / 120v tools to it

Ahhh. Got it. Makes sense it was to isolate. Thanks!
Does this mean a qualified person can rewire it? <-- NM, you already said this lol.

 

[cyphyer]

That transformer is setup as a 230v input / 230v ouput isolation transformer until you reconfigure the output wiring do not connect any 110 / 120v tools to it

I think I am getting it.
If theoretically, if one were to remove the bridge circled below in red, would that would turn it into a 230V to 115V transformer? Instead of just a 230 to 230 isolation transformer?


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[Avo Mk8]

Hi Cypher

If you were to remove the bridge wire alone, you won't get anything out.

Simplest would be to remove the bridge as you suggest, and then move the two white wires in the right 0 terminal into the first 0 terminal on the left.

I think you could connect the two 115v windings in parallel if you needed more current - can someone confirm?

or if it's the case that each pair of white/black goes to a separate outlet socket, then put one pair on the left hand winding. And the other pair on the right. That's if you ever want to run two different 115v equipments.

 

[UNG]

I think I am getting it.
If theoretically, if one were to remove the bridge circled below in red, would that would turn it into a 230V to 115V transformer? Instead of just a 230 to 230 isolation transformer?


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View attachment 61419

You need to link the 0's together and the 115's together on the output side to parallel the windings, then your output is taken from one the 0's and one of the 115's

 

[Lucien Nunes]

One think I notice is that the output sockets seem to be Type F which are rated at 10A maximum. This was OK with the transformer in 230-230 mode as its maximum output current was 9A. In 230-115 step-down mode the transformer will deliver 18A so the sockets and typical cables connected to them will no longer be protected against overload. This could occur if adaptors were made to take the plugs of power tools, etc.

 

[Avo Mk8]

One think I notice is that the output sockets seem to be Type F which are rated at 10A maximum. This was OK with the transformer in 230-230 mode as its maximum output current was 9A. In 230-115 step-down mode the transformer will deliver 18A so the sockets and typical cables connected to them will no longer be protected against overload. This could occur if adaptors were made to take the plugs of power tools, etc.

But wiring one secondary winding to one of the two sockets, and the second winding to the second socket, would be OK! ?

 

[Lucien Nunes]

Not really, because then you could overload the winding as well as the socket if you connect all the load to one socket.

 

[Avo Mk8]

Not really, because then you could overload the winding as well as the socket if you connect all the load to one socket.

Fair point - not such a good idea!

 

[Lucien Nunes]

Output fuses or a new socket is where it's at.