Isolation xfrm

[mstrlucky74]

Have someone telling me a particular xfrmr is an isolation type but I'm not convinced. Is there a way to tell if it's a regular k rated etc. or isolation type? Thanks

 

[infinity]

What's the application? Is the ratio 1:1?

 

[Smart $]

Your typical step-up/step-down power transformers are isolation transformers but the term isolation isn't tossed around much until you get to specific applications requiring isolation. FWIW a separately derived system transformer is indirectly required to be an isolation type transformer.

 

[cdslotz]

All xfmers are isolation by definition. When someone uses that term, they are usually implying a 1 to 1 ratio like 208v to 120/208 to establish a new sep derived system and electrode for the purpose of isolated 220% neutrals....and those are typically K rated

 

[zbang]

All xfmers are isolation by definition.

Well... excluding auto-transformers and those with an internal bond between windings, but I can only recall seeing that in utility distribution transformers. Otherwise, they all isolate; the only question is the degree of isolation.

 

[mstrlucky74]

What's the application? Is the ratio 1:1?

Yes, step up then down.

 

[Cascode3]

Yes, step up then down.

Two transformers then if you want to change the ratio twice?
Can you describe the application?