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Old 12-19-2016, 11:41 AM   #1
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Default Isolation Transformers/ Auto-Transformers

Hey everybody, I had an interesting discussion about transformers over the weekend. Particularly the difference between Auto-Transformers and Isolation Transformers. I realize Isolation Transformers have no electrical connection between the primary and secondary windings, and are also bigger in size, but what other characteristics make it easy to identify an isolation transformer over an auto-transformer.
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Old 12-19-2016, 01:10 PM   #2
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I'd look at the diagram on the nameplate first. Other info on the nameplate
would also give it away.
Wondering if I missed the point of the question.............
P&L
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Old 12-19-2016, 01:37 PM   #3
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The connection diagram ?
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Old 12-19-2016, 03:17 PM   #4
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Most to Autotransformers are isolation transformers, just the connection is such that the secondary is connected to the primary and is used to boost (increaser) or buck (decrease) voltage typically in small steps. 120 to 24 isolation can be buck or boost depending as noted on the connections made in the field.



Boosting or bucking from 120 to 277 or 208 to 480 would require additional steel and copper or aluminum and therefore is not practical, as there is little to know cost savings,
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Old 12-19-2016, 04:46 PM   #5
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Isolation transformer for surgery that monitor loss to ground or any loss for that matter?
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Old 12-19-2016, 07:23 PM   #6
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with an ohm meter you test for any continuity between promary and secondary windings, with isolation there should be none, but with auto-trasfomer there will be.
in other words auto = no isolation.
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Old 12-19-2016, 10:26 PM   #7
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Quote:
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Isolation transformer for surgery that monitor loss to ground or any loss for that matter?
While you are correct the question is broader than just an ungrounded isolation transformer used in operating rooms.
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Old 12-19-2016, 10:27 PM   #8
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Quote:
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with an ohm meter you test for any continuity between promary and secondary windings, with isolation there should be none, but with auto-trasfomer there will be.
in other words auto = no isolation.
Yes but I can take an isolation and make it a Auto transformer. .
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Old 12-20-2016, 06:00 PM   #9
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Quote:
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While you are correct the question is broader than just an ungrounded isolation transformer used in operating rooms.
Was just wondering where his question was derived from. Kinda wondering why so vague.just thought I would put out one of its benefits used in the field.
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Old 12-21-2016, 04:31 AM   #10
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Not sure if i got this right , but i recall that an isolation transformer has a physical mechanical barrier between primary and secondary...??

Frank
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Old 12-21-2016, 03:37 PM   #11
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Quote:
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Not sure if i got this right , but i recall that an isolation transformer has a physical mechanical barrier between primary and secondary...??

Frank
That would be a "high isolation" transformer. Typically including a grounded electrostatic shield between the windings. Minimizes capacitive coupling between windings but does nothing do anything for magnetic coupling (Duh!)
To get rid of differential mode noise you would have to add tuned filtering.

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