Author Topic: Isolation Transformer  (Read 2867 times)

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Offline VhsfiTopic starter

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Isolation Transformer
« on: November 28, 2012, 02:29:34 pm »
Hi,

I need to buy an isolation transformer as i'm getting some psu and other mains connect stuff to work on,
i came across a good deal on a brand new line conditioner from MGE (now EATON i think) it's a
Pulsar CT12, i know this does more than an Isolation transformer but it does seem to do the same in principle,
plus the line correction, in the manual there is even a section on how to make the unit neutral earthed
or neutral unearthed.
Do you guys think this is ok to use as an isolation transformer?

Here is a link to the user manual:
http://pqlit.eaton.com/ll_download_bylitcode.asp?doc_id=11457

thx in advance
 

Offline jeroen74

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Re: Isolation Transformer
« Reply #1 on: November 28, 2012, 03:00:39 pm »
What's a good deal? Farnell has a range of isolation transformers (search for 'TIM100') that are not too expensive.
 

Offline VhsfiTopic starter

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Re: Isolation Transformer
« Reply #2 on: November 28, 2012, 03:10:48 pm »
A good deal in this case is 20€.
 

Offline ptricks

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Re: Isolation Transformer
« Reply #3 on: November 28, 2012, 03:53:08 pm »
That one looks like it will do the job.

If you happen to have 2 transformers that are the same you can wire the secondaries together to make an isolation transformer. Works pretty well for low current applications , 12.6V  or 24V secondary transformers are what I usually look for as they are fairly common.

 

Offline SeanB

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Re: Isolation Transformer
« Reply #4 on: November 28, 2012, 04:30:16 pm »
I did that to make a 90V supply for a grain moisture meter. I have a lot of 220-12 1W transformers, so wired one to give 12VAC, and wired 2 with the 12V in series and the 220 in parallel to give me 110VAC ( actually with losses more like 90VAC) which was rectified and then dropped to 90V with a high voltage transistor ( MPSA42) and a stacked pair of 47V zeners. the filament supply was made from the 12V supply via a LM317 regulator to give 1V2 for heating ( 60mA filament hearing aid valve). Worked very well, and was cheaper than buying 10 PM3 batteries every 6 months.
 

Online Shock

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Re: Isolation Transformer
« Reply #5 on: December 04, 2012, 06:14:33 pm »
Isn't the Pulsar CT12 an "offline" UPS? 
If so it will just be running on directly connected mains voltages during normal operation, won't it?

Or were you intending to disconnect the mains from the UPS and work on your equipment running under battery power?
An "online" UPS may do isolation (can be more expensive).

I dunno personally it sounds unsafe to me.


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Offline Monkeh

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Re: Isolation Transformer
« Reply #6 on: December 04, 2012, 11:31:08 pm »
Isn't the Pulsar CT12 an "offline" UPS? 
If so it will just be running on directly connected mains voltages during normal operation, won't it?

Or were you intending to disconnect the mains from the UPS and work on your equipment running under battery power?
An "online" UPS may do isolation (can be more expensive).

I dunno personally it sounds unsafe to me.

It's not a UPS, it's a line conditioner. There are no batteries, and the transformer is continually active. Whether it's isolating or not is another question.

As an aside, my UPS (which is neither offline nor online) is isolating.
 


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