110V power tool transformer

[builder]

I shipped a container from USA with power tools and got a transformer from Scotland today the transformer burned out what can I do is there any way to find a replacement


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[Crossy]

Do you need a site type centre-tapped (55V-0-55V) isolating transformer (like the dead one) or a regular 220V-110V appliance transformer which doesn't provide the additional safety but will run the tools just fine?

 

It's worth checking that it's not just an internal fuse that's popped.

[RichCor]

The dealeo regarding 55v-0v-55v CTE (or variations thereof), for those playing along at home:

 

https://www.gstransformers.com/technical/110v-centre-tap-earth-55v-0v-55v.html

 

 

EDIT/ADD:  Also, any equipment connected to a CTE derived power source should be controlled by ON/OFF switches or breakers that interrupt both legs of the power source.

 

The OP will also need to verify that the equipment being used doesn't do anything 'stupid' with how the "Earth Ground" and "Neutral" are wired or utilized.

Edited October 6, 2017 by RichCor

[builder]

I have put into a shop need to rewind coil cost approximately 3 or 4000 baht not much choice. Can you tell me U.K. Site tools are 110 v 50 hertz USA 110v 60 hertz will this have an effect on the transformer


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[sappersrest]

I fear your transformer may be to small to run your saw. those small transformers were designed really for operating power drills etc.

All your questions are answered here.

https://www.diynot.com/diy/threads/sizing-portable-transformer-for-operating-us-110v-tools.404672/

[Damrongsak]

Your 120V, 60 Hz USA tool motors won't be too happy running at 110V, 50 Hz.  Those with a universal type motor might not care much.

Edited October 7, 2017 by Damrongsak

[Crossy]

Most power tools have "universal" motors which don't really care about frequency, they will even run on DC.

 

Motors designed for 60Hz can get away with slightly less iron in the core and may go in to saturation on 50Hz, but at the slightly reduced operating voltage it's unlikely to be a real issue.

 

What I do see is a 600VA (say 500W) transformer, if that mitre saw is being run from it there's no real surprise it died, my 9" mitre saw is 1,500W!

 

If you're not going on site (in the damp) than a 2,000W power converter (auto-transformer) will drive everything with no reduction in safety over using 220V tools. Get it from your local electrical emporium.

[builder]

I have it back now cost as much to repair as it would to replace. The chop saw is 9 amp motor compressor is 10 amp rest of tools are sanders etc


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[Crossy]

1 hour ago, builder said:

I have it back now cost as much to repair as it would to replace. The chop saw is 9 amp motor compressor is 10 amp rest of tools are sanders etc

Looking more closely at the transformer it states 1.2kVA intermittent, so it would (just) run the saw OR the compressor.

 

It does seem odd that it has no overload protection and went so far as to require a re-wind

 

 

[builder]

There is a trip that has tripped once before the weird thing is I plugged it in and it made a loud buzzing noise with no tool


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