Proper Isolation Transformer Units (PITU)

[salihkanber]

There are 3 Isolation transformers in our lab, one with 1 x 1KVA rating with 2 x 500VA outputs and it stands in a DIY-like case on the floor. Another 2 x 150VA ones was located also in a DIY style in-front and right above our desk like this;



Then I realised that we could design and build Proper Isolation Transformer Units (PITU I call them) for everyone and started this journey by building first 2 for ourselves with the 2 x 150VA's inside;



Here is the image from the first design;



The two will have these specs;

1 x 150VA capacity 220VAC/220VAC isolated Type C output plug with lid
IEC C13 Power Input Plug
ON/OFF Switch with power light
Changeable fuse at the back
Ground connections in front and at the back
Ghost handle
Earthed sheet metal casing with yellow-black color

Any feedback will be appreciated, thanks.

[salihkanber]

Ok here we got some metals, what am I supposed to to with them?!

[Terry Bites]

Er, bolt the transformers inside and screw the covers on??
You want to protect your costly iron parts. Install a fuse holder. A switched and iec inlet . A MOV or two across the input
Put a crimp eye on the earth lead and bolt it onto the steel box with a star washer under it.
Maybe cut a hole to suit a shuko outlet?

What does proper mean?
It will properly kill you just as well ar regular mains outlet.
What leakage currents will you get using thse xfmrs, will that work for your lab scenarios?
For the lab you want a transformer with very high insulation resistance and low interwinding capacitance.
An interwinding shield helps with that and reduces the coupling of common mode noise from input to output.
A split bobbin type is usually a better choice than a layer wound one.

[salihkanber]

Er, bolt the transformers inside and screw the covers on??
You want to protect your costly iron parts. Install a fuse holder. A switched and iec inlet . A MOV or two across the input
Put a crimp eye on the earth lead and bolt it onto the steel box with a star washer under it.
Maybe cut a hole to suit a shuko outlet?

Thank you Terry, All will be installed.

What does proper mean?
It will properly kill you just as well ar regular mains outlet. (Attachment Link)

I couldnt find a proper, an-equipment-for-lab-shaped isolation transformer unit with my requirements, thats why the name. No intention of killing or harming anyone, and please dont let anyone do that on the image, esp with 150VA it wont work too

What leakage currents will you get using thse xfmrs, will that work for your lab scenarios?

Are you mentioning the efficiency loss at this point?

For the lab you want a transformer with very high insulation resistance and low interwinding capacitance.

Could you please explain the effects of low insulation resistance and high interwinding capacitance?

An interwinding shield helps with that and reduces the coupling of common mode noise from input to output. A split bobbin type is usually a better choice than a layer wound one.

Got it 

And please tell me whether you can find that kind of an isolation transformer unit in the market at a good price range? What do you use in your lab?

[salihkanber]

Metals have been painted and installation of the main components has been initiated.

[salihkanber]

Here come the stickers of the front & back panels.. Wait.. What the!..