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#205388 - 02/17/12 06:51 PM Great Electrical Power Engineering Forum  
metecakir  Offline
New Member
Joined: Oct 2010
Posts: 1
Turkey
Hello , I am a newcomer and I want to say hello to you , giving you my blog address so that you can enjoy it!

[color:#3333FF]Great Electrical Articles[/color]

Last edited by Trumpy; 02/18/12 12:05 AM. Reason: Fixed up link

Tools for Electricians:

#205392 - 02/18/12 12:08 AM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Hi there and welcome to ECN.
Normally we don't encourage people putting links in here, especially if they are new.
However, seems you aren't actually selling anything and your place is electrically orientated, it's all good. wink


Let's face it, these days if you're not young, you're old - Red Green grin

#205482 - 02/24/12 11:34 PM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
I'd like to find one of those transformers with 4 120V windings, at least 50VA per winding. They don't seem to make that line anymore.


#205486 - 02/25/12 02:29 AM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
pdh...

That WOULD be a weird transformer....

Yet, physics permits it.

Economically, it'd be as valuable as a &^% on a boar hog.

metecakir...

Our own Scott35 already has killer transformer diagrams.

I cannot recommend them too highly.

Cheers.


Tesla

#205492 - 02/26/12 05:29 AM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Tesla,

Thanks for the kind words, per the Transformer drawings!

pdh,

Does the Transformer with (4) 120V Secondaries have a 240V 1 Phase Primary? Kind of sounds familiar... like something from an old Radio set.

-- Scott (EE)


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#205572 - 03/10/12 01:27 AM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
Wire 2 of the 120V windings in series. As long as it has insulation rating to handle the 240V it should be fine.

One use of such a transformer would be to stepping 120V (2 windings in parallel) to 240V center tapped. I'm still looking for one to do this that is integrated with an enclosure where I can put a 6-15R or C13. And I want to keep it small so I can carry it with me.

A very common transformer with 2 120V windings and 2 240V windings (commonly used to step 480 down to 120/240) would not work for me, since my goal is to get a center tapped output (120V or 240V) with a 120V input.


#205573 - 03/10/12 06:11 PM Re: Great Electrical Power Engineering Forum [Re: pdh]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
pdh

What power rating are you looking for? I have some 3.5 KVA medical grade isolation transformers. Dual 0-100-120V primaries with dual 0-120V 15A secondaries.

Datasheet MT3759DS


Last edited by LarryC; 03/10/12 06:15 PM.

#205608 - 03/12/12 10:50 PM Re: Great Electrical Power Engineering Forum [Re: metecakir]  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
I don't need more than 100VA ... light weight so I can carry around with the netbook I power up with it where I need to when the battery runs low. This is so I don't have that 120 Hz vibration feeling on the surface in front of the keyboard around the mousepad due to the fact that the unbalanced power the 120V normally has will be capacitively coupled across the power adapter and raise the voltage level of the DC side by 60 phantom volts relative to ground.

It looks like that catalog does have something I might be able to use, if I can find a suitable enclosure for it to mount a receptacle and either grommet a cord or mount an inlet.

Last edited by pdh; 03/12/12 11:03 PM.


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