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#162736 - 04/24/07 08:23 PM 60A 3PH Delta Transformers  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
If anyone is familiar with 3PH transformers and the proper connections please email me. I have more details.

Thanks,
Dave
dave@tigerelectrical.com


Work Gear for Electricians and the Trades

#162737 - 04/24/07 09:16 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I'm not receiving PMs correctly, please email me.

Thanks,
Dave


#162738 - 04/24/07 09:57 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,198
Chesapeake, VA
A lot of us here are familiar with them; what's your question?


#162739 - 04/24/07 11:28 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 781
Winchester, NH, US
Check out the Theory section on the ECN Electrical Forum.


#162752 - 04/25/07 07:36 AM Re: 60A 3PH Delta Transformers [Re: LarryC]  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I broke down and read the instructions that came with the transformers. I was surprised by a few things...that when adjusting voltage slightly you can exceed the nameplate rating of the transformers, the 14 ga primary wires, and the 16/32V secondary.

Thanks,
Dave


#162759 - 04/25/07 09:27 AM Re: 60A 3PH Delta Transformers [Re: Tiger]  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
Originally Posted by Tiger
I broke down and read the instructions that came with the transformers. I was surprised by a few things...that when adjusting voltage slightly you can exceed the nameplate rating of the transformers, the 14 ga primary wires, and the 16/32V secondary.


It sounds like you are working with "buck-boost" transformers (120/240V to 16/32V) that you will be connecting into an open delta arrangement to go between 208 and 236V.

What is your question?


#162777 - 04/25/07 02:36 PM Re: 60A 3PH Delta Transformers [Re: JBD]  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I am working with buck/boost transformers. I guess I was expecting the secondary to be 208V and the wire ga to be 6ga. You're correct...it's connecting to an open delta aiming for 208-220V. My basic questions were answered by the instructions. Understanding how it works is another matter. My one remaining question is...does it matter where the 208V leg is connected, or are they interchangeable?

Thanks,
Dave

Last edited by Tiger; 04/25/07 02:39 PM.

#162794 - 04/25/07 06:36 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 781
Winchester, NH, US
http://www.electrical-contractor.ne...Forum/15/topic/000066/Number/0/site_id/1

The above link is for connecting 2 low voltage secondary buck/boost transformers to change an 3 phase open delta input, to a higher voltage 3 phase output.


Are you trying to convert a center tapped 120/240 with a 208 "wild leg" 3 phase open delta, to a 120/208 wye?

Larry C


#162799 - 04/25/07 08:30 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
noderaser  Offline
Member
Joined: Mar 2007
Posts: 404
Portland, Oregon, United State...
Originally Posted by Tiger
My basic questions were answered by the instructions.


Ok, we're taking away your "American male" status.


#162814 - 04/25/07 09:28 PM Re: 60A 3PH Delta Transformers [Re: Tiger]  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
A buck-boost transformer basically subtracts-adds the secondary voltage from-to the primary voltage. The low voltage is always connected to the H1 and H4 terminals and the high voltage to H1 and X4. The connection of the remaining terminals is dependent on your available-desired voltages.


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