The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
Today at 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 7
Who's Online
0 registered (), 198 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#162736 - 04/24/07 05:23 PM 60A 3PH Delta Transformers
Tiger Offline
Member

Registered: 05/04/05
Posts: 714
Loc: 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

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#162737 - 04/24/07 06:16 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
Tiger Offline
Member

Registered: 05/04/05
Posts: 714
Loc: Crystal Lake, IL USA
I'm not receiving PMs correctly, please email me.

Thanks,
Dave

Top
#162738 - 04/24/07 06:57 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
SteveFehr Offline
Member

Registered: 03/19/05
Posts: 1192
Loc: Chesapeake, VA
A lot of us here are familiar with them; what's your question?

Top
#162739 - 04/24/07 08:28 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
LarryC Offline
Member

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
Check out the Theory section on the ECN Electrical Forum.

Top
#162752 - 04/25/07 04:36 AM Re: 60A 3PH Delta Transformers [Re: LarryC]
Tiger Offline
Member

Registered: 05/04/05
Posts: 714
Loc: 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

Top
#162759 - 04/25/07 06:27 AM Re: 60A 3PH Delta Transformers [Re: Tiger]
JBD Offline
Member

Registered: 07/12/01
Posts: 599
Loc: 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?

Top
#162777 - 04/25/07 11:36 AM Re: 60A 3PH Delta Transformers [Re: JBD]
Tiger Offline
Member

Registered: 05/04/05
Posts: 714
Loc: 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


Edited by Tiger (04/25/07 11:39 AM)

Top
#162794 - 04/25/07 03:36 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
LarryC Offline
Member

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
http://www.electrical-contractor.net/For...ber/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

Top
#162799 - 04/25/07 05:30 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
noderaser Offline
Member

Registered: 03/01/07
Posts: 405
Loc: 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.
_________________________
http://www.hsiprodsvcs.com/

Top
#162814 - 04/25/07 06:28 PM Re: 60A 3PH Delta Transformers [Re: Tiger]
JBD Offline
Member

Registered: 07/12/01
Posts: 599
Loc: 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.

Top
Page 1 of 2 1 2 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals