ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's Florida doing with Hurricane Ian?
by Bill Addiss - 09/28/22 12:41 PM
Tough being a lineman's kid
by Bill Addiss - 09/28/22 12:39 PM
GFCI's pops in large numbers
by dsk - 09/26/22 04:35 AM
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 15 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#127072 04/18/01 04:00 AM
Joined: Oct 2000
Posts: 2,722
Scott35 Offline OP
Broom Pusher and
Member
[Linked Image]

T1c = 3 phase Delta pri. to 3 ph 4 wire Wye secondary - shielded transformer.
Note white wires running into coils for shields.

Hello all!
I thought that everyone would enjoy some pictures I shot recently of some special duty transformers [just the cores/coils - no enclosures].

This one is a 200 KVA 3 phase Delta to 3 phase 4 wire Wye - with shielded windings, along with grounded core.

The small white wires run to the shields.

The large white wires on the fronts of the coils are the % voltage taps

More to follow!! - Please post some comments and/or Qs!!!

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Joined: Oct 2000
Posts: 5,392
S
Member
ok,
this is normally seen, much focus on that noodle created.(i won't go there if this was not your intent) [Linked Image]

the voltage is 1.73 what it would be if the secondary was delta....

Joined: Oct 2000
Posts: 2,722
Scott35 Offline OP
Broom Pusher and
Member
Steve,

Ya, this core is similar to the common Delta / Wye stepdown Transformers we all have setup in the field.
The differences in this particular core is the use of "Shielded Windings".
The Shields help to reduce the Capacitive Coupling of EMI / RFI that is something inherent with Isolation Transformers.
The Core is also grounded, which assists with driving those signals to ground levels.

I pointed out the larger white jumper wires on the front center of the coils, to describe where primary %voltage taps are located.
This is because many people are unaware of there location.

As many people are unaware of the primary voltage regulation taps, some are unfamiliar with Transformers all together. Hopefully these pics and the corresponding discussion threads will assist them in gaining some knowledge, or at least some basics, to these devices.


Scott SET


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

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 240
Joined: March 2005
Top Posters(30 Days)
dsk 3
Popular Topics(Views)
297,765 Are you busy
228,511 Re: Forum
213,342 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5