ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 4
Recent Posts
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
Bathroom electrical
by gfretwell. 08/14/17 02:05 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Housebilding DIY wiring
Popular Topics(Views)
239,859 Are you busy
175,419 Re: Forum
167,707 Need opinion
Who's Online Now
0 registered members (), 39 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#129783 - 08/19/05 03:39 PM Balancing loads  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
480x208/120Y Transformer

How can the primary be close to being balanced, but the secondarys be way out of whack?

I measured a different trans today and found the readings, primary balanced close, but not secondarys of the wye.


Shouldn't the primary windings be unbalanced just as much as the secondarys?


Anyone got an explanation?


Dnk.....


Tools for Electricians:

#129784 - 08/19/05 10:34 PM Re: Balancing loads  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
Since there is no bolted primary to secondary phase connections, the balance on the primary may not match the secondary exactly, but they should be close considering the turns ratio. 2.3x for your transformer


Ron

#129785 - 08/21/05 04:15 PM Re: Balancing loads  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
480x208/120 XFMRS is 4:1 not 2.3

The 480 Volt delta windings are wrapped around each 120 Volt wye leg.

4/1.73205 = 2.3 The implied ratio for 208 Volts.


Tesla

#129786 - 08/25/05 09:24 PM Re: Balancing loads  
Larry Fine  Offline
Member
Joined: Feb 2005
Posts: 693
Richmond, VA
Dnk, you've discovered why high-voltage transmission lines are basically floating delta systems - I've heard an engineer call it "self-balancing".


Larry Fine
Fine Electric Co.
fineelectricco.com

#129787 - 08/26/05 06:57 AM Re: Balancing loads  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
Larry, can you elaborate on the "floating Delta"?

I assume by your post, the readings I am getting may be normal then?

Dnk.....



Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7676 MB (Peak: 0.9040 MB) Zlib enabled. Server Time: 2017-08-16 23:45:22 UTC