ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,324 Are you busy
174,793 Re: Forum
167,162 Need opinion
Who's Online Now
0 registered members (), 70 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#218564 - 06/27/17 09:39 AM High Leg Delta, phase angles  
andey  Offline
Member
Joined: Aug 2008
Posts: 39
germany
Hi guys,

short question:
As seen from neutral, the phase shift between A and C Phase (low legs) is 180 degrees.
However, the phase shift between A B C for running a 3ph Motor is still 3x 120 degrees? Is that correct?

I am having a hard time understanding that A and C are 180° apart seen from ground, but 120° apart seen from B.

Thanks
Greetings from Germany
Andy

Last edited by andey; 06/27/17 09:40 AM.

Work Gear for Electricians and the Trades

#218565 - 06/27/17 12:17 PM Re: High Leg Delta, phase angles [Re: andey]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
It is easier to think of this as three single phase circuits connected together 120 degrees out of phase. When you look at the diagram with that in mind it is easier to see each pair is a single phase circuit (180 degrees out of phase) but when looked at as a whole you get the 120 degree separation.


Greg Fretwell


Member Spotlight
akmaster
akmaster
alaska
Posts: 70
Joined: June 2012
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.009s Queries: 15 (0.003s) Memory: 0.7442 MB (Peak: 0.8629 MB) Zlib enabled. Server Time: 2017-07-25 10:52:06 UTC