ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Do You Travel?
by gfretwell - 05/10/21 06:47 PM
Any Woodworkers here?
by gfretwell - 05/10/21 06:26 PM
Your favourite food?
by gfretwell - 05/10/21 06:13 PM
Lock-down Thread
by gfretwell - 05/10/21 06:12 PM
Just be aware of this...
by Trumpy - 05/10/21 06:47 AM
New in the Gallery:
2020 - 2021 Winter Project
Garden 2021
Who's Online Now
1 registered members (gfretwell), 18 guests, and 20 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
High Leg Delta, phase angles #218564 06/27/17 09:39 AM
Joined: Aug 2008
Posts: 60
A
andey Offline OP
Member
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
Re: High Leg Delta, phase angles [Re: andey] #218565 06/27/17 12:17 PM
Joined: Jul 2004
Posts: 9,610
G
gfretwell Online Content
Member
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

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
RH1
RH1
California
Posts: 22
Joined: August 2009
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 19
Admin 8
Popular Topics(Views)
278,812 Are you busy
211,974 Re: Forum
199,011 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3