Is the Delta current <30 degrees or not?

Click For Summary

Discussion Overview

The discussion centers on the phase relationship between line current and phase current in a delta connection, particularly whether the line current lags the phase current by 30 degrees. It involves concepts related to electrical engineering, specifically in the context of three-phase systems.

Discussion Character

  • Technical explanation

Main Points Raised

  • One participant notes the relationship between line voltage and phase voltage in a WYE connection and questions the phase relationship in a delta connection.
  • Another participant asserts that the line current lags the phase current by 30 degrees.
  • A subsequent reply seeks clarification on whether "lag" implies a negative angle, specifically asking if it means <-30 degrees.
  • A later response confirms that the line current is indeed represented as lagging by <-30 degrees.

Areas of Agreement / Disagreement

There appears to be agreement among participants that the line current lags the phase current by 30 degrees, but the discussion includes a clarification on the interpretation of the phase angle.

Contextual Notes

The discussion does not address potential assumptions regarding the definitions of phase relationships or the implications of using different reference frames.

tim9000
Messages
866
Reaction score
17
The internet is really nebulous sometimes, I was looking and couldn't find the answer. I know that the line voltage is √3*Vphase<30degrees
for a WYE.

and that line current = √3*Iphase
for a delta connection. But is that line current 30 degrees out of phase to the phase current?
As the voltage is in the WYE case.
Thanks
 
Engineering news on Phys.org
Yes, the line current lag by 30 degree to the phase current.
 
nitishsharmabit said:
Yes, the line current lag by 30 degree to the phase current.
Ah, ok thanks.

P.S. actually, since you said lag does that mean <-30 deg?
(negative thirty degrees)
 
Yes that's what I meant.
Line current= sqrt(3)* phase current <-30
 

Similar threads

  • · Replies 20 ·
Replies
20
Views
3K
  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 77 ·
3
Replies
77
Views
9K
Replies
35
Views
6K
Replies
9
Views
2K
  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 10 ·
Replies
10
Views
6K