GE P442 - Calculation of Diff. Phase; Leading Vline Phase; Trailing Vline Phase

P
44x/EN AP/Hb6
Application Notes
(AP) 5
-146 MiCOM P40 Agile
P442, P444
P0494ENa
Trailing V
Li
n
e ph
as
e
x
1
x
2
y
1
VBus
VLine
D
T
y
2
Ta
Leading V
Lin
e phase
x
1
x
2
y
2
VBus
VLine
y
3
Ta
D
T
Figure 105: Calculation of Diff. phase
Phase shift = (∆T/ T) *360
∆T = Ta + (x1-y2)
A phase shift calculation requires a change of sign of both signals.
All the angles will be between 0° and 180°. For a phase shift of 245°,
(360 –245) = 115° will be displayed