Zero-sequence filtering for the transformer ends a or b is enabled using the
setting parameters:
●
DIFF: 0-seq. filt.a en.PSx
●
DIFF: 0-seq. filt.b en.PSx
Table 3-1, (p. 3-114) lists the required operations for all vector groups that may
occur. The indices in the equations have the following meanings:
am: amplitude-matched
x: phase A, B or C
x+1: cyclically trailing phase
x-1: cyclically leading phase
End ID of the
vector
group
Setting:
With zero-sequence filtering
Setting:
Without zero-sequence filtering
a
I
am,x,a
− I
am,0,a
I
am,x,a
b 0=12
I
am,x,b
− I
am,0,b
I
am,x,b
1
I
am,x,b
− I
am,x+1,b
⋅
1
3
I
am,x,b
− I
am,x+1,b
⋅
1
3
+ I
am,0,b
2
I
am,0,b
− I
am,x+1,b
I
am,x+1,b
3
I
am,x−1,b
− I
am,x+1,b
⋅
1
3
I
am,x−1,b
− I
am,x+1,b
⋅
1
3
+ I
am,0,b
4
I
am,x−1,b
− I
am,0,b
I
am,x−1,b
5
I
am,x−1,b
− I
am,x,b
⋅
1
3
I
am,x−1,b
− I
am,x,b
⋅
1
3
+ I
am,0,b
6
I
am,0,b
− I
am,x,b
I
am,x,b
7
I
am,x+1,b
− I
am,x,b
⋅
1
3
I
am,x+1,b
− I
am,x,b
⋅
1
3
+ I
am,0,b
8
I
am,x+1,b
− I
am,0,b
I
am,x+1,b
9
I
am,x+1,b
− I
am,x−1,b
⋅
1
3
I
am,x+1,b
− I
am,x−1,b
⋅
1
3
+ I
am,0,b
10
I
am,0,b
− I
am,x−1,b
I
am,x−1,b
11
I
am,x,b
− I
am,x−1,b
⋅
1
3
I
am,x,b
− I
am,x−1,b
⋅
1
3
+ I
am,0,b
Tab. 3-1: Required operations for vector groups with or without zero-sequence current filtering
Vector group matching is via a straight-forward input of the vector group
identification number provided that the phase currents of the high and low
voltage side(s) are connected in standard configuration (see section
Section 3.12.1, (p. 3-62)). For other configurations, special considerations apply
(see Chapter 7, (p. 7-1)). A reverse phase rotation (A-C-B) needs to be taken
into account by making the appropriate setting at the P631. The P631 will then
P631
3 Operation
3-114 P631/EN M/R-11-C // P631-310-650
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