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6 F 2 S 0 8 5 7
(b) Settings for typical connections of 3-windings transformer
Settings for phase angle correction
Transformer connections described in
IEC60076-1
Primary , Secondary,
Tertiary
(P) (S) (T)
Primary, Secondary, PA Diff., Tertiary, PA Diff.
(yd_p) (yd_s) (vec_s) (yd_t) (vec_t)
Remarks
Phase angle matching
calculation (Table
2.2.5.1)
Yy0d1
1 1 0 2 1
P: 0 O’clock
S: 0 O’clock
T: 1 O’clock
Yy0d11
1 1 0 2 11
P: 0 O’clock
S: 0 O’clock
T: 11 O’clock
Yd1d1
1 2 1 2 1
P: 0 O’clock
S: 1 O’clock
T: 1 O’clock
Yd11d11
1 2 11 2 11
P: 0 O’clock
S: 11 O’clock
T: 11 O’clock
Dy11d0
2 1 11 2 0
P: 1 O’clock
S: 0 O’clock
T: 1 O’clock
Dy1d0
2 1 1 2 0
P: 11 O’clock
S: 0 O’clock
T: 11 O’clock
Dd0d0
2 2 0 2 0
P: 1 O’clock
S: 1 O’clock
T: 1 O’clock
Yy0y0
1 1 0 1 0
P: 0 O’clock
S: 0 O’clock
T: 0 O’clock
Note: Dotted line: Reference phase
<How to set phase angle matching for GRT100>
Reference phase for phase angle matching
The phase of a star-connected winding side is used as the reference phase for phase angle
matching.
Yd: primary
Dy: secondary
Yy: primary
Dd: the reference vector leads the A phase of the primary side by 30°.
Phase rotation
The relationship between each terminal current vector of a transformer, which depends on the
transformer connection and the connection between the transformer and the power system, must
be checked. The phase displacement of a delta-connected side may not be determined only by the
transformer connection described in IEC60076. Table 2.2.5.3 shows an example illustrating the
connection of a transformer and power system and their current vectors when a Yd1 type
transformer is connected to the power system with both clockwise and anticlockwise phase
rotation. In this case, the setting for phase angle correction is not corresponding to that of Table
2.2.5.1.