G. Ziegler. Digital Differential Protection
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PTD PA13 N. M Tests 7UT 05/03 No. 6
Definitions in SIPROTEC 4 Relays
How to see the vector group Yd11?
Original
Siprotec4 (Browser)
Phase angles
Side 1: 0°
(reference phase)
Side 2: 210°
Please subtract 180°,
than you get 30°
(360°-30°= 330°)
Vector definition to a node is positive
The shown vectors or phase angles are transformed in
this positive definition
The phase angle is displayed mathematics positive.
The reference phase is always phase L1 on side 1
PTD PA13 N. M Tests 7UT 05/03 No. 7
Web Tool (Browser) Vector group YNd11
PTD PA13 N. M Tests 7UT 05/03 No. 8
Vector Group Determination via Fault Record
IL1;Side 1
IL1;Side 2 lags 150°or leads 210° Star point is towards the protected object
Way 1:
IL1 Side: 150°+ 180°= 330°
Way 2:
IL1 Side: 210°-180°= 30°
leads 30°or lags 330°
Phase shift is according the vector group definition 330°→ 11 * 30°
G. Ziegler, 10/2005 page1
Differential Protection Symposium
Belo HorizonteNovember 2005
Digital Transformer Differential
Protection
I0-correction
+ vector group adaptation
G. Ziegler, 10/2005 page2
Differential Protection Symposium
Belo HorizonteNovember 2005
L1
L2
L3
Yd5
1
3
3
∆
∆
∆
3
3
1
2
3
3
3
1
1:3
2
L1
L2
L3
L1
L3
L2
Transformer differential protection with I0-correction
External fault
I0-correction
Vector group adaptation
G. Ziegler, 10/2005 page3
Differential Protection Symposium
Belo HorizonteNovember 2005
L1
L2
L3
Yd5
1
3
3
∆
∆
∆
3
1
3
3
3
1
1:3
2
L1
L2
L3
L1
L3
L2
1
I0-correction
Vector group adaptation
Transformer differential protection with I0-correction
Internal fault
Power Transmission and Distribution
Differential Protection (7UT)
Determination of the Transformer Vector Group
PTD PA13 N. M Tests 7UT 05/03 No. 2
Transformer with Vector Group Yy0
7UT612
20 kV
110 kV
2500A/1A
500A/1A
80 MVA
Yy0
PTD PA13 N. M Tests 7UT 05/03 No. 3
Side 2: Side 1:
1L1
1L2
1L3
2L1
2L2
2L3
I
L1,S1
I
L1,S2
= I
L1
Vector group is
Y y 0
0°
Method of Vector Group Determination (ExampleYy0)
U
L1,S2
U
L3,S2
U
L2,S2
U
L1,S1
U
L2,S1
U
L3,S1
I
L1,S1
I
L1,S2
PTD PA13 N. M Tests 7UT 05/03 No. 4
Transformer Protection
7UT612
20 kV
110 kV
2500A/1A
500A/1A
80 MVA
Yd11