GE Multilin
T60 Transformer Protection System
9-9
9 COMMISSIONING
9.2 DIFFERENTIAL CHARACTERISTIC TEST EXAMPLES
9
9.2.3 TEST EXAMPLE 2
D/YG30° TRANSFORMER WITH PHASE A TO GROUND FAULT ON THE GROUNDED WYE.
Transformer: D/y30°, 20 MVA, 115/12.47 kv, CT1 (200:1), CT2 (1000:1)
Figure 9–3: CURRENT DISTRIBUTION ON A D/YG30° TRANSFORMER WITH A LV-SIDE GROUND FAULT
TEST
PHASE
INJECTED CURRENT
DISPLAYED CURRENT
STATUS
W1 CURRENT
W2 CURRENT
DIFFERENTIAL
RESTRAINT
Balanced
Condition
A
0.29
∠
0°
0.926
∠
–180°
0
∠
0°
0.5349
∠
–180°
Not Applicable
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.29
∠
–180°
0
∠
0°
0
∠
0°
0.5349
∠
0°
Minimum
Pickup
A
0.137
∠
0°
0.521
∠
–180°
0.048
∠
0°
0.3
∠
–180°
Block
I
d
= 0.048 < Min PKP
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.137
∠
–180°
0
∠
0°
0.048
∠
0°
0.3
∠
0°
Minimum
Pickup
A
0.108
∠
0°
0.521
∠
–180°
0.102
∠
0°
0.3
∠
–180°
Operate
I
d
= 0.102 > Min PKP
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.108
∠
–180°
0
∠
0°
0.102
∠
0°
0.3
∠
0°
Slope 1
A
0.4435
∠
0°
1.6
∠
–180°
0.110
∠
0°
0.9026
∠
–180°
Block
I
d
/
I
r
= 11.9%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.4435
∠
–180°
0
∠
0°
0
∠
0°
0
∠
0°
Slope 1
A
0.4425
∠
0°
1.7
∠
–180°
0.165
∠
0°
0.979
∠
–180°
Operate
I
d
/
I
r
= 16.8%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.4425
∠
–180°
0
∠
0°
0.165
∠
0°
0.979
∠
0°
Intermediate
Slope 1 & 2
A
1.2
∠
0°
5
∠
–180°
0.675
∠
–180°
2.882
∠
–180°
Block
I
d
/
I
r
= 23.4%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
1.2
∠
–180°
0
∠
0°
0.675
∠
0°
2.882
∠
0°
Intermediate
Slope 1 & 2
A
1.1
∠
0°
5
∠
–180°
0.860
∠
–180°
2.882
∠
–180°
Operate
I
d
/
I
r
= 29.8%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
1.1
∠
–180°
0
∠
0°
0.860
∠
0°
2.882
∠
0°
Slope 2
A
0.4
∠
0°
15
∠
–180°
7.915
∠
–180°
8.646
∠
–180°
Block
I
d
/
I
r
= 91.5%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.4
∠
–180°
0
∠
0°
7.915
∠
0°
8.646
∠
0°
Slope 2
A
0.2
∠
0°
15
∠
–180°
7.918
∠
–180°
8.650
∠
–180°
Operate
I
d
/
I
r
= 95.7%
B
0
∠
0°
0
∠
0°
0
∠
0°
0
∠
0°
C
0.2
∠
–180°
0
∠
0°
7.916
∠
0°
8.650
∠
0°
828737A1.CDR
D
/
y30
° Transformer
Fault
I (f) = 0.577 pu
0°
A
∠
I (f) = 0
b
I (f) = 1 pu
0°
a
∠
I (f) = 0
c
I (f) = 0 pu
B
I (f) = 0.577 pu
–180°
C
∠
A
B
C
A
B
C
Summary of Contents for T60
Page 6: ...vi T60 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 14: ...xiv T60 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 34: ...1 20 T60 Transformer Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 490: ...5 344 T60 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 522: ...6 32 T60 Transformer Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 536: ...7 14 T60 Transformer Protection System GE Multilin 7 1 COMMANDS 7 COMMANDS AND TARGETS 7 ...
Page 568: ...10 12 T60 Transformer Protection System GE Multilin 10 6 DISPOSAL 10 MAINTENANCE 10 ...
Page 596: ...A 28 T60 Transformer Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 716: ...B 120 T60 Transformer Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 762: ...E 10 T60 Transformer Protection System GE Multilin E 1 IEC 60870 5 104 PROTOCOL APPENDIX E E ...
Page 774: ...F 12 T60 Transformer Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...