GE Multilin
T35 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 T35 UR Series
Page 10: ...x T35 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 48: ...2 18 T35 Transformer Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 314: ...5 192 T35 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 338: ...6 24 T35 Transformer Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 350: ...7 12 T35 Transformer Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 366: ...8 16 T35 Transformer Protection System GE Multilin 8 2 CYBERSENTRY 8 SECURITY 8 ...
Page 406: ...A 14 T35 Transformer Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 540: ...D 10 T35 Transformer Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D ...
Page 552: ...E 12 T35 Transformer Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 560: ...F 8 T35 Transformer Protection System GE Multilin F 3 WARRANTY APPENDIX F F ...