8-10
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
DIFFERENTIAL CHARACTERISTIC TEST EXAMPLES
CHAPTER 8: COMMISSIONING
8
8.2.4 Test example 3
8.2.4.1 Yg/D30° transformer with phase B to C fault on the Delta side
Transformer data — Y/D30°, 20 MVA, 115/12.47 kv, CT1 (200:1), CT2 (1000:1)
Figure 8-4: Current Distribution on a Yg/D30° transformer with an a to b fault on the LV side
Three adjustable currents are required in this case. The Phase A and C Wye-side line currents, identical in magnitude but
displaced by 180°, can be simulated with one current source passed through these relay terminals in series. The second
current source simulates the Phase B primary current. The third source simulates the delta “b” and “c” phase currents, also
equal in magnitude but displaced by 180°.
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°
Test
Phase
Injected current
Displayed current
Status
W1 current
W2 current
Differential
Restraint
Содержание T35
Страница 9: ...TABLE OF CONTENTS T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL ix ABBREVIATIONS INDEX ...
Страница 10: ...x T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 14: ...1 4 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL FOR FURTHER ASSISTANCE CHAPTER 1 INTRODUCTION 1 ...
Страница 202: ...4 88 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL FLEXLOGIC DESIGN USING ENGINEER CHAPTER 4 INTERFACES 4 ...
Страница 472: ...5 270 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 500: ...6 28 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL PRODUCT INFORMATION CHAPTER 6 ACTUAL VALUES 6 ...
Страница 514: ...7 14 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 580: ...A 16 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 588: ...C 6 T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL COMMAND LINE INTERFACE APPENDIX C COMMAND LINE INTERFACE C ...
Страница 596: ...iv T35 TRANSFORMER PROTECTION SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...