9-6
T60 Transformer Protection System
GE Multilin
9.2 DIFFERENTIAL CHARACTERISTIC TEST EXAMPLES
9 COMMISSIONING
9
d) SLOPE 1 TEST
Inject current in such a manner that the magnitude of
I
r
is larger than the restraint current of 0.67 pu, corresponding to the
intersection of the minimum PKP and Slope 1 and smaller than the Breakpoint 1 setting; that is,
(EQ 9.9)
1.
Change the current magnitudes as follows:
2.
The following differential and restraint current should be read from the T60 actual values menu:
The Percent Differential element will not operate even though
I
d
is larger than the Minimum Pickup, because
I
d
is not large enough to make the
ratio larger than the Slope 1 setting of 15%. The actual ratio is 11.3%.
3.
Adjust the
I
1
current as shown below (thereby increasing
I
d
) and verify that the element operates.
4.
The following differential and restraint current should appear in the T60 actual values menu:
5.
The actual
ratio is now 17%. Verify that the element operates correctly.
WINDING 1
WINDING 2
PHASE SINGLE CURRENT (I
1
)
PHASE SINGLE CURRENT (I
2
)
A
0 A
∠
0°
A
0 A
∠
0°
B
0.48 A
∠
0°
B
1 A
∠
–180°
C
0.48 A
∠
–180°
C
1 A
∠
0°
PHASE DIFFERENTIAL CURRENT (I
d
)
PHASE RESTRAINT CURRENT (I
r
)
A
0
∠
0°
A
0
∠
0°
B
0.113 pu
∠
0°
B
1 pu
∠
–180°
C
0.113 pu
∠
0°
C
1 pu
∠
0°
WINDING 1
WINDING 2
PHASE SINGLE CURRENT (I
1
)
PHASE SINGLE CURRENT (I
2
)
A
0 A
∠
0°
A
0 A
∠
0°
B
0.45 A
∠
0°
B
1 A
∠
–180°
C
0.45 A
∠
–180°
C
1 A
∠
0°
PHASE DIFFERENTIAL CURRENT (I
d
)
PHASE RESTRAINT CURRENT (I
r
)
A
0
∠
0°
A
0
∠
0°
B
0.170 pu
∠
0°
B
1 pu
∠
–180°
C
0.170 pu
∠
0°
C
1 pu
∠
0°
I
r
intersection of Min PKP and Slope 1
(
)
I
r
actual
(
)
I
r
Break 1
(
)
<
<
NOTE
I
d
I
r
⁄
I
d
I
r
⁄
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 ...