5-214
T60 Transformer Protection System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
b) PERCENT DIFFERENTIAL
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
TRANSFORMER
PERCENT DIFFERENTIAL
The calculation of differential (
I
d
) and restraint (
I
r
) currents for the purposes of the percent differential element is described
by the following block diagram, where “
Σ
” has as its output the vector sum of inputs, and “max” has as its output the input of
maximum magnitude; these calculations are performed for each phase.
The differential current is calculated as a vector sum of currents from all windings after magnitude and angle compensation.
(EQ 5.27)
The restraint current is calculated as a maximum of the same internally compensated currents.
(EQ 5.28)
The element operates if
I
d
> PKP and
I
d
/
I
r
>
K
, where PKP represents a percent differential pickup setting and
K
is a
restraint factor defined by the relays settings Slope 1, Slope 2, and a transition area between breakpoint 1 and breakpoint 2
settings.
PERCENT
DIFFERENTIAL
PERCENT DIFFERENTIAL
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
PERCENT DIFFERENTIAL
PICKUP: 0.100
pu
Range: 0.050 to 1.000 pu in steps of 0.001
MESSAGE
PERCENT DIFFERENTIAL
SLOPE 1: 25%
Range: 15 to 100% in steps of 1
MESSAGE
PERCENT DIFFERENTIAL
BREAK 1: 2.000 pu
Range: 1.000 to 2.000 pu in steps of 0.001
MESSAGE
PERCENT DIFFERENTIAL
BREAK 2: 8.000 pu
Range: 2.000 to 30.000 pu in steps of 0.001
MESSAGE
PERCENT DIFFERENTIAL
SLOPE 2: 100%
Range: 50 to 100% in steps of 1
MESSAGE
INRUSH INHIBIT
FUNCTION: Adapt. 2nd
Range: Disabled, Adapt. 2nd, Trad. 2nd
MESSAGE
INRUSH INHIBIT
MODE: Per phase
Range: Per phase, 2-out-of-3, Average
MESSAGE
INRUSH INHIBIT
LEVEL: 20.0% fo
Range: 1.0 to 40.0% of f
0
in steps of 0.1
MESSAGE
OVEREXCITN INHIBIT
FUNCTION: Disabled
Range: Disabled, 5th
MESSAGE
OVEREXCITN INHIBIT
LEVEL: 10.0% fo
Range: 1.0 to 40.0% of f
0
in steps of 0.1
MESSAGE
PERCENT DIFF BLOCK:
Off
Range: FlexLogic operand
MESSAGE
PERCENT DIFFERENTIAL
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
PERCENT DIFFERENTIAL
EVENTS: Disabled
Range: Disabled, Enabled
I
d
I
1
comp
I
2
comp
I
3
comp
I
4
comp
I
5
comp
+
+
+
+
=
I
r
max
I
1
comp
I
2
comp
I
3
comp
I
4
comp
I
5
comp
,
,
,
(
,
)
=
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 ...