5-152
G30 Generator Protection System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
5.6.3 TRANSFORMER PERCENT DIFFERENTIAL (ANSI 87GT)
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 5.25)
The restraint current is calculated as a maximum of the same internally compensated currents.
(EQ 5.26)
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
r
K
max
I
1
comp
I
2
comp
(
,
)
×
=
Содержание G30
Страница 10: ...x G30 Generator Protection System GE Multilin TABLE OF CONTENTS ...
Страница 30: ...1 20 G30 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 414: ...5 274 G30 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 456: ...8 2 G30 Generator Protection System GE Multilin 8 1 DIRECTIONAL PRINCIPLE 8 THEORY OF OPERATION 8 ...
Страница 470: ...9 14 G30 Generator Protection System GE Multilin 9 1 SETTING EXAMPLE 9 APPLICATION OF SETTINGS 9 ...
Страница 484: ...11 12 G30 Generator Protection System GE Multilin 11 6 DISPOSAL 11 MAINTENANCE 11 ...
Страница 512: ...A 28 G30 Generator Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 620: ...B 108 G30 Generator Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 666: ...E 10 G30 Generator Protection System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Страница 678: ...F 12 G30 Generator Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 687: ...GE Multilin G30 Generator Protection System H 7 APPENDIX H H 2 ABBREVIATIONS H Z Impedance Zone ...