GE Multilin
L90 Line Current Differential System
5-221
5 SETTINGS
5.6 GROUPED ELEMENTS
5
•
NEG SEQ DIR OC1 FWD PICKUP:
This setting defines the pickup level for the overcurrent unit in the forward direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selection, this pickup threshold applies to zero- or negative-sequence current. When
selecting this setting it must be kept in mind that the design uses a
positive-sequence restraint
technique.
•
NEG SEQ DIR OC1 REV LIMIT ANGLE:
This setting defines a symmetrical (in both directions from the ECA) limit
angle for the reverse direction.
•
NEG SEQ DIR OC1 REV PICKUP:
This setting defines the pickup level for the overcurrent unit in the reverse direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selection, this pickup threshold applies to zero- or negative-sequence current. When
selecting this setting it must be kept in mind that the design uses a
positive-sequence restraint
technique.
Figure 5–113: NEGATIVE SEQUENCE DIRECTIONAL OC1 SCHEME LOGIC
827091A7.CDR
AND
AND
AND
AND
AND
OR
OR
NOTE:
V_2 is negative-sequence voltage
I_2 is negative-sequence current
I_0 is zero-sequence current
AND
SETTING
Off = 0
Block
SETTING
= Neg Sequence
= Zero Sequence
Type
SETTINGS
Forward Pickup
RUN
( |3I_0| – × |I_1| ) Pickup
K
≥
Positive-Sequence Restraint
TIMER
1.25 cycles
1.5 cycles
FLEXLOGIC OPERAND
NEG SEQ DIR OC1 FWD
SETTING
Enabled = 1
Function
ACTUAL VALUES
V_2
I_2
I_0
RUN
( |I_2| – × |I_1| ) Pickup
K
≥
Voltage Polarization
SETTINGS
Forward ECA
RUN
Forward Limit Angle
Reverse Limit Angle
Offset
Forward
Reverse
SETTINGS
Reverse Pickup
RUN
( |I_2| – × |I_1| ) Pickup
K
≥
Pos Seq Restraint
RUN
( |3I_0| – × |I_1| ) Pickup
K
≥
AND
AND
AND
FLEXLOGIC OPERAND
NEG SEQ DIR OC1 REV
Summary of Contents for UR Series L90
Page 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...
