
5-312
L90 Line Current Differential System
GE Multilin
5.7 CONTROL ELEMENTS
5 SETTINGS
5
g) DIRECTIONAL COMPARISON BLOCKING
PATH: SETTINGS
CONTROL ELEMENTS
PILOT SCHEMES
BLOCKING SCHEME
Generally, the scheme compares the direction to a fault at all terminals of the line. Unlike the permissive schemes, the
absence of a blocking signal permits operation of the scheme. Consequently, the scheme is biased toward dependability
and requires an "on/off" type of signaling.
By default this scheme uses only a forward-looking over-reaching zone 2 distance element to identify forward faults.
Ground directional overcurrent functions available in the relay can be used in conjunction with the zone 2 distance element
to increase the coverage for high-resistance faults. Also by default, only a reverse-looking zone 4 distance element to iden-
tify reverse faults. Ground directional overcurrent functions available in the relay can be used in conjunction with the zone 4
distance element for better time and sensitivity coordination.
For proper operation, the zone 2 and 4 phase and ground distance elements must be enabled, configured and set per rules
of distance relaying. If used by this scheme, the selected ground directional overcurrent functions must be enabled, config-
ured, and programmed accordingly.
In single-pole tripping applications, the scheme uses local fault type identification provided by the phase selector together
with information received from the remote terminal.
BLOCKING SCHEME
BLOCKING SCHEME
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
BLOCK SCHEME BLOCK:
Off
Range: FlexLogic operand
MESSAGE
BLOCK RX CO-ORD PKP
DELAY: 0.010 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
TRANS BLOCK PICKUP
DELAY: 0.030 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
TRANS BLOCK RESET
DELAY: 0.090 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
BLOCK SCHEME SEAL-IN
DELAY: 0.010 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
GND DIR O/C FWD:
Off
Range: FlexLogic operand
MESSAGE
GND DIR O/C REV:
Off
Range: FlexLogic operand
MESSAGE
BLOCK SCHEME NO OF
COMM BITS: 1
Range: 1, 2, or 4
MESSAGE
BLOCK SCHEME RX1:
Off
Range: FlexLogic operand
MESSAGE
BLOCK SCHEME RX2:
Off
Range: FlexLogic operand
MESSAGE
BLOCK SCHEME RX3:
Off
Range: FlexLogic operand
MESSAGE
BLOCK SCHEME RX4:
Off
Range: FlexLogic operand
MESSAGE
BLOCK SCHEME TARGET:
Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
BLOCK SCHEME EVENT:
Disabled
Range: Disabled, Enabled
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 ...