GE Multilin
L90 Line Current Differential System
5-323
5 SETTINGS
5.7 CONTROL ELEMENTS
5
When used in two breaker applications, the reclosing sequence is selectable. The reclose signal can be sent to one
selected breaker only, to both breakers simultaneously or to both breakers in sequence (one breaker first and then, after a
delay to check that the reclose was successful, to the second breaker). When reclosing in sequence, the first breaker
should reclose with either the single-pole or three-pole dead time according to the fault type and reclose mode; the second
breaker should follow the successful reclosure of the first breaker. When reclosing simultaneously, for the first shot both
breakers should reclose with either the single-pole or three-pole dead time, according to the fault type and the reclose
mode.
The signal used to initiate the autoreclose scheme is the trip output from protection. This signal can be single pole tripping
for single phase faults and three phase tripping for multi-phase faults. The autoreclose scheme has five operating states.
AR PROGRAMS:
The autorecloser provides four programs that can cause from one to four reclose attempts (shots). After the first shot, all
subsequent recloses are always be three-pole. If the maximum number of shots selected is “1” (only one reclose attempt)
and the fault is persistent, after the first reclose the scheme goes to lockout upon another Initiate signal.
For the 3-pole reclose programs (modes 3 and 4), an
AR FORCE 3-P
FlexLogic operand is set. This operand can be used in
connection with the tripping logic to cause a three-pole trip for single-phase faults.
The four autoreclose modes are described as follows.
1.
“1 & 3 Pole”: In this mode, the autorecloser starts the
AR 1-P DEAD TIME
timer for the first shot if the autoreclose is sin-
gle-phase initiated, the
AR 3-P DEAD TIME 1
timer if the autoreclose is three-pole initiated, and the
AR 3-P DEAD TIME 2
timer if the autoreclose is three-phase time delay initiated. If two or more shots are enabled, the second, third, and
fourth shots are always three-pole and start the
AR 3-P DEAD TIME 2(4)
timers.
2.
“1 Pole”: In this mode, the autorecloser starts the
AR 1-P DEAD TIME
for the first shot if the fault is single phase. If the
fault is three-phase
or a three-pole trip on the breaker occurred during the single-pole initiation
, the scheme goes to
lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are always three-pole
and start the
AR 3-P DEAD TIME 2(4)
timers.
3.
“3 Pole-A”: In this mode, the autorecloser is initiated only for single phase faults, although the trip is three pole. The
autorecloser uses the
AR 3-P DEAD TIME 1
for the first shot if the fault is single phase. If the fault is multi phase the
scheme will go to Lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are
always three-phase and start the
AR 3-P DEAD TIME 2(4)
timers.
4.
“3 Pole-B”: In this mode, the autorecloser is initiated for any type of fault and starts the
AR 3-P DEAD TIME 1
for the first
shot. If the initiating signal is
AR 3P TD INIT
the scheme starts
AR 3-P DEAD TIME 2
for the first shot. If two or more shots
are enabled, the second, third, and fourth shots are always three-phase and start the
AR 3-P DEAD TIME 2(4)
timers.
STATE
CHARACTERISTICS
Enabled
Scheme is permitted to operate
Disabled
Scheme is not permitted to operate
Reset
Scheme is permitted to operate and shot count is reset to 0
Reclose in progress
Scheme has been initiated but the reclose cycle is not finished (successful or not)
Lockout
Scheme is not permitted to operate until reset received
Table 5–30: AUTORECLOSE PROGRAMS
MODE
AR MODE
FIRST SHOT
SECOND SHOT
THIRD SHOT
FOURTH SHOT
SINGLE-
PHASE
FAULT
MULTI-
PHASE
FAULT
SINGLE-
PHASE
FAULT
MULTI-
PHASE
FAULT
SINGLE-
PHASE
FAULT
MULTI-
PHASE
FAULT
SINGLE-
PHASE
FAULT
MULTI-
PHASE
FAULT
1
1 & 3 POLE
1 POLE
3 POLE
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
2
1 POLE
1 POLE
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3
3 POLE-A
3 POLE
LO
3 POLE or
LO
LO
3 POLE or
LO
LO
3 POLE or
LO
LO
4
3 POLE-B
3 POLE
3 POLE
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
3 POLE or
LO
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 ...
