GE UR Series L90 Instruction Manual page 461

5 SETTINGS
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.
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
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
connection with the tripping logic to cause a three-pole trip for single-phase faults.
Table 5–30: AUTORECLOSE PROGRAMS
MODE AR MODE
SINGLE-
PHASE
FAULT
1 1 & 3 POLE 1 POLE
2 1 POLE 1 POLE
3 3 POLE-A 3 POLE
4 3 POLE-B 3 POLE
The four autoreclose modes are described as follows.
1. "1 & 3 Pole": In this mode, the autorecloser starts the
gle-phase initiated, the
AR 3-P DEAD TIME 1
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
2. "1 Pole": In this mode, the autorecloser starts 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)
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
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
4. "3 Pole-B": In this mode, the autorecloser is initiated for any type of fault and starts the
shot. If the initiating signal is
are enabled, the second, third, and fourth shots are always three-phase and start the
GE Multilin
AR FORCE 3-P
FIRST SHOT SECOND SHOT
MULTI- SINGLE-
PHASE PHASE
FAULT FAULT
3 POLE 3 POLE or
LO
LO 3 POLE or
LO
LO 3 POLE or
LO
3 POLE 3 POLE or
LO
AR 1-P DEAD TIME
timer if the autoreclose is three-pole initiated, and the
AR 3-P DEAD TIME 2(4)
AR 1-P DEAD TIME
timers.
for the first shot if the fault is single phase. If the fault is multi phase the
timers.
AR 3-P DEAD TIME 2(4)
the scheme starts
AR 3P TD INIT
L90 Line Current Differential System
FlexLogic operand is set. This operand can be used in
THIRD SHOT
MULTI- SINGLE- MULTI-
PHASE PHASE PHASE
FAULT FAULT FAULT
3 POLE or 3 POLE or 3 POLE or
LO LO LO
3 POLE or 3 POLE or 3 POLE or
LO LO LO
LO 3 POLE or LO
LO
3 POLE or 3 POLE or 3 POLE or
LO LO LO
timer for the first shot if the autoreclose is sin-
timers.
for the first shot if the fault is single phase. If the
for the first shot. If two or more shots
AR 3-P DEAD TIME 2
AR 3-P DEAD TIME 2(4)
5.7 CONTROL ELEMENTS
FOURTH SHOT
SINGLE- MULTI-
PHASE PHASE
FAULT FAULT
3 POLE or 3 POLE or
LO LO
3 POLE or 3 POLE or
LO LO
3 POLE or LO
LO
3 POLE or 3 POLE or
LO LO
AR 3-P DEAD TIME 2
for the first
AR 3-P DEAD TIME 1
timers.
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