GE UR series

GE Multilin L60 Line Phase Comparison System 5-241
5 SETTINGS 5.6 CONTROL ELEMENTS
5
AR PROGRAMS:
The autorecloser provides four programs that can cause from one to four reclose attempts (shots). After the first shot, all
subsequent recloses will 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 will go 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 below:
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.
BASIC RECLOSING OPERATION:
Reclosing operation is determined primarily by the
AR MODE and AR BKR SEQUENCE settings. The reclosing sequences are
started by the initiate inputs. A reclose initiate signal will send the scheme into the reclose-in-progress (RIP) state, asserting
the
AR RIP FlexLogic™ operand. The scheme is latched into the RIP state and resets only when an AR CLS BKR 1 (autore-
close breaker 1) or
AR CLS BKR 2 (autoreclose breaker 2) operand is generated or the scheme goes to the Lockout state.
The dead time for the initial reclose operation will be determined by either the
AR 1-P DEAD TIME, AR 3-P DEAD TIME 1, or AR
3-P DEAD TIME 2
setting, depending on the fault type and the mode selected. After the dead time interval the scheme will
assert the
AR CLOSE BKR 1 or AR CLOSE BKR 2 operands, as determined by the sequence selected. These operands are
latched until the breaker closes or the scheme goes to Reset or Lockout.
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 5–24: 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