GE L90 Instruction Manual page 419

5 SETTINGS
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 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
in 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 below:
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
BASIC RECLOSING OPERATION:
Reclosing operation is determined primarily by the
started by the initiate inputs. A reclose initiate signal will send the scheme into the reclose-in-progress (RIP) state, asserting
the FlexLogic™ operand. The scheme is latched into the RIP state and resets only when an
AR RIP
close breaker 1) or
AR CLS BKR 2
The dead time for the initial reclose operation will be determined by either the
setting, depending on the fault type and the mode selected. After the dead time interval the scheme will
3-P DEAD TIME 2
assert the or
AR CLOSE BKR 1
latched until the breaker closes or the scheme goes to Reset or Lockout.
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
AR MODE
(autoreclose breaker 2) operand is generated or the scheme goes to the Lockout state.
operands, as determined by the sequence selected. These operands are
AR CLOSE BKR 2
L90 Line Current Differential System
FlexLogic™ operand is set. This operand can be used
THIRD SHOT
MULTI- SINGLE- MULTI-
PHASE PHASE PHASE
FAULT FAULT FAULT
3 POLE or 3 POLE or 3 POLE or
LO LO
3 POLE or 3 POLE or 3 POLE or
LO LO
LO 3 POLE or
LO
3 POLE or 3 POLE or 3 POLE or
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
and settings. The reclosing sequences are
AR BKR SEQUENCE
AR 1-P DEAD TIME
5.7 CONTROL ELEMENTS
FOURTH SHOT
SINGLE- MULTI-
PHASE PHASE
FAULT FAULT
3 POLE or 3 POLE or
LO LO LO
3 POLE or 3 POLE or
LO LO LO
LO 3 POLE or LO
LO
3 POLE or 3 POLE or
LO LO LO
AR 3-P DEAD TIME 2
for the first
AR 3-P DEAD TIME 1
timers.
AR 3-P DEAD TIME 2(4)
(autore-
AR CLS BKR 1
, , or
AR 3-P DEAD TIME 1
5-273
5
AR