GE L60 Instructions Manual page 557

CHAPTER 5: SETTINGS
Table 5-42: Autoreclose programs
Mode Autoreclose First shot
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 & 3 Pole — In this mode, the autorecloser starts the
single-phase initiated, the
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
• 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 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 goes to Lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are
always three-phase and start the
• 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 sends 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
breaker 1) or (autoreclose breaker 2) operand is generated or the scheme goes to the Lockout state.
AR CLS BKR 2
The dead time for the initial reclose operation is determined by the
setting, depending on the fault type and the mode selected. After the dead time interval the scheme asserts the
TIME 2
or
CLOSE BKR 1 AR CLOSE BKR 2
breaker closes or the scheme goes to Reset or Lockout.
There are three initiate programs: single pole initiate, three pole initiate, and three pole time delay initiate. Any of these
reclose initiate signals start the reclose cycle and set the reclose-in-progress
operand is sealed-in until the Lockout or Reset signal appears.
The three-pole initiate and three-pole time delay initiate signals are latched until the
or Reset signal appears.
Autoreclose pause
The pause input offers the possibility of freezing the autoreclose cycle until the pause signal disappears. This can be done
when a trip occurs and simultaneously or previously, some conditions are detected such as out-of step or loss of guard
frequency, or a remote transfer trip signal is received. The pause signal freezes all four dead timers. When the 'pause'
signal disappears the autoreclose cycle is resumed by continuing the shot timer it was left at when paused.
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
Second shot
Multi-phase Single-
fault phase fault
3 Pole 3 Pole or
Lockout
Lockout 3 Pole or
Lockout
Lockout 3 Pole or
Lockout
3 Pole 3 Pole or
Lockout
AR 1-P DEAD TIME
timer if the autoreclose is three-pole initiated, and the
AR 3-P DEAD TIME 1
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
AR 3-P DEAD TIME 2(4)
the scheme starts
AR 3P TD INIT
AR MODE
operands, as determined by the sequence selected. These operands are latched until the
Third shot
Multi-phase Single- Multi-phase
fault phase fault fault
3 Pole or 3 Pole or 3 Pole or
Lockout Lockout Lockout
3 Pole or 3 Pole or 3 Pole or
Lockout Lockout Lockout
Lockout 3 Pole or Lockout
Lockout
3 Pole or 3 Pole or 3 Pole or
Lockout Lockout Lockout
timer for the first shot if the autoreclose is
timers.
for the first shot if the fault is single phase. If the
timers.
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 AR 3-P DEAD TIME 1
(AR RIP) operand. The reclose-in-progress
AR CLOSE
CONTROL ELEMENTS
Fourth shot
Single- Multi-phase
phase fault fault
3 Pole or 3 Pole or
Lockout Lockout
3 Pole or 3 Pole or
Lockout Lockout
3 Pole or Lockout
Lockout
3 Pole or 3 Pole or
Lockout Lockout
AR 3-P DEAD TIME 2
for the first
AR 3-P DEAD TIME 1
timers.
AR 3-P DEAD TIME 2(4)
(autoreclose
AR CLS BKR 1
, or
AR 3-P DEAD
AR
BKR2, Lockout,
BKR1, AR CLOSE
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