CHAPTER 7: PROTECTION CONTROL ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 339
Autoreclose programs
The autorecloser provides four programs that can cause from one to four reclose attempts
(shots). After the first shot, all subsequent reclosings are always 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 three-pole reclose programs (the “3 Pole-A” and “3 Pole-B” mode values), 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.
Table 19: Autoreclose programs
In the “1 & 3 Pole” mode, the autorecloser starts the
1-P Dead Time timer for the first shot if
the autoreclose is single-phase initiated, the
3-P Dead Time 1 timer if the autoreclose is
three-pole initiated, and the
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
3-P Dead Time 2 through 3-P Dead Time 4 timers.
In the “1 Pole” mode, the autorecloser starts the
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
3-P Dead Time 2 through 3-P Dead Time 4 timers.
In the “3 Pole-A” mode, the autorecloser is initiated only for single-phase faults, although
the trip is three-pole. The autorecloser uses the
3-P Dead Time 1 for the first shot if the fault
is single-phase. If the fault is multi-phase the 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-P Dead Time 2 through 3-P Dead Time 4 timers.
In the “3 Pole-B” mode, the autorecloser is initiated for any type of fault and starts the
3-P
Dead Time 1 for the first shot. If the initiating signal is AR 3P TD INIT, the scheme starts the 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 3-P Dead Time 2 through 3-P Dead Time
4 timers.
Basic reclosing operation
Reclosing is enabled via settings and dynamically disabled from a line pickup operation, a
block signal, or a manual close. Once enabled, a reclose is initiated from the trip output
scheme or through the
1-Pole Initiate and 3-Pole Initiate user-programmable inputs. 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 (AR RIP) operand. The reclose-in-progress operand is sealed-in until the
lockout or reset signal appears.
Mode
setting
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 & 3
Pole”
1 POLE 3 POLE 3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
“1 Pole” 1 POLE LOCKOUT 3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
“3 Pole-A” 3 POLE LOCKOUT 3 POLE or
LOCKOUT
LOCKOUT 3 POLE or
LOCKOUT
LOCKOUT 3 POLE or
LOCKOUT
LOCKOUT
“3 Pole-B” 3 POLE 3 POLE 3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
3 POLE or
LOCKOUT
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