GE L90 Instruction Manual page 565

CHAPTER 5: SETTINGS
The autoreclose scheme is intended for use on transmission lines with circuit breakers operated in both the single pole and
three pole modes, in one or two breaker arrangements. The autoreclose scheme provides four programs with different
operating cycles, depending on the fault type. Each of the four programs can be set to trigger up to four reclosing
attempts. The second, third, and fourth attempts always perform three-pole reclosing and have independent dead time
delays.
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.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
AR DEAD TIME 1

EXTENSION: 0.50 s
AR RESET:

Off
AR RESET TIME:

60.00 s
AR BKR CLOSED:

Off
AR BLOCK:

Off
AR PAUSE:

Off
AR INCOMPLETE SEQ

TIME: 5.00 s
AR BLOCK BKR2:

Off
AR CLOSE TIME BKR2:

0.10 s
AR TRANSFER 1 TO 2:

No
AR TRANSFER 2 TO 1:

No
AR BKR1 FAIL OPTION:

Continue
AR BKR2 FAIL OPTION:

Continue
AR 1-P DEAD TIME:

1.00 s
AR BKR SEQUENCE:

1-2
AR TRANSFER TIME:

4.00 s
AR BUS FLT INIT:

Off
AR EVENT:

Disabled
Range: 0.00 to 655.35 s in steps of 0.01
Range: FlexLogic operand
Range: 0 to 655.35 s in steps of 0.01
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: 0 to 655.35 s in steps of 0.01
Range: FlexLogic operand
Range: 0.00 to 655.35 s in steps of 0.01
Range: Yes, No
Range: Yes, No
Range: Continue, Lockout
Range: Continue, Lockout
Range: 0 to 655.35 s in steps of 0.01
Range: 1, 2, 1&2, 1–2, 2–1
Range: 0 to 655.35 s in steps of 0.01
Range: FlexLogic operand
Range: Enabled, Disabled
CONTROL ELEMENTS
5
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