GE L60 Instructions Manual page 560

CONTROL ELEMENTS
Zone 1 extent
The zone 1 extension philosophy here is to apply an overreaching zone permanently as long as the relay is ready to
reclose, and reduce the reach when reclosing. Another zone 1 extension approach is to operate normally from an
underreaching zone, and use an overreaching distance zone when reclosing the line with the other line end open. This
philosophy can be programmed via the line pickup scheme.
The "Extended Zone 1" is 0 when autoreclose is in lockout or disabled and 1 when autoreclose is in reset.
• When "Extended Zone 1" is 0, the distance functions are set to normal underreach Zone 1 setting
• When "Extended Zone 1" is 1, the distance functions can be set to Extended Zone 1 Reach, which is an overreaching
setting
• During a reclose cycle, "Extended Zone 1" goes to 0 as soon as the first CLOSE BREAKER signal is issued
0) and remains 0 until the recloser goes back to reset
>
Settings
The single-phase autoreclose settings are as follows.
— This setting selects the Autoreclose operating mode from the four available reclose modes (Mode 1: 1 & 3 Pole,
AR MODE
Mode 2: 1 Pole, Mode 3: 3 Pole-A and Mode 4: 3 Pole-B), which functions in conjunction with signals received at the initiation
inputs as described. The autorecloser runs in this mode until a different mode is activated through the AR Mode Activation
inputs explained as follows.
to
Mode 1 Mode 4 Activation
change via activation input takes place when only one of the four activation inputs is high and the
(that is, reclose is not in progress) and also the mode to be activated is different from the existing mode, otherwise the
activation input is ignored and the existing mode continues to be used. See details in the Mode Control Logic diagram.
5
AR MAX NUMBER OF SHOTS
lockout when the fault is permanent.
— This setting selects the autoreclose initiation mode. When selected as "Protection AND CB," the
AR INITIATE MODE
autoreclose element is initiated by protection operation and begins incrementing the autoreclose dead time timer when a
circuit breaker is open. Breaker status is determined from breaker auxiliary contacts which need to be correctly configured
in breaker settings. In "Protection only" initiation mode, the autoreclose element is initiated by protection operation and
begins incrementing the dead time when protection resets, without the need of breaker auxiliary contacts.
— This input selects an operand that blocks the reclose command for breaker 1. This condition can be for
AR BLOCK BKR1
example: breaker low air pressure, reclose in progress on another line (for the central breaker in a breaker and a half
arrangement), or a sum of conditions combined in FlexLogic.
AR CLOSE TIME BKR1
sent to the moment the breaker contacts are closed in the "Protection AND CB" mode or when Open Pole is reset in the
"Protection only" mode. In the "Protection Only" mode,
case of the unsuccessful reclose attempt or 20 ms after Open Pole is reset in case of the successful reclosure attempt.
AR BKR MAN CLOSE
associated with the autoreclose scheme.
AR BLK TIME UPON MAN CLS
circuit breaker is manually commanded to close, preventing reclosing onto an existing fault such as grounds on the line.
This delay must be longer than the slowest expected trip from any protection not blocked after manual closing. If the
autoreclose scheme is not initiated after a manual close and this time expires the autoreclose scheme is set to the reset
state.
— This setting selects a FlexLogic operand that is intended to initiate single-pole autoreclosure.
AR 1P INIT
— This setting selects a FlexLogic operand that is intended to initiate three-pole autoreclosure, first timer (
AR 3P INIT
) that can be used for a high-speed autoreclosure.
DEAD TIME 1
— This setting selects a FlexLogic operand intended to initiate three-pole autoreclosure. second timer (
AR 3P TD INIT
) can be used for a time-delay autoreclosure. If the operand assigned to this setting and the
DEAD TIME 2
are asserted simultaneously, then autoreclose does not activate the first and second shot timers at the same time.
Instead, the priority is given to the
5-352
— This setting selects an operand for activating the corresponding AR mode in runtime. Mode
— This setting specifies the number of reclosures that can be attempted before reclosure goes to
— This setting represents the closing time for the breaker 1 from the moment the "Close" command is
— This setting selects a FlexLogic operand that represents manual close command to a breaker
— The autoreclose scheme can be disabled for a programmable time delay after an associated
operand.
AR 3P INIT
is reset if either protection operates again in the
AR1 CLOSE BRK 1
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
(AR SHOT COUNT
operand is low
AR RIP
AR 3P
AR 3P
setting
AR 3P INIT