GE L90 Instruction Manual page 444

5.7 CONTROL ELEMENTS
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.
• AR 1P INIT: This setting selects a FlexLogic operand that is intended to initiate single-pole autoreclosure.
• AR 3P INIT: This setting selects a FlexLogic operand that is intended to initiate three-pole autoreclosure, first timer (
) that can be used for a high-speed autoreclosure.
3P DEAD TIME 1
• AR 3P TD INIT: This setting selects a FlexLogic operand intended to initiate three-pole autoreclosure. second timer
(
AR 3P DEAD TIME 2
setting are asserted simultaneously, then autoreclose will not activate the first and second shot timers at the same
INIT
time. Instead, the priority is given to the
• AR MULTI-P FAULT: This setting selects a FlexLogic operand that indicates a multi-phase fault. The operand value
should be zero for single-phase to ground faults.
• BKR ONE POLE OPEN: This setting selects a FlexLogic operand which indicates that the breaker has opened cor-
rectly following a single phase to ground fault and the autoreclose scheme can start timing the single pole dead time
(for 1-2 reclose sequence for example, breaker 1 should trip single pole and breaker 2 should trip 3 pole).
The scheme has a pre-wired input that indicates breaker status.
• BKR 3 POLE OPEN: This setting selects a FlexLogic operand which indicates that the breaker has opened three pole
and the autoreclose scheme can start timing the three pole dead time. The scheme has a pre-wired input that indicates
breaker status.
• AR 3-P DEAD TIME 1: This is the dead time following the first three pole trip. This intentional delay can be used for a
high-speed three-pole autoreclose. However, it should be set longer than the estimated de-ionizing time following the
three-pole trip.
5
• AR 3-P DEAD TIME 2: This is the dead time following the second three-pole trip or initiated by the
This intentional delay is typically used for a time delayed three-pole autoreclose (as opposed to high speed three-pole
autoreclose).
• AR 3-P DEAD TIME 3: This setting represents the dead time following the third three-pole trip.
• AR 3-P DEAD TIME 4: This setting represents the dead time following the third three-pole trip.
• AR EXTEND DEAD T 1: This setting selects an operand that will adapt the duration of the dead time for the first shot
to the possibility of non-simultaneous tripping at the two line ends. Typically this is the operand set when the communi-
cation channel is out of service
• AR DEAD TIME 1 EXTENSION: This timer is used to set the length of the dead time 1 extension for possible non-
simultaneous tripping of the two ends of the line.
• AR RESET: This setting selects the operand that forces the autoreclose scheme from any state to reset. Typically this
is a manual reset from lockout, local or remote.
• AR RESET TIME: A reset timer output resets the recloser following a successful reclosure sequence. The setting is
based on the breaker time which is the minimum time required between successive reclose sequences.
• AR BKR CLOSED: This setting selects an operand that indicates that the breakers are closed at the end of the reset
time and the scheme can reset.
• AR BLOCK: This setting selects the operand that blocks the autoreclose scheme (it can be a sum of conditions such
as: time delayed tripping, breaker failure, bus differential protection, etc.). If the block signal is present before autore-
close scheme initiation the
in the RIP state the scheme will be sent to lockout.
• AR PAUSE: The pause input offers the ability to freeze the autoreclose cycle until the pause signal disappears. This
may 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. When the pause signal disappears the autoreclose
cycle is resumed. This feature can also be used when a transformer is tapped from the protected line and a reclose is
not desirable until the it is disconnected from the line. In this situation, the reclose scheme is paused until the trans-
former is disconnected.
• AR INCOMPLETE SEQ TIME: This timer is used to set the maximum time interval allowed for a single reclose shot. It
is started whenever a reclosure is initiated and is active until the
ditions allowing a breaker closure are not satisfied when this time expires, the scheme goes to "Lockout". The mini-
5-314
) can be used for a time-delay autoreclosure. If the operand assigned to this setting and the AR
AR 3P INIT
FlexLogic operand will be set. If the block signal occurs when the scheme is
AR DISABLED
L90 Line Current Differential System
operand.
or
CLOSE BKR1
5 SETTINGS
AR 3P TD INIT
signal is sent. If all con-
CLOSE BKR2
GE Multilin
AR
3P
input.