GE L90 Instruction Manual page 278

5.6 CONTROL ELEMENTS
• AR 3-P DEAD TIME 3(4): These settings represent the dead time following the third(fourth) 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 breaker(s) 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
is 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 autore-
close 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 transformer is disconnected.
5
• 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-
mum permissible setting is established by the
'wait' time for the breaker to open so that the reclose cycle can continue and/or for the
allow the reclose cycle to continue and/or for the
signal to be sent.
• AR BLOCK BKR2: This input selects an operand that will block the reclose command for Breaker 2. This condition
can be for 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 BKR2 MNL CLOSE: This setting selects an operand asserted when Breaker 2 is manually commanded to close.
• AR CLOSE TIME BKR2: This setting represents the closing time for the Breaker 2 from the moment the 'Close' com-
mand is sent to the moment the contacts are closed.
• AR TRANSFER 1 TO 2: This setting establishes how the scheme performs when the breaker closing sequence is 1-2
and Breaker 1 is blocked. When set to "Yes" the closing command will be transferred direct to Breaker 2 without wait-
ing the transfer time. When set to "No" the closing command will be blocked by the
scheme will be sent to Lockout by the incomplete sequence timer.
• AR TRANSFER 2 TO 1: This setting establishes how the scheme performs when the breaker closing sequence is 2-1
and Breaker 2 is blocked. When set to "Yes" the closing command will be transferred direct to Breaker 1 without wait-
ing the transfer time. When set to "No", the closing command will be blocked by the
scheme will be sent to Lockout by the incomplete sequence timer.
• AR BKR1 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 1-
2 and Breaker 1 has failed to close. When set to "Continue" the closing command will be transferred to Breaker 2
which will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to
Lockout). When set to "Lockout" the scheme will go to lockout without attempting to reclose Breaker 2.
• AR BKR2 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 2-
1 and Breaker 2 has failed to close. When set to "Continue" the closing command will be transferred to Breaker 1
which will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to
Lockout). When set to "Lockout" the scheme will go to lockout without attempting to reclose Breaker 1.
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FlexLogic™ operand will be set. If the block signal occurs when the scheme
AR DISABLED
AR 3-P DEAD TIME 2
AR BKR1(2) BLK
L90 Line Differential Relay
or
CLOSE BKR1 CLOSE BKR2
timer setting. Settings beyond this will determine the
AR PAUSE
signal to disappear and allow the
AR BKR1 BLK
AR BKR2 BLK
5 SETTINGS
signal is sent. If all con-
signal to reset and
AR CLOSE BKR1(2)
signal and the
signal and the
GE Multilin