GE C60 Instruction Manual page 135

5 SETTINGS
In two breaker schemes, if one breaker is in the OUT OF SERVICE state and the other is closed at the end of the reset
time, the scheme will also reset. If at the end of the reset time at least one breaker, which is not in the OUT OF SERVICE
state, is open the scheme will be sent to Lockout.
The reset timer will be stopped if the reclosure sequence is not successful: an initiating signal is present or the scheme is in
the Lockout state. The reset timer will also be stopped if the breaker is manually closed or the scheme is otherwise reset
from lockout.
LOCKOUT:
When a reclose sequence is started by an initiate signal the scheme moves into the Reclose In Progress state and starts
the Incomplete Sequence Timer. The setting of this timer determines the maximum time interval allowed for a single reclose
shot. If a close breaker 1 or 2 signal is not present before this time expires, the scheme goes to "Lockout".
There are four other conditions that can take the scheme to the Lockout state, as shown below:
• Receipt of "Block" input while in the Reclose in Progress state
• The reclosing program logic: when a 3P Initiate is present and the autoreclose mode is either 1 Pole or 3Pole-A (3 pole
autoreclose for single pole faults only)
• Initiation of the scheme when the count is at the maximum allowed
• If at the end of the reset time at least one breaker, which is not in the OUT OF SERVICE state, is open the scheme will
be sent to Lockout. The scheme will be also sent to Lockout if one breaker fails to reclose and the setting
is set to "Lockout".
OPTION
Once the Lockout state is set it will be latched in until the scheme is intentionally reset from Lockout or a breaker is manu-
ally closed.
BREAKER OPEN BEFORE FAULT:
A logic circuit is provided that inhibits the close breaker 1(2) output if a reclose initiate (RIP) indicator is not present within
30 ms of the "Breaker any phase open" input. This feature is intended to prevent reclosing if one of the breakers was open
in advance of a reclose initiate input to the recloser. This logic circuit resets when the breaker is closed.
TRANSFER RECLOSE WHEN BREAKER IS BLOCKED:
1. When the reclosing sequence 1-2 is selected and breaker No. 1 is blocked (AR BKR1 BLK operand is set) the reclose
signal can be transferred direct to the breaker No. 2 if
be sent to LOCKOUT by the incomplete sequence timer.
2. When the reclosing sequence 2-1 is selected and breaker No. 2 is blocked (AR BKR2 BLK operand is set) the reclose
signal can be transferred direct to the breaker No.1 if
be sent to LOCKOUT by the incomplete sequence timer.
FORCE 3-POLE TRIPPING:
The reclosing scheme contains logic that is used to signal trip logic that three-pole tripping is required for certain conditions.
This signal is activated by any of the following:
• Autoreclose scheme is Disabled.
• Autoreclose scheme is in the Lockout state.
• Autoreclose mode is programmed for three-pole operation
• The shot counter is not at 0, i.e. the scheme is not in the Reset state. This ensures a second trip will be three-pole
when reclosing onto a permanent single phase fault.
• 8 ms after the single-pole reclose is initiated by the AR 1P INIT signal.
ZONE 1 EXTENT:
"Extended Zone 1" is 0 when the AR is in LO or Disabled and 1 when the AR is in Reset.
1. When "Extended Zone 1" is 0, the distance functions shall be set to normal underreach Zone 1 setting.
2. When "Extended Zone 1" is 1, the distance functions may be set to Extended Zone 1 Reach, which is an overreaching
setting.
3. During a reclose cycle, "Extended Zone 1" goes to 0 as soon as the first CLOSE BREAKER signal is issued (AR SHOT
COUNT > 0) and remains 0 until the recloser goes back to Reset.
GE Multilin
AR TRANSFER 1 TO 2
AR TRANSFER 2 TO 1
C60 Breaker Management Relay
5.6 CONTROL ELEMENTS
is set to "Yes". If set to "No", the scheme will
is set to "YES". If set to "NO" the scheme will
AR BKR FAIL
5
5-71