GE Multilin 850

4–386 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL CHAPTER 4: SETPOINTS
Shot Path: Setpoints > Control > Autoreclose 1(X) > Shot
The AR1 RECLOSE SHOT 1 through 4 setpoints are programmed independently and are
repeated for each of the Reclosure Shots 1 through 4. These setpoints determine the Dead
Time for a given shot and the Overcurrent characteristics during that shot.
CAUTION:
Blocking on all enabled protection elements that are set to “Trip” or raising pickup level
to the value causing protection operate time to be higher than the Reset time of the
Autoreclosure for the last shot will result in 850 failure to clear the fault and must be
avoided. Doing this causes the relay to fail clearing the fault, and repeat the operation
of the Autoreclosure function without reaching the lockout state.
FAST PATH:
Selections greater than the maximum number of shots programmed in the Autoreclose
scheme setup are not used by the scheme.
DEAD TIME 1 (2, 3, 4)
Range: 0.100 to 6000.000 s in steps of 0.001 s
Default: 1.000 s (2.000/3.000/4.000 s for shot 2/3/4)
The setting specifies the Dead Time delay before each reclosure. These are the
intentional delays before the first (second, third or fourth) automatic breaker reclosure,
and should be set longer than the estimated deionized time following a three-pole Trip.
There are four time-delay settings (one per each reclosure) to be configured and used to
time out before the first (second, third or fourth) breaker reclosure.
BLOCK PHASE IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to “ON” for the selected shot(s), the operation of the PHASE IOC 1/2 protection
element is blocked after the corresponding Recloser reclosing shot.
BLOCK NEUTRAL IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to “ON” for the selected shot(s), the operation of the NEUTRAL IOC 1/2 protection
element is blocked after the corresponding Recloser reclosing shot.
BLOCK GROUND IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to “ON” for the selected shot(s), the operation of the GROUND IOC 1 protection
element is blocked after the corresponding Recloser reclosing shot.
BLOCK SENS GROUND IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to “ON” for the selected shot(s), the operation of the SENSITIVE GROUND IOC 1
protection element is blocked after the corresponding Recloser reclosing shot.
BLOCK NEG SEQENCE IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to “ON” for the selected shot(s), the operation of the NEGATIVE SEQUENCE IOC 1
protection element is blocked after the corresponding Recloser reclosing shot.