Manual Close Blocking - GE Multilin 850 Instruction Manual

CHAPTER 4: SETPOINTS

Manual Close Blocking

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
The 850 relay provides one Manual Close Blocking (MCB) element.
The 850 can be programmed to block instantaneous overcurrent elements, to raise the
Pickup level of time overcurrent elements, or to change the setpoint group, when a manual
circuit breaker close is initiated. This prevents optimally set overcurrent elements from
operating on startup to inrush currents.
Path:
Setpoints > Control > Manual Close Blocking BKR 1(X)
FUNCTION
Range: Disabled, Latched Alarm, Alarm, Configurable
Default: Disabled
MANUAL CLS BLOCK INTERVAL
Range: 0.000 to 6000.000 s - in steps of 0.001 s
Default: 5.000 s
The setting provides a time interval during which the Manual Close Blocking is active and
rise TOC Pickups, block IOC elements, or selecting setting group.
BLOCK PHASE IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to "On," the operation of the PHASE IOC 1/2 protection element is blocked after the
Manual Close Blocking condition is detected.
BLOCK NEUTRAL IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to "On," the operation of the NEUTRAL IOC 1/2 protection element is blocked after
the Manual Close Blocking condition is detected.
BLOCK GROUND IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to "On," the operation of the GROUND IOC 1 protection element is blocked after the
Manual Close Blocking condition is detected.
BLOCK SENS GROUND IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to "On," the operation of the SENSITIVE GROUND IOC 1 protection element is
blocked after the Manual Close Blocking condition is detected.
BLOCK NEG SEQUENCE IOC 1 (2, 3, 4)
Range: Off, On
Default: Off
If set to "On," the operation of the NEGATIVE SEQUENCE IOC 1 protection element is
blocked after the Manual Close Blocking condition is detected.
RAISE PHASE TOC 1 (2, 3, 4) PKP
Range: 1 to 100% in steps of 1%
Default: 0
The setpoint determines the characteristics of the PHASE TOC 1/2 protection element by
raising the Pickup level.
CONTROL
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