GE Multilin 850 Instruction Manual page 498

CONTROL
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The #2 CLOSE OUTPUT relay is blocked if Transfer is enabled, but blocked while the breaker
is connected (racked-in). If breaker closing is required during maintenance, Transfer must
be disabled.
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset
850 RELAY – TIE-BREAKER
When the BUS TIE function is selected the following display is available:
TIE BREAKER CONNECTED
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to inhibit transfer if the Bus Tie breaker cannot be used to pass current from the
source to the load (for example when the breaker is in rack-out or test position). This
setpoint also provides a condition for "Selected to Trip" breaker logic, Flex logic operand
TIE CB CON & CLSD is required for Incomer 1 and Incomer 2 Circuit Breaker transfer logic
and for #2 close relay block.
For non-draw-out breakers without associated disconnect switches, this setpoint must be
set as ON.
TIE BKR SELECTED TO TRIP
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to trip the Bus Tie Breaker in the case where all three breakers become closed. This
prevents the two incoming power systems from remaining connected in parallel.
DELAY SELECT TO TRIP
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.000 s
The setting provides the selection of a time delay to be applied to the 850 trip output
relay. The following conditions must be met to start the "Delay Select To Trip" setpoint.
– Incomer 1 breaker connected and closed
– Incomer 2 breaker connected and closed
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS