GE 850 - Page 541

CHAPTER 8: CONTROL BUS TRANSFER
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 8–69
– Tie-breaker connected and closed
– Selected to Trip input set to Bus Tie breaker
– Transfer scheme not blocked.
INC 1 BKR CONNECTED & CLOSED
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to provide a condition for “Selected to Trip” breaker logic if Incomer 1 breaker is
racked-in (connected) and closed.
INC 2 BKR CONNECTED & CLOSED
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to provide a condition for “Selected to Trip” breaker logic if Incomer 2 breaker is
racked-in (connected) and closed.
TIE BREAKER CLOSED
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to track the Breaker Closed state. Typically, a 52a auxiliary breaker contact or a
Breaker Closed state from the Breaker Detection control element is used to indicate
close state of the breaker for preventing the two incoming power systems from being
connected in parallel and permitting transfer logic.
CLOSE TIE FROM INCOMER 1
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to signal from Incomer 1 to the Bus Tie Breaker to start the CLOSE operation.
CLOSE TIE FROM INCOMER 2
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand, digital input, virtual input or remote input
used to signal from Incomer 2 to the Bus Tie Breaker to start the CLOSE operation.
BLOCK TRANSFER
Range: Off, Any FlexLogic operand
Default: Off
The Transfer is blocked when the selected operand is asserted.
FAST PATH:
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