Breakers - GE Multilin 850 Instruction Manual

SYSTEM

Breakers

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Breaker detection ON is performed on the 850 relay by monitoring the state/states of
either one, or preferably two, contact inputs. It is highly recommended to monitor the
status of the feeder breaker using both breaker auxiliary contacts 52a, and 52b. However
using only one of them is also acceptable.
The breaker connection/disconnection to/from the power system (racked-out by the
breaker racking mechanism, or isolated by the associated disconnect switches on a fixed
circuit breaker) is provided by monitoring the contact input "BKR CONNECTED". If the
contact input selected under the "BKR CONNECTED" setpoint is asserted, the breaker is
considered connected to the primary system. When the breaker is determined
disconnected, the breaker state is shown to be neither open, nor closed.
Path:
Setpoints > System > Breakers > Breaker X
NAME
Range: Up to 13 alphanumeric characters
Default: BKR1
CONTACT INPUT 52a
Range: Off, Any FlexLogic operand
Default: Off
Selects the Contact Input connected to the breaker auxiliary contact 52a.
CONTACT INPUT 52b
Range: Off, Any FlexLogic operand
Default: Off
Selects the Contact Input connected to the breaker auxiliary contact 52b.
CONNECTED
Range: Off, Any FlexLogic operand
Default: Off
Select a contact input to show whether the breaker is connected (Racked-in, or
disconnect switches switched-on), or disconnected (racked-out, or disconnect switches
switched-off) from the system.
CLOSE RELAY SELECT
Range: Off, Relay 2
Default: Relay 2
Selection of "Relay 2" assigns the START command to Output Relay 2 (CLOSE/AUX). If "Off"
is selected, Auxiliary Relay 2 is available for selection in all elements with auxiliary relay
selection in the 869 and it is not activated by START command.
If "Relay 2" is selected, Auxiliary Relay 2 is not available for selection in any element.
Table 4-20: Breaker status depending on availability of contacts 52a and 52b
52a Contact Configured
Yes
Yes
No
No
52b Contact Configured Breaker Status
Open
Yes 52a contact open
52b contact closed
No 52a contact open
Yes 52b contact closed
No Breaker Not Configured
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Closed
52a contact closed
52b contact open
52a contact closed
52b contact open