Breaker Functions - GE Feeder Management Relay 750 Instruction Manual

5 SETPOINTS
PATH: SETPOINTS S3 LOGIC INPUTS
BRKR FUNCTIONS
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The following logic functions are used to determine whether the circuit breaker is open, closed, or disconnected from the
main power circuit, as monitored by auxiliary contacts on a drawout breaker racking mechanism, or on the associated iso-
lating disconnect switches on a fixed circuit breaker.
If neither the 52a or 52b contacts are installed then the following functions cannot be performed:
• Monitoring of breaker position
• Breaker Operation Failure
• Feedback control of Trip (Output Relay 1) and Close (Output Relay 2) relays
• Trip/Close Coil Supervision Without Permissive
• Manual close feature blocking
• Autoreclose
• Transfer
It is strongly recommended that the Breaker Operation Failure alarm be enabled when either 52a or 52b
breaker auxiliary contacts are installed.
CAUTION
Breaker logic functions must be assigned to Logic Inputs 1 to 14 as they must only be contacts.
CAUTION
The and
52a CONTACT 52b CONTACT
mines how these contacts affect the breaker state:
52/A CONTACT 52/B CONTACT
INSTALLED? INSTALLED?
Yes
Yes
No
No
When asserted, the logic input assigned by the
primary system. When the breaker is determined to be disconnected, the breaker state is shown to be neither open nor
closed. For further information regarding operation with only one auxiliary breaker contact, see Section 4.1.2: LED Status
Indicators on page 4–2.
GE Multilin
Courtesy of NationalSwitchgear.com
BRKR FUNCTIONS
ð
ENTER 52a CONTACT:
ESCAPE
Disabled
52b CONTACT:
ESCAPE
MESSAGE Disabled
BRKR CONTACT:
ESCAPE
MESSAGE Disabled
setpoints are used to monitor the 52/a and 52/b contacts. The following table deter-
INTERPRETATION
Yes 52a closed indicates breaker is closed
52b closed indicates breaker is open
No 52a closed indicates breaker is closed
52a open indicates breaker is open
Yes 52b open indicates breaker is closed
52b closed indicates breaker is open
No Breaker status unknown
BRKR CONNECTED
750/760 Feeder Management Relay

5.4.3 BREAKER FUNCTIONS

Range: Input 1 to Input 20, Disabled
Range: Input 1 to Input 20, Disabled
Range: Input 1 to Input 20, Disabled
setpoint indicates that the breaker is connected to the
5.4 S3 LOGIC INPUTS
5-21
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