GE Multilin 850

CHAPTER 4: SETPOINTS OUTPUTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–99
NOTE
NOTE:
Aux Relay 1 is a form A output relay and is assigned in the relay firmware as "Trip", to trip
the breaker from the operation of any element with a Function setpoint set to Trip. Hence
Relay 1 (Trip) is hidden in the menu of the elements.Aux Relay 2 is a form A output relay
and is programmable under the Close Relay Select setpoint from the Breaker setup. Aux
Relay 2 is used to close the breaker upon operation of an element producing a close
command. Hence Aux Relay 2 is hidden is for selection from the menu of the elements. This
same condition applies to any other aux relay selected under the Breaker Relay Select
setpoint.
CRITICAL FAILURE RELAY
The 8 Series relay is equipped with one output relay (# 8 - “Critical Failure Relay”) for
failsafe indication. The Critical Failure Relay is a Form-C contact with one NO and one NC
contact (no control power). There are no user-programmable setpoints associated with this
output relay.
NOTE
NOTE:
Please refer to “Self-Test Errors” section from the manual for details on the status of the
output relays during Relay Not Ready state, or detection of Major Self-Test error.
MAINTAINING AN UNINTERRUPTED PROCESS
The Output Relays are operational (can be closed/opened) while the 850 Feeder Protection
System
is In-Service. If the relay goes into “Out-of-Service” mode, the status of all
previously energized output relays changes to de-energized. If an output relay was used to
maintain a running process, or to hold a motor contactor while energized, the process or
the motor contactor will be interrupted. To keep the process uninterrupted, the following
connection scheme can be applied:
Place selected Assigned/Non-assigned
Output Relays
Available/Hidden
Output Relays in:
Setpoints > Protection > Control >
Monitoring Elements
BKR [1-3] Trip Relay Select
BKR [1-3] Close Relay Select
SW [1-9] Open Relay Select
SW [1-9] Close Relay Select
Other Auxiliary Relays
Available
Hidden
Hidden
Hidden
Available
Output Relays in Control Elements with
Restoration Ability
BKR [1-3] Trip Relay Select
BKR [1-3] Close Relay Select
SW [1-9] Close Relay Select
SW [1-9] Open Relay Select
Other Auxiliary Relays
NOTE: The elements producing
close commands are directly
linked to their respective
breakers for closing/restoring.
Hidden
Hidden
Hidden
Hidden
Available
Setpoints > System > Switch [X] > Open
Relay Select
BKR [1-3] Trip Relay Select
BKR [1-3] Close Relay Select
SW [1-9] Close Relay Select
Other Auxiliary Relays
Hidden
Hidden
Hidden
Available
Setpoints > System > Switch [X] > Close
Relay Select
BKR [1-3] Trip Relay Select
BKR [1-3] Close Relay Select
SW [1-9] Open Relay Select
Other Auxiliary Relays
Hidden
Hidden
Hidden
Available
Setpoints > System > Breaker [X] > Trip
Relay Select
BKR [1-3] Close Relay Select
SW [1-9] Open Relay Select
SW [1-9] Close Relay Select
Other Auxiliary Relays
Hidden
Hidden
Hidden
Available
Setpoints > System > Breaker [X] > Close
Relay Select
BKR [1-3] Trip Relay Select
SW [1-9] Open Relay Select
SW [1-9] Close Relay Select
Other Auxiliary Relays
Hidden
Hidden
Hidden
Available