GE Multilin 850

CHAPTER 4: SETPOINTS OUTPUTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–97
Outputs
Figure 4-34: Outputs Display Hierarchy
Output Relays
The 850 Feeder Protection System relay is equipped with a number of electromechanical
output relays specified at the time of ordering. The I/O module from slot F, for example,
provides five output relays.
The first output relay (Relay 1) in the 850 is a Form A relay that can be used for Trip Coil
monitoring, and is designated for tripping the breakerswitching device. The relay is
energized upon operation of any element with setpoint Function set to "Trip". The relay can
be customized by changing the name and type, and adding triggers or blocking, as shown
in the Output Relay setpoint descriptions. Output Relay 1 is programmed internally for
tripping the breakerswitching device, and it cannot be changed, disabled, or replaced by
any other relay. Additional output relays can be selected to operate as well from the menu
of each protection, control, or monitoring element.
Output Relay 2 is a Form A relay that can be used for Close Coil monitoring, and it is
selected as the default for closing the breakerswitching device. The 850
provides a
selection of any available output relay for closing the breakerswitching device under the
BreakerContactor > Close Relay Select setpoint The output relay selected for closing the
breakerswitching device can be triggered directly from some relay functions designated to
perform the breakerswitching device close action. If Relay 2 is not selected as the Close
relay, it can be used for other purposes. The "Trip" and "Close" relays have fixed operating
logic as they depend on breakerswitching device feedback for resetting.
The Trip and Close auxiliary relays follow the respective Trip and Close logic, meaning they
will have fixed operating characteristics as they depend on breaker feedback for resetting.
The auxiliary relays selected for breaker tripping are also available for selection from the
menus of all protection elements. The auxiliary relays selected for breaker closing are
excluded from the list for selection from the menu of all elements. Refer to the Breaker
setup section on how to select an auxiliary relay for breaker trip and close.