GE Multilin 850 Instruction Manual page 85

CHAPTER 3: INTERFACES
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 3-9: Typical LED Indicator Panel
Some status indicators are common while some are feature specific which depend on the
availability in the order code. The common status indicators in the first column are
described below.
• IN SERVICE
– Green color = Relay powered up, passed self-test has been programmed, and
ready to serve. This LED indicates that control power is applied, all monitored
inputs, outputs, and internal systems are OK, and that the device has been
programmed.
– Red color = Relay failed self test, has not been programmed, or out of service
• TRIP
This LED indicates that the element selected to produce a trip has operated. This
indicator always latches; as such, a Reset command must be initiated to allow the
latch to be reset.
• ALARM
This LED indicates that the FlexLogic™ operand serving as an Alarm switch has
operated. Latching of the indicator depends on the selected protection function. A
Reset command must be initiated to allow the latch to be reset.
• PICKUP
This LED indicates that at least one element is picked up. This indicator is never
latched.
• TEST MODE
This LED indicates that the relay has been set into Test Mode.
• MESSAGE
This LED indicates the presence of Target Messages detected by the relay.
• LOCAL MODE
This LED indicates that the relay is operating in local mode.
Breaker status indication is based on the breaker's 52a and 52b contacts. With both
contacts wired to the relay and configured, closed breaker status is determined by closed
52a contact and opened 52b contact. Vice-versa the open breaker status is determined by
opened 52a contact and closed 52b contact. If both 52a and 52b contacts are open, due to
a breaker being racked out from the switchgear, both the Breaker Open and Breaker
Closed LED Indicators will be off.
The Event Cause indicators in the first column are described as follows:
Events Cause LEDs are turned ON or OFF by protection elements that have their respective
target settings selected as either "Self-Reset" or "Latched". If a protection element target
setting is "Self-Reset", then the corresponding Event Cause LEDs remain ON as long as the
operate operand associated with the element remains asserted. If a protection element
target setting is "Latched", then the corresponding Event Cause LEDs turn ON when the
operate operand associated with the element is asserted and will remain ON until the
RESET button on the front panel is pressed after the operand is reset.
BKR OPEN
IN SERVICE
TRIP BKR CLOSED
ALARM
SYNCHECK OK
PICK UP
AR ENABLED
TEST MODE
AR IN PROGRESS
MESSAGE
LOCAL MODE AR LOCKOUT
FRONT CONTROL PANEL INTERFACE
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