Status Indicators; Description; System Status Indicators; Settings - GE 750 Instruction Manual

5.2 STATUS INDICATORS

5.2 STATUS INDICATORS
The front panel indicators are grouped into three columns. The 750/760 STATUS column indicates the state of
the relay, the SYSTEM STATUS column indicates the state of the breaker and the system, and the OUTPUT
STATUS column indicates the state of the output relays. These LED indicators can be tested by pressing
when no trips or alarms are active. As shown below, the color of each indicator conveys its importance.
N E X T
G = Green
A = Amber
R = Red
RELAY IN SERVICE : This indicator will be on continuously if the relay is functioning normally and no major
self-test errors have been detected. During operation the relay continuously performs various self tests and if a
major self-test fails, the indicator will be turned off, all output relays will be de-energized, and the 8 SELF-TEST
WARNING status indicator will be turned on. This indicates a complete loss of protection. See the self-test
warning section later in this chapter.
TRIP : This indicator flashes when the relay detects a trip condition and operates the 1 TRIP relay to open the
breaker. After the initiating fault has been cleared, this LED can be turned off with a reset.
ALARM : While the relay is detecting an alarm condition, this indicator will flash. Even if latched output relays
are programmed to operate with the alarm, the indicator will automatically turn off if the alarm condition clears.
Such output relays will remain in the operated state until a reset is performed.
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Note: Latched Alarm – While the relay is detecting an alarm condition, this indicator will flash. After
the alarm condition clears, the indicator remains illuminated and can be turned off with a reset.
PICKUP : For the purpose of testing and calibration verification, this indicator will light steady when any protec-
tion feature has its pickup threshold exceeded. Eventually, if the fault condition persists, a trip will be issued by
the relay. If the measured parameter drops below its pickup level, the indicator will turn off.
SETPOINT GROUP 1-4 : These indicators are flashing if the corresponding group is selected for editing and/or
display; they are continuously on if the corresponding group is providing settings for the protection elements.
THE OPEN AND CLOSED STATUS INDICATOR COLORS ARE INTERCHANGEABLE AT THE
TIME OF PLACING A 750/760 ORDER.
NOTE
BREAKER OPEN : When the breaker is open, this indicator will be on continuously.
BREAKER CLOSED : When the breaker is closed, this indicator will be on continuously.
Breaker status indication is based on the breaker 52a and 52b contacts. With both contacts wired to the relay,
the closed status is determined by a closed 52a contact and the open status is determined by a closed 52b
contact. If both 52a and 52b contacts are open, due to a breaker being racked out of the switchgear, both the
BREAKER OPEN and BREAKER CLOSED indicators will be off.
With a single 52a contact, it is impossible to distinguish between a breaker open state and a racked out
breaker. In both situations, the 52a contact will be open. With a single 52b contact, you cannot distinguish
between a breaker closed state and a racked out breaker. Likewise, the 52b contact will be open for both situ-
ations. To clarify this ambiguity, the breaker connected function should be programmed to an additional logic
input. When this additional input is closed, a single 52a or 52b contact will show both breaker states. When the
breaker is racked out, this additional breaker connected input should be open. In this case, both breaker status
indicators will be off.
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Courtesy of NationalSwitchgear.com
General Condition
Alert Condition
Serious Alarm or Important Status
750/760 Feeder Management Relay
5 FRONT PANEL OPERATION

5.2.1 DESCRIPTION

5.2.2 750/760 STATUS INDICATORS

5.2.3 SYSTEM STATUS INDICATORS

GE Power Management