GE 489 - Manual (Page 136)

5-4 489 Generator Management Relay GE Multilin
5.2 A1 STATUS 5 ACTUAL VALUES
5
Immediately prior to issuing a trip, the 489 takes a snapshot of generator parameters and stores them as pre-trip values;
this allows for troubleshooting after the trip occurs. The cause of last trip message is updated with the current trip and the
screen defaults to that message. All trip features are automatically logged as date and time stamped events as they occur.
This information can be cleared using the
S1 489 SETUP ÖØ CLEAR DATA ÖØ CLEAR LAST TRIP DATA setpoint. If the cause of
last trip is "No Trip To Date", the subsequent pretrip messages will not appear. Last Trip Data will not update if a digital input
programmed as Test Input is shorted.
5.2.3 ALARM STATUS
PATH: ACTUAL VALUES Ö A1 STATUS ÖØ ALARM STATUS
NEUTRAL VOLT (3rd)
PRETRIP: 0.0 V
Range: 0.0 to 25000.0 V
Seen only if there is a neutral voltage
transformer.
REAL POWER (MW)
PRETRIP: 0.000
Range: 0.000 to ±2000.000 MW
Not seen if VT CONNECTION is "None"
REACTIVE POWER Mvar
PRETRIP: 0.00 Hz
Range: 0.000 to ±2000.000 Mvar
Not seen if VT CONNECTION is "None"
APPARENT POWER MVA
PRETRIP: 0.00 Hz
Range: 0.000 to ±2000.000 MVA
Not seen if VT CONNECTION is "None"
HOTTEST STATOR RTD
RTD #1: 0°C PreTrip
Range: –50 to 250°C
Seen only if at least one RTD is "Stator"
HOTTEST BEARING RTD
RTD #7: 0°C PreTrip
Range: –50 to 250°C
Seen only if at least one RTD is "Bearing"
HOTTEST OTHER RTD
RTD #11: 0°C PreTrip
Range: –50 to 250°C
Seen only if at least one RTD is "Other"
AMBIENT RTD
RTD#12: 0°C PreTrip
Range: –50 to 250°C
Seen only if at least one RTD is Ambient
ANALOG INPUT 1
PreTrip: 0 Units
Range: –50000 to 50000
Not seen if VT CONNECTION is "None"
ANALOG INPUT 2
PreTrip: 0 Units
Range: –50000 to 50000
Not seen if VT CONNECTION is "None"
ANALOG INPUT 3
PreTrip: 0 Units
Range: –50000 to 50000
Not seen if VT CONNECTION is "None"
ANALOG INPUT 4
PreTrip: 0 Units
Range: –50000 to 50000
Not seen if VT CONNECTION is "None"
Vab/Iab PreTrip:
0.0
Ωsec.
0°
Range: 0 to 65535 Ωsec; 0 to 359°
Seen only if Loss of Excitation is enabled
„ ALARM STATUS
„ [ENTER] for more NO ALARMS
Range: N/A
Message seen when no alarms are active
Input A ALARM
STATUS: Active
Range: Active, Latched. The first line of this alarm
message reflects the Input Name as
programmed. Status is Active if the condition
that caused the alarm is still present
Input B ALARM
STATUS: Active
Range: see Input A ALARM STATUS
Input C ALARM
STATUS: Active
Range: see Input A ALARM STATUS
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE
ENTER
ESCAPE
р
р
MESSAGE
ESCAPE
MESSAGE
ESCAPE
MESSAGE
ESCAPE