Generator; Running Hours - GE 889 Instruction Manual

CHAPTER 4: SETPOINTS

Generator

Running Hours

NOTE:
NOTE
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
The 889 can calculate/accumulate generator running hours, which may be of interest for
periodic maintenance. Since running hour calculations do not rely on external/special
input (Tachometer), it basically utilizes generator terminal voltage and frequency
measurement, and hence, Running hours is always available (as a generator metering
value). Running Hours are accumulated if the generator terminal positive sequence
voltage (Slot-J V1) is above 0.5 x VT and frequency is above 10 Hz. Initial running hours can
be added in case if generator has existing runtime value. In case if total running hours
exceed the use-setting limit, the function would alarm the condition.
Path:
Setpoints > Monitoring > Generator > Running Hours
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
INITIAL RUN HRS
Range: 0 to 999,999 hrs in steps of 1 hr
Default: 0 hrs
This setting allows the user to program existing accumulated running hours on the
generator the relay is protecting. In order to apply initial running hours, the current
generator running hours should be cleared to zero. Once applied, the running hours are
calculated starting from this initial value.
In order to apply the initial running hours, first clear the Running hours using Records >
Clear Records > Clear Running Hours. Upon execution of "Clear Running Hours"
command, the value set in this INITIAL RUN HRS will be initialized in the running hour
counter.
RUN HRS LIMIT
Range: 1 to 1000,000 hrs in steps of 1 hr
Default: 1000 hrs
This setting specifies the maximum hours after which a Running Hour Alarm is
generated.
OUTPUT RELAY
Range: Do Not Operate, Operate
Default: Do Not Operate
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
EVENT
Range: Enabled, Disabled
Default: Disabled
TARGET
Range: Self-reset, Latched, DIsabled
Default: Self-reset
MONITORING
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