CHAPTER 6: METERING GENERATOR
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–7
Frequency OOB Accumulation
The Frequency Out-Of-Band (OOB) Accumulation feature provides diagnostic information
and alarms based on the accumulated off-nominal (out-of-band) frequency operation time
of a turbine over several frequency bands. Details of the feature settings can be found
under Path:
Setpoints > Monitoring > Generator > Frequency OOB Accumulation > General
NOTE:
The following screen is only displayed if Setpoints \ Monitoring \Generator \ Freq OOB
Accum \ Accum 1 \ Function is not set to “Disabled”.
Path: Setpoints > Metering > Generator > Frequency OOB Accumulation
FREQ OOB 1(7) ACCUM
Range: 0 to 100 % in steps of 0.1 %
For configured accumulators, this value displays to the nearest 0.1% the ratio of present
accumulation to the TIME LIMIT set for the accumulator.
Stator Ground 3rd Harmonic
NOTE:
The following screen is only displayed if Setpoints \ Protection \ Group 1 \ Generator \
3rd Harm Neutral UV [Trip or Alarm] Function or Setpoints \ Protection \ Group 1 \
Generator \ 3rd Harm Voltage Difference \ [Trip or Alarm] Function is not set to
“Disabled”.
Path: Metering > Generator > Stat Gnd 3rd Harm
3rd Harm VN in Sec
Range: 0.00 to 99.99 V in steps of 0.01 V
Default: 0.00 V
This value represents the magnitude of the 3rd harmonic component of neutral voltage
connected via an auxiliary voltage channel of the relay Ax VT Bnk1-J2 bank input.
3rd Harm VO in Sec
Range: 0.00 to 99.99 V in steps of 0.01 V
Default: 0.00 V
This value represents the magnitude of the 3rd harmonic in the zero-sequence voltage
at the generator output terminals.
3rd Harm VN+V0 in Sec
Range: 0.00 to 99.99 V in steps of 0.01 V
Default: 0.00 V
This value represents the vectorial sum of the ‘3rd Harm VN in Sec’ and ‘3rd Harm V0 in
Sec’.
NOTE:
“Sec” in metering values: “3rd Harm VN in Sec”, “3rd Harm V0 in Sec” and “3rd Harm VN+V0
in Sec” specifies the secondary voltage quantity.
To Next Page
Loading...
