Settings - ABB REG650 Technical Manual

Section 10
Frequency protection
10.2.5
Table 174: SAPTOF (81) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
PUFrequency 35.00 - 75.00
tDelay 0.000 - 60.000
10.2.6
10.2.7
10.2.7.1
296
Table 173: SAPTOF (81) Output signals
Name Type
TRIP BOOLEAN
BFI BOOLEAN
BLKDMAGN BOOLEAN

Settings

Unit Step
- -
Hz 0.01
s 0.001
Monitored data
Table 175: SAPTOF (81) Monitored data
Name Type
FREQ REAL
Operation principle
Overfrequency protection SAPTOF (81) is used to detect high power system
frequency. SAPTOF (81) has a settable definite time delay. If the frequency remains
above the set value for a time period greater than the set time delay the TRIP signal is
issued. To avoid an unwanted TRIP due to uncertain frequency measurement at low
voltage magnitude, a voltage controlled blocking of the function is available from the
preprocessing function, that is, if the voltage is lower than the set blocking voltage in
the preprocessing function, the function is blocked and no PICKUP or TRIP signal is
issued.
Measurement principle
The frequency measuring element continuously measures the frequency of the positive
sequence voltage and compares it to the setting PUFrequency. The frequency signal is
filtered to avoid transients due to switchings and faults in the power system. If the
voltage magnitude decreases below the setting MinValFreqMeas in the SMAI
Description
Common trip signal
General pickup signal
Measurement blocked due to low amplitude
Default Description
Disabled Operation Disable / Enable
51.20 Frequency set value
0.200 Operate time delay
Values (Range) Unit
- Hz
1MRK 502 043-UUS B
Description
Measured frequency
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