ABB Relion 670 Series RES670, Technical Manual

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Table 169: SAPTOF (81H) Output signals
Name Type Description
TRIP BOOLEAN Common trip signal
PICKUP BOOLEAN Common pickup signal
BLKDMAGN BOOLEAN Measurement blocked due to low amplitude
FREQ REAL Measured frequency
10.2.5 Settings
Table 170: SAPTOF (81H) Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Operation Disabled/Enabled
PUFrequency 35.00 - 90.00 Hz 0.01 51.20 Frequency set value
tDelay 0.000 - 60.000 s 0.001 0.000 Operate time delay
tReset 0.000 - 60.000 s 0.001 0.000 Time delay for reset
Table 171: SAPTOF (81H) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
10.2.6 Monitored data
Table 172: SAPTOF (81H) Monitored data
Name Type Values (Range) Unit Description
VLevel REAL - kV Level of measured voltage
FREQ REAL - Hz Measured frequency
10.2.7 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 corresponding to the chosen time delay, the corresponding 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.
1MRK 511 365-UUS A
Section 10
Frequency protection
Phasor measurement unit RES670 2.1 ANSI 305
Technical manual