Settings - ABB RES670 Technical Manual

Section 10
Frequency protection
10.2.5
Table 169: SAPTOF (81H) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
PUFrequency 35.00 - 90.00
IntBlockLevel 0.0 - 100.0
tDelay 0.000 - 60.000
tReset 0.000 - 60.000
Table 170: SAPTOF (81H) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 12
10.2.6
10.2.6.1
310

Settings

Unit Step
- -
Hz 0.01
%VB 1.0
s 0.001
s 0.001
Unit Step
- 1
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, that is, if the voltage is lower than the set blocking voltage
IntBlockLevel, the function is blocked and no PICKUP or TRIP signal is issued.
Measurement principle
The fundamental frequency of the positive sequence voltage is measured continuously,
and compared with the set value, PUFrequency. Overfrequency protection SAPTOF
(81) is dependent on the voltage magnitude. If the voltage magnitude decreases below
the setting IntBlockLevel, SAPTOF (81) is blocked and the output BLKDMAGN is
issued. All voltage settings are made in percent of the VBase, which should be set as a
phase-phase voltage in kV. To avoid oscillations of the output PICKUP signal, a
hysteresis has been included.
Default Description
Disabled Operation Disabled/Enabled
51.20 Frequency set value
50.0 Internal blocking level in % of VBase
0.000 Operate time delay
0.000 Time delay for reset
Default Description
1 Selection of one of the Global Base Value
groups
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
PID-6751-SETTINGS v2
M14958-3 v7
M14958-6 v9
Technical manual