ABB RELION Series, Technical Manual

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Parameter Values (Range) Unit Step Default Description
Start value df/dt -0.200...-0.005 xFn /s 0.005 -0.010 Setting of frequency gradient for df/dt
detection
Operate Tm Freq 80...200000 ms 10 200 Time delay to operate for under frequency
stage
Operate Tm df/dt 120...200000 ms 10 200 Time delay to operate for df/dt stage
Restore start Val 0.800...1.200 xFn 0.001 0.998 Restore frequency setting value
Restore delay time 80...200000 ms 10 300 Time delay to restore
Table 473: LSHDPFRQ Non group settings (Basic)
Parameter Values (Range) Unit Step Default Description
Operation 1=on
5=off
1=on Operation Off / On
Table 474: LSHDPFRQ Non group settings (Advanced)
Parameter Values (Range) Unit Step Default Description
Reset delay time 0...60000 ms 1 50 Time delay after which the definite timers
will reset
4.5.2.8 Monitored data
Table 475: LSHDPFRQ Monitored data
Name Type Values (Range) Unit Description
START_DUR FLOAT32 0.00...100.00 % Start duration
LSHDPFRQ Enum 1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.5.2.9 Technical data
Table 476: LSHDPFRQ Technical data
Characteristic Value
Operation accuracy f< ±5 mHz
df/dt ±100 mHz/s (in range |df/dt| < 5 Hz/s)
± 2.0% of the set value (in range 5 Hz/s < |df/dt| <
15 Hz/s)
Start time f< <80 ms
df/dt <120 ms
Reset time <150 ms
Operate time accuracy ±1.0% of the set value or ±30 ms
Section 4
1MRS758755 A
Protection functions
452 REC615 and RER615
Technical Manual