Design; Technical Data - ABB REG650 Technical Manual

1MRK 502 034-UEN -
9.3.6.3
BLOCK
freqNotValid
Rate-of-Change
of Frequency
Frequency
IEC08000009 V1 EN
Figure 136: Schematic design of Rate-of-change frequency protection SAPFRC
9.3.7
Technical Manual

Design

Comparator
If
[StartFreqGrad<0
START
AND
df/dt < StartFreqGrad]
OR
[StartFreqGrad>0
AND
df/dt > StartFreqGrad]
Then
START
Comparator
f > RestoreFreq

Technical data

Table 169: SAPFRC technical data
Function
Operate value, start function
Operate value, restore
enable frequency
Timers
Operate time, start function
BLOCK
OR
Definite Time Delay
tTrip
tRestore
Range or value
(-10.00-10.00) Hz/s
(45.00 - 65.00) Hz
(0.000 - 60.000) s
At 50 Hz: 100 ms typically
At 60 Hz: 80 ms typically
Section 9
Frequency protection
BLKDMAGN
Start
&
Trip
Output
Logic
100 ms
RESTORE
IEC08000009_en_1.vsd
Accuracy
± 10.0 mHz/s
± 2.0 mHz
<130 ms
-
START
TRIP
265