ABB REG670 - Overfrequency Protection SAPTOF

RestoreFreq, the RESTORE output is issued after the time delay tRestore. The design
of underfrequency protection SAPTUF is schematically described in figure 264.
Frequency Comparator
f < StartFrequency
Voltage
START
START
TRIP
Comparator
MinValFreqMeas
BLOCK
Comparator
f > RestoreFreq
Block
OR
Time integrator
TimerOperation Mode
Selector
tDelay
tReset
tRestore
RESTORE
Start
&
Trip
Output
Logic
IEC05000726-2-en.vsdx
TRIP
BLKDMAGN
IEC05000726 V2 EN
Figure 264: Simplified logic diagram for SAPTUF
10.2 Overfrequency protection SAPTOF
10.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection SAPTOF
f >
SYMBOL-O V1 EN
81
Section 10 1MRK502052-UEN B
Frequency protection
548
Technical manual