Technical Data; Rate-Of-Change Frequency Protection Sapfrc; Identification; Functionality - ABB REG650 Technical Manual

Section 9
Frequency protection
9.2.8
9.3
9.3.1
9.3.2
9.3.3
262

Technical data

Table 165: SAPTOF technical data
Function
Operate value, start function
Operate time, start function
Reset time, start function
Timer

Rate-of-change frequency protection SAPFRC

Identification

Function description
Rate-of-change frequency protection

Functionality

Rate-of-change frequency protection function (SAPFRC) gives an early indication
of a main disturbance in the system. SAPFRC can be used for generation shedding,
load shedding and remedial action schemes. SAPFRC can discriminate between
positive or negative change of frequency.
SAPFRC is provided with an undervoltage blocking.

Function block

SAPFRC
U3P* TRIP
BLOCK START
RESTORE
BLKDMAGN
IEC09000281_1_en.vsd
IEC09000281 V1 EN
Figure 135: SAPFRC function block
Range or value
(35.00-75.00) Hz
At 50 Hz: 200 ms typically at f
f +0.5 Hz
set
At 60 Hz: 170 ms at f -0.5 Hz to f
set
At 50 and 60 Hz: 55 ms typically at f
Hz to f -0.5 Hz
set
(0.000-60.000)s
IEC 61850
identification
SAPFRC
1MRK 502 034-UEN -
Accuracy
± 2.0 mHz at
symmetrical three-
phase voltage
-0.5 Hz to -
set
+0.5 Hz
set
+0.5 -
set
<250 ms
IEC 60617 ANSI/IEEE C37.2
identification device number
81
df/dt > <
SYMBOL-N V1 EN
Technical Manual