ABB Relion 650 Series Technical Manual page 268

Section 8
Frequency protection
8.2.8 Technical data
Table 197: SAPTOF (81) technical data
Function
Operate value, pickup function
Operate time, pickup function
Reset time, pickup function
Timer
8.3 Rate-of-change frequency protection SAPFRC (81)
8.3.1 Identification
Function description
Rate-of-change frequency protection
8.3.2 Functionality
Rate-of-change frequency protection function (SAPFRC,81) gives an early indication of a main
disturbance in the system. SAPFRC (81) can be used for generation shedding, load shedding and
remedial action schemes. SAPFRC (81) can discriminate between positive or negative change of
frequency.
SAPFRC (81) is provided with an undervoltage blocking.
8.3.3 Function block
V3P*
BLOCK
ANSI09000281 V1 EN-US
Figure 134: SAPFRC (81) function block
262
SAPFRC (81)
TRIP
PICKUP
RESTORE
BLKDMAGN
ANSI09000281-1-en.vsd
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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
Hz
At 50 and 60 Hz: 55 ms typically at f
+0.5 Hz to f -0.5 Hz
set
(0.000-60.000)s
IEC 61850 IEC 60617
identification identification
SAPFRC
df/dt > <
SYMBOL-N V1 EN-US
1MRK 506 326-UUS B
Accuracy
± 2.0 mHz at
symmetrical three-
phase voltage
-0.5 Hz to -
set
-0.5 Hz to f +0.5
set set
-
set
<250 ms
ANSI/IEEE C37.2
device number
81
Line distance protection REL650
Technical manual
M14964-1 v7
IP15748-1 v3
M14868-1 v3
M14965-3 v8
M14968-3 v6