Identification - ABB RES670 Technical Manual

1MRK 511 408-UUS A
10.3.1
10.3.2
10.3.3
10.3.4
Phasor measurement unit RES670 2.2 ANSI
Technical manual

Identification

Function description
Rate-of-change of frequency protection
Functionality
The rate-of-change of frequency protection function (SAPFRC (81)) gives an early
indication of a main disturbance in the system. SAPFRC (81) measures frequency with
high accuracy, and can be used for generation shedding, load shedding and remedial
action schemes. SAPFRC (81) can discriminate between a positive or negative change
of frequency. A definite time delay is provided for trip.
SAPFRC (81) is provided with an undervoltage blocking. The operation is based on
positive sequence voltage measurement and requires two phase-phase or three phase-
neutral voltages to be connected. For information about how to connect analog inputs,
refer to Application manual/IED application/Analog inputs/Setting guidelines.
Function block
SAPFRC (81)
V3P* TRIP
BLOCK PICKUP
BLKTRIP RESTORE
BLKREST BLKDMAGN
ANSI06000281-2-en.vsd
ANSI06000281 V2 EN-US
Figure 109: SAPFRC (81) function block
Signals
Table 172: SAPFRC (81R) Input signals
Name Type
V3P GROUP
SIGNAL
BLOCK BOOLEAN
BLKTRIP BOOLEAN
BLKREST BOOLEAN
IEC 61850 IEC 60617
identification identification
SAPFRC
df/dt > <
SYMBOL-N V1 EN-US
Default Description
- Three phase group signal for voltage inputs
0 Block of function
0 Blocking operate output
0 Blocking restore output
Section 10
Frequency protection
ANSI/IEEE C37.2
device number
81
M14965-3 v13
PID-6754-INPUTSIGNALS v2
M14868-1 v4
M14968-3 v6
313