ABB Relion 670 Series RES670, Technical Manual

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Function Range or value Accuracy
Reset time, pickup at f
set
+0.02 Hz
to f
set
-0.02 Hz
Min. = 15 ms
Max. = 30 ms
-
Trip time, definite time function at
f
set
-0.02 Hz to f
set
+0.02 Hz
(0.000-60.000)s ±0.2% ±100 ms
whichever is greater
Reset time, definite time function
at f
set
+0.02 Hz to f
set
-0.02 Hz
(0.000-60.000)s ±0.2% ±120 ms,
whichever is greater
10.3 Rate-of-change frequency protection SAPFRC (81)
10.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Rate-of-change frequency protection SAPFRC
df/dt
><
SYMBOL-N V1 EN
81
10.3.2 Functionality
The rate-of-change 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 .
Section 10
1MRK 511 365-UUS A
Frequency protection
308 Phasor measurement unit RES670 2.1 ANSI
Technical manual