ABB REL650 User Manual

Function Range or value Accuracy
Reset time, definite time function at f
set
- 0.02 Hz to
f
set
+ 0.02 Hz
(0.000-60.000)s ±0.2% or
±120 ms
whichever
is greater
Voltage dependent time delay
Settings:
UNom=(50-150)% of U
base
UMin=(50-150)% of U
base
Exponent=0.0-5.0
tMax=(0.010–60.000)s
tMin=(0.010–60.000)s
±1.0% or
±100 ms
whichever
is greater
( )
Exponent
U UMin
t tMax tMin tMin
UNom UMin
-
= × - +
-
é ù
ê ú
ë û
EQUATION1182 V1 EN-US (Equation 55)
U=U
measured
9.2 Overfrequency protection SAPTOF
IP15747-1 v3
9.2.1 Identification
M14866-1 v4
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection SAPTOF
f >
SYMBOL-O V1 EN-US
81
9.2.2 Functionality
M14953-3 v12
Overfrequency protection function (SAPTOF) is applicable in all situations, where
reliable detection of high fundamental power system frequency is needed.
Overfrequency occurs because of sudden load drops or shunt faults in the power
network. Close to the generating plant, generator governor problems can also cause
over frequency.
SAPTOF measures frequency with high accuracy, and is used mainly for
generation shedding and remedial action schemes. It is also used as a frequency
stage initiating load restoring. A definite time delay is provided for operate.
SAPTOF 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
1MRK 506 382-UEN A Section 9
Frequency protection
Line distance protection REL650 2.2 IEC 305
Technical manual

ABB REL650 Specifications

General

Brand	ABB
Model	REL650
Category	Protection Device
Language	English