ABB REC650 User Manual

8.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection SAPTOF
f >
SYMBOL-O V1 EN
81
8.2.2 Functionality
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.
8.2.3 Function block
SAPTOF
U3P*
BLOCK
TRIP
START
BLKDMAGN
IEC09000280_1_en.vsd
IEC09000280 V1 EN
Figure 81: SAPTOF function block
8.2.4 Signals
Table 140: SAPTOF Input signals
Name
Type Default Description
U3P GROUP
SIGNAL
- Three phase group signal for voltage inputs
BLOCK BOOLEAN 0 Block of function
1MRK 511 287-UEN A Section 8
Frequency protection
183
Technical manual

ABB REC650 Specifications

General

Brand	ABB
Model	REC650
Category	Control Unit
Language	English