Voltage
START
START
TRIP
Start
&
Trip
Output
Logic
Time integrator
Definite Time Delay
TimeDlyOperate
TimeDlyReset
Comparator
U < IntBlockLevel
BLOCK
en05000735.vsd
Frequency
Comparator
f > StartFrequency
TRIP
BLKDMAGN
BLOCK
OR
BLKTRIP
IEC05000735 V1 EN
Figure 107:
Schematic design of overfrequency protection SAPTOF
10.2.8
Technical data
Table 163:
SAPTOF technical data
Function
Range or value
Accuracy
Operate value, start function
(35.00-75.00) Hz
± 2.0 mHz at
symmetrical three-
phase voltage
Reset ratio
>0.999
-
Operate time, start function
At 50 Hz: 200 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
At 60 Hz: 170 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
-
Reset time, start function
At 50 and 60 Hz: 55 ms typically at f
set
+0.5 Hz
to f
set
-0.5 Hz
-
Timer
(0.000-60.000)s
<250 ms
10.3
Rate-of-change frequency protection SAPFRC
Section 10
1MRK 504 135-UEN A
Frequency protection
238
Technical manual
Summary of Contents for ret650
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