Blocking; Design; Technical Data; Overfrequency Protection Saptof - ABB REC650 Technical Manual

Section 8
Frequency protection
8.1.7.3
8.1.7.4
8.1.8
8.2
182
When the measured frequency returns to the level corresponding to the setting
RestoreFreq, a 100ms pulse is given on the output RESTORE after a settable time
delay (tRestore).

Blocking

It is possible to block underfrequency protection SAPTUF completely, by binary
input signal:
BLOCK: blocks all outputs
If the measured voltage level decreases below the setting of MinValFreqMeas in the
preprocessing function both the START and the TRIP outputs are blocked.

Design

The design of underfrequency protection SAPTUF is schematically described in
figure 79.
Figure 80: Simplified logic diagram for SAPTUF

Technical data

Table 139: SAPTUF Technical data
Function
Operate value, start function
Operate value, restore
frequency
Reset ratio
Operate time, start function
Reset time, start function
Operate time delay
Restore time delay

Overfrequency protection SAPTOF

Range or value
(35.00-75.00) Hz
(45 - 65) Hz
<1.001
At 50 Hz: 200 ms typically at f
-0.5 Hz
At 60 Hz: 170 ms typically at f
-0.5 Hz
At 50 Hz: 60 ms typically at f
+0.5 Hz
At 60 Hz: 50 ms typically at f
+0.5 Hz
(0.000-60.000)s
(0.000-60.000)s
1MRK 511 287-UEN A
Accuracy
± 2.0 mHz at
symmetrical three-
phase voltage
± 2.0 mHz
-
+0.5 Hz to f -
set set
+0.5 Hz to f
set set
-0.5 Hz to f -
set set
-0.5 Hz to f
set set
<250 ms
<150 ms
Technical manual