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10.2.6.3
Blocking
M14958-13 v7
It is possible to block overfrequency protection SAPTOF partially or completely,
by binary input signals or by parameter settings, where:
BLOCK:
blocks the START and TRIP outputs
BLKTRIP:
blocks the TRIP output
If the measured voltage level decreases below the setting of
IntBlockLevel
, both the
START and the TRIP outputs are blocked.
10.2.6.4
Design
M14958-24 v9
The frequency measuring element continuously measures the frequency of the
positive sequence voltage and compares it to the setting
StartFrequency
. The
frequency signal is filtered to avoid transients due to switchings and faults in the
power system. The time integrator operates due to a definite delay time. The design
of overfrequency protection SAPTOF is schematically described in figure
.
Frequency
f > StartFrequency
Voltage
start
TRIP
U < IntBlockLevel
block
BLOCK
OR
Definite timer
tReset
tDelay
IEC16000042-1-en.vsdx
trip
START
BLKDMAGN
BLKTRIP
AND
Start
&
Trip
output
logic
IEC16000042 V1 EN-US
Figure 130:
Simplified logic diagram for SAPTOF
Section 10
1MRK 505 394-UEN A
Frequency protection
276
Line differential protection RED650 2.2 IEC
Technical manual
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