9.2.6.3
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.
9.2.6.4
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 154:
Simplified logic diagram for SAPTOF
Section 9
1MRK 506 382-UEN A
Frequency protection
308
Line distance protection REL650 2.2 IEC
Technical manual
Summary of Contents for RELION 650 SERIES
Page 1: ...RELION 650 SERIES Line distance protection REL650 Version 2 2 Technical manual ...
Page 2: ......
Page 46: ...40 ...
Page 56: ...50 ...
Page 164: ...158 ...
Page 264: ...258 ...
Page 304: ...298 ...
Page 320: ...314 ...
Page 338: ...332 ...
Page 438: ...432 ...
Page 468: ...462 ...
Page 534: ...528 ...
Page 646: ...640 ...
Page 660: ...654 ...
Page 676: ...670 ...
Page 800: ...794 ...
Page 836: ...830 ...
Page 890: ...884 ...
Page 894: ...888 ...
Page 940: ...934 ...
Page 941: ...935 ...