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10.1.6.4
Blocking
M13354-50 v7
It is possible to block underfrequency protection SAPTUF (81) partially or completely,
by binary input signals or by parameter settings, where:
BLOCK:
blocks the START, TRIP and
RESTORE outputs
BLKTRIP:
blocks the TRIP output
BLKREST:
blocks the RESTORE output
If the measured voltage level decreases below the setting of
IntBlockLevel
, both the
PICKUP and the TRIP outputs are blocked.
10.1.6.5
Design
M13354-63 v10
The frequency measuring element continuously measures the frequency of the positive
sequence voltage and compares it to the setting
PUFrequency
. The frequency signal is
filtered to avoid transients due to switchings and faults. The time integrator can trip
either due to a definite delay time or to the special voltage dependent delay time. When
the frequency has returned back to the setting of
RestoreFreq
, the RESTORE output is
issued after the time delay
tRestore
. The design of underfrequency protection SAPTUF
(81) is schematically described in figure
.
Section 10
1MRK 511 408-UUS A
Frequency protection
306
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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