BLOCK:
blocks the START and TRIP 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.
10.3.6.4
Design
M14970-34 v7
Rate-of-change frequency protection (SAPFRC, 81) measuring element continuously
measures the frequency of the selected voltage and compares it to the setting
PUFreqGrad
. The frequency signal is filtered to avoid transients due to power system
switchings and faults. The time integrator operates with a definite delay time. When
the frequency has returned back to the setting of
RestoreFreq
, the RESTORE output is
issued after the time delay
tRestore
, if the TRIP signal has earlier been issued. The sign
of the setting
PUFreqGrad
is essential, and controls if the function is used for raising
or lowering frequency conditions. The design of SAPFRC (81) is schematically
described in figure
.
Section 10
1MRK 511 408-UUS A
Frequency protection
316
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Summary of Contents for Relion RES670
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