5.
Slowly increase the frequency of the applied voltage, to a value above
StartFrequency
.
6.
Check that the START signal does not appear.
7.
Wait for a time corresponding to
tDelay
, make sure that the TRIP signal does
not appear.
10.6.2.2
Completing the test
M16290-52 v5
Continue to test another function or end the test by changing the
TESTMODE
setting to
Off
. Restore connections and settings to their original values, if they were
changed for testing purposes.
10.6.3
Rate-of-change frequency protection SAPFRC
M16256-2 v6
Prepare the IED for verification of settings outlined in Section
10.6.3.1
Verifying the settings
M16256-8 v1
Verification of START value and time delay to operate
M16256-10 v5
1.
Check that the settings in the IED are appropriate, especially the START
value and the definite time delay. Set
StartFreqGrad
, to a rather small
negative value.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly decrease the frequency of the applied voltage, with an increasing rate-
of-change that finally exceeds the setting of
StartFreqGrad
, and check that
the START signal appears.
4.
Note the operate value and compare it with the set value.
5.
Increase the frequency to rated operating conditions, and zero rate-of-change.
6.
Check that the START signal resets.
7.
Instantaneously decrease the frequency of the applied voltage to a value about
20% lower than the nominal value.
8.
Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
M16256-29 v4
1.
The test above can be repeated to check a positive setting of
StartFreqGrad
.
2.
The tests above can be repeated to check the time to reset.
3.
The tests above can be repeated to test the RESTORE signal, when the
frequency recovers from a low value.
Section 10
1MRK 505 372-UEN A
Testing functionality by secondary injection
124
Busbar protection REB670 2.2 IEC
Commissioning manual
