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1MRK 505 372-UEN Rev. K
10.6.3.1
Verifying the settings
Verification of START value and time delay to operate
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
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.
10.6.3.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
10.7
Multipurpose protection
10.7.1
Function revision history
Document
revision
A
B
C
D
E
F
G
H
J
Busbar protection REB670
Commissioning manual
Product
History
revision
2.2.1
-
2.2.1
-
2.2.2
-
2.2.3
-
2.2.3
-
2.2.4
-
2.2.4
-
2.2.4
-
2.2.5
•
The harmonic restraint function changed to freeze the definite and IDMT timers.
•
The maximum value of the settings IMin1 and IMin2 has been decreased to 1000.0
% of IBase.
•
Setting BlkLevel2nd was removed from the function.
•
Previously called stepwise settings t_DefOCx and tResetDef_OCx had their names
changed to t_OCx and tReset_OCx for more clear understanding.
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Section 10
Testing functionality by secondary injection
SEMOD53552-1 v1
GUID-74F9B9A9-91EB-45BA-A883-6BA325C8B272 v1
M16256-8 v1
M16256-10 v5
M16256-29 v4
M16256-39 v4
109
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