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1MRK 505 378-UEN Rev. K
4.
Overall check in principal as above (non-directional overcurrent feature)
5.
Reverse the direction of the injection current and check that the protection does not operate.
6.
Check with low polarization voltage that the feature becomes non-directional, blocked or with
memory according to the setting.
11.8.2.5
Over/Undervoltage feature
Procedure
1.
Connect the test set for injection three-phase voltages to the appropriate voltage terminals of
the IED.
2.
Inject voltage(s) in a way that relevant measured (according to setting parameter VoltageInput)
voltages are created from the test set.
3.
Overall check in principal as above (non-directional overcurrent feature) and correspondingly
for the undervoltage feature.
11.8.2.6
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.
11.9
Secondary system supervision
11.9.1
Current circuit supervision CCSSPVC
Prepare the IED for verification of settings outlined in Section
The Current circuit supervision function CCSSPVC is conveniently tested with the same three-phase
test set as used when testing the measuring functions in the IED.
The condition for this procedure is that the setting of IMinOp is lower than the setting of Ip>Block.
11.9.1.1
Verifying the settings
1.
Check the input circuits and the operate value of the IMinOp current level detector by injecting
current, one phase at a time.
2.
Check the phase current blocking function for all three phases by injecting current, one phase
at a time. The output signals shall reset with a delay of 1 second when the current exceeds 1.5
· IBase.
3.
Inject a current 0.1 · IBase to the reference current input I5.
4.
Increase slowly the current in one of the phases and check that FAIL output is obtained when
the current is above 0.9 · IBase.
11.9.1.2
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.
11.9.2
Fuse failure supervision FUFSPVC
Prepare the IED for verification of settings as outlined in section
section
Line differential protection RED670
Commissioning manual
"Preparing for test"
in this chapter.
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Testing functionality by secondary injection
"Preparing the IED to verify
"Requirements"
and
Section 11
SEMOD56488-83 v2
SEMOD56488-99 v2
SEMOD53556-1 v1
M12917-25 v8
settings".
M12917-31 v8
M12917-43 v4
M1405-2 v8
197
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