Observe: Do not exceed the maximum permitted overloading
of the current circuits in the IED.
5. Compare the measured operating current with the set value.
6. Set the operation mode to 2 out of 3
and inject current into one of the phases
and then check that no TRLn signal appears.
11.5.1.2 Completing the test
M11754-24 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.
11.5.2 Directional phase overcurrent protection, four steps
OC4PTOC
SEMOD56287-67 v9
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
Values of the logical signals for OC4PT
OC are available on the local HMI under
Main menu/Tests/Function status/Current protection/
PhaseOverCurrent4Step(51_67,4(3I>))/OC4PTOC(51_67;4(3I>)):x, where x =
instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
11.5.2.1 Verifying the settings
SEMOD56287-72 v10
The verification of the non-directional phase overcurrent function is
done as instructed below, but without applying any polarizing
voltage.
1.
Connect the test set for current injection to the appropriate IED phases.
If there is any configuration logic that is used to enable or block any of the
four available overcurrent steps, make sure that the step under test is enabled
(for example, end fault protection).
If 1 out of 3 currents are chosen for operation: Connect the injection current
to phases L1 and neutral.
If 2 out of 3 currents are chosen for operation: Connect the injection current
into phase L1 and out from phase L2.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
172 Line differential protection RED670 2.2 IEC
Commissioning manual
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