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
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. 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
(51_67)
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings".
Values of the logical signals for D2PTOC 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
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
A and neutral.
If 2 out of 3 currents are chosen for operation: Connect the injection current into
phase A and out from phase B.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
178 Transformer protection RET670 2.2 ANSI
Commissioning manual
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