• Phase-to-ground fault
Ensure that the maximum continuous current, supplied from the current source used for
the test of the IED, does not exceed four times the rated current value of the IED.
6.3.5.1 Measuring the operate limit of set values
1. Inject a phase current into the IED with an initial value below that of the setting.
2. Increase the injected current in the Ln or in the neutral (summated current input)
phase until the TRIP signal appears.
3. Disable the fault current
Observe to not exceed the maximum permitted overloading of the current circuits in
the IED
4. Compare the measured operating current with the set value.
6.3.5.2 Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is
tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Current/EFPIOC(50N,IN>>)/EFPIOC:1 for the function, or for each
individual function in a chain, to be tested next. Remember to set the parameter Blocked to
Yes, for each individual function that has been tested.
6.3.6 Four step residual overcurrent protection, zero or negative
sequence direction EF4PTOC (51N/67N)
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to verify
settings".
Values of the logical signals for EF4PTOC (51N67N) are available on the local HMI
under Main menu/Tests/Function status/Current/EF4PTOC(51N67N,4IN>)/
EF4PTOC:X. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
6.3.6.1 Four step directional residual overcurrent protection
1. Connect the test set for single current injection to the appropriate IED terminals.
1MRK 505 293-UUS A Section 6
Testing functionality
51
Commissioning manual
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