6. If the test has been performed by injection of current in phase A, repeat the test when
injecting current into phases B and C with polarizing voltage connected to phases B
respectively C (1 of 3 currents for operation).
7. If the test has been performed by injection of current in phases AB, repeat the test
when injecting current into phases BC and CA with appropriate phase angle of
injected currents.
8. Block higher set stages when testing lower set stages according to below.
9. Connect a trip output contact to a timer.
10. Set the injected current to 200% of the operate level of the tested stage, switch on the
current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the
operate current for tnMin.
11. Check that all trip and pickup contacts operate according to the configuration (signal
matrixes).
12. Reverse the direction of the injected current and check that the protection does not
operate.
13. Repeat the above-described tests for the higher set stages.
14. Finally check that pickup and trip information is stored in the event menu.
Check of the non-directional phase over-current function. This is done in
principle as instructed above, without applying any polarizing voltage.
6.3.4.2 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/OC4SPTOC(51_67,4I>)/OC4SPTOC: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.
6.3.5 Instantaneous residual overcurrent protection EFPIOC (50N)
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to verify
settings".
Values of the logical signals for EFPIOC (50N) are available on the local HMI under
Main menu/Tests/Function status/Current/EFPIOC(50N,IN>>)/EFPIOC:1. The
Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
To verify the settings the following fault type should be tested:
Section 6 1MRK 505 293-UUS A
Testing functionality
50
Commissioning manual
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