Completing The Test; Check Of Trip Circuits And Circuit Breakers; Current Protection; Directional Phase Overcurrent Protection, Four Steps Oc4Ptoc (51_67) - ABB Relion 670 Series Commissioning Manual

Section 10
Testing functionality by secondary injection
5. Make sure there is enough current for slow open CT algorithm to operate, when the current is
disconnected later during testing, by checking that the value of the product 0.15 × I2 × CTprim1 is
bigger than the value of OCTOperLev. If not, increase the current into CT1 input until this condition
is satisfied and change the current into input CTx accordingly.
6. Set the phase angle of the current I2, as explained in the previous sections.
7. Inject these two currents into the IED. Observe that the differential function shall be stable. Write
down the service values for incoming and differential currents for the phase A. Observe that the
differential current should be approximately 15% of the incoming current.
8. After pre-set time determined by parameter tSlow OCT, open CT condition shall be detected by the
IED. The differential function behavior shall be in accordance with the set value of the parameter
SlowOCTOper.
9. Check that open CT alarm contacts operate accordingly to the scheme wiring.
10. Check that open CT information is stored in the event list (if connected).
11. Switch off the currents.
12. Reset the open CT blocking in the reset menu of the local HMI.
13. Check that open CT reset information is stored in the event list (if connected).
14. Repeat the same test procedure for the phases B and C.
10.3.1.6

Completing the test

Continue to test another function or end the test. Restore connections and settings to their original
values, if they were changed for testing purposes.
10.3.1.7

Check of trip circuits and circuit breakers

The trip circuits are tested as part of the secondary/primary injection test.
Check that the circuit breakers associated with the IED protection scheme operate when the tripping
outputs from the IEDs are activated. The trip outputs from the IEDs are conveniently activated by
secondary injection to activate a suitable protection function. Alternatively Forcing of Binary Output
Contacts from the IED under the Test Mode can be used.
10.4

Current protection

10.4.1 Directional phase overcurrent protection, four steps OC4PTOC
(51_67)
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for OC4PTOC 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.
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