ABB Relion 670 Series Commissioning Manual page 78

Section 10
Testing functionality by secondary injection
REB 670
ANSI01000112-2 V1 EN-US
Figure 12:
The testing will be explained from one general current input CTx (that is 1 ≤ x ≤ Nmax; where Nmax is
the maximum number of used CT inputs).
Follow the following test instructions to test the operation of the differential protection function for the
current input CTx:
1. Connect the test set for injection of three-phase current (or if not available one-phase current) to
the current terminals of CTx input of REB670 terminal.
2. Check and write down the value for the configuration parameter CTprimx, which corresponds to the
rated primary current of the CTx input.
Test the operation of the differential protection function ZA
3. Make sure that the check zone is properly set and enabled, when used.
4. Make sure the current from this current input is included into ZA measurement.
Check the value for the configuration parameter ZoneSel of the CTx, and
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•
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5. Check the association status of each CT to the differential zones, from the local HMI (under Main
menu /Control/Station matrix ).
6. Increase the current in the phase A until the correct differential zone function (that is, either ZA or
ZB) operates and observe the incoming and differential currents at the moment of operation.
7. Check that the trip and alarm contacts operate according to the scheme wiring.
8. Check that the trip information is stored in the event list (if connected).
9. Switch off the current.
10. Check that the trip reset information is stored in the event list (if connected).
11. Check the function by injecting current in the phases B and C in the similar way.
12. Inject a symmetrical three-phase current and observe the trip value (possible with three-phase test
set only).
13. Connect the timer and set the current to be five times of the value for the parameter DiffOperLevel.
14. Switch on the current and observe the trip time.
Test the operation of the differential protection function ZB
15. Test the operation of both differential protection function ZA and ZB simultaneously
Check the value for the configuration parameter ZoneSel of the CTx, and
72
REB 670 REB 670
Typical test connection for CTx current input when test switch is delivered together
with one-phase REB670 IED
energize the binary input CTRLZA, if the value of ZoneSel is CtrlIncludes, or
de-energize the binary input CTRLZA, if the value of ZoneSel is CtrlExcludes, or
go to the next step, if the value of ZoneSel is Fixed to ZA, Fixed to ZB or Fixed to ZA & - ZB.
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1MRK 505 372-UUS Rev. K
3-Ph current
Test Set
A B C N
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en01000112_2_ansi.vsd
Busbar protection REB670
Commissioning manual