Figure 76: Activating Backup Trip; Figure 77: Deactivating Backup Trip - ABB UniGear Digital Commissioning And Testing Manual

AP PAR ATU S CO NTR O L T E S TI NG
Step 6/10
On the protection relay LHMI (tested feeder) go to -> Main Menu/Test/Function tests/
Other protection
– CCBRBRF1 = Activate TRBU (backup trip logic output)

Figure 76: Activating backup trip

The Incomer and Bus tie circuit breakers must trip immediately.
Then
On the protection relay LHMI (tested feeder) go to -> Main Menu/Test/Function tests/
Other protection
– CCBRBRF1 = Deactivate TRBU

Figure 77: Deactivating backup trip

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