ABB REL 551 2.3 Series Installation And Comissioning Manual page 88






82
Breaker failure protection (BFP)
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Prepare the terminal for verification of settings as outlined in section "Preparing for
test" in this chapter.
Consider to release used start criteria. The trip is a pulse with a length of 150 ms. Fault
condition: the current in a phase must exceed the set IP> as latest within the set t1 time
after the START/STLN input is activated.
To verify the settings the following fault type should be tested:
• One for a phase-to-earth fault
The breaker-failure protection should be tested in co-operation with some other func-
tions, and in particular with the protection and trip functions or via external start.
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Note: If no I> check is set only back-up trip operate at set IP>.
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Choose one of the test cases in
ting.
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4.2 "Verifying the retrip setting"
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according to valid set-