The breaker failure protection (CCBRBRF1) is initiated via the start input by a
number of different protection stages in the IED. The breaker failure protection
function offers different operating modes associated with the circuit breaker position
and the measured phase and residual currents. The breaker failure protection has two
operating outputs: TRRET and TRBU. The TRRET operate output is used for re-
tripping its own breaker through the Master Trip 2. The TRBU output is used to give
a back-up trip to the breaker feeding upstream. For this purpose, the TRBU operate
output signal is connected to the output PO2 (X100: 8-9). LED 6 is used for back-up
(TRBU) operate indication.
A071338 V5 EN
Figure 20: Arc protection
ARC protection (ARCSARC1-3) and autoreclosing (DARREC1) are included as
optional functions.
1MRS756378 D Section 3
REF615 variants
REF615 51
Application Manual
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