CCRBRF can be single- or three-phase initiated to allow use with single phase
tripping applications. For the three-phase version of CCRBRF the current criteria can
be set to operate only if two out of four for example, two phases or one phase plus the
residual current start. This gives a higher security to the back-up trip command.
CCRBRF function can be programmed to give a single- or three-phase re-trip of the
own breaker to avoid unnecessary tripping of surrounding breakers at an incorrect
initiation due to mistakes during testing.
8.8.3 Function block
IEC06000188-2-en.vsd
CCRBRF
I3P*
BLOCK
START
STL1
STL2
STL3
CBCLDL1
CBCLDL2
CBCLDL3
CBFLT
TRBU
TRBU2
TRRET
TRRETL1
TRRETL2
TRRETL3
CBALARM
IEC06000188 V2 EN
Figure 184: CCRBRF function block
8.8.4 Signals
Table 200: CCRBRF Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
BLOCK BOOLEAN 0 Block of function
START BOOLEAN 0 Three phase start of breaker failure protection
function
STL1 BOOLEAN 0 Start signal of phase L1
STL2 BOOLEAN 0 Start signal of phase L2
STL3 BOOLEAN 0 Start signal of phase L3
CBCLDL1 BOOLEAN 0 Circuit breaker closed in phase L1
CBCLDL2 BOOLEAN 0 Circuit breaker closed in phase L2
CBCLDL3 BOOLEAN 0 Circuit breaker closed in phase L3
CBFLT BOOLEAN 0 CB faulty, unable to trip. Back-up trip
instantaneously
Section 8 1MRK502052-UEN B
Current protection
408
Technical manual
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