A current check with extremely short reset time is used as check criterion to
achieve high security against unwanted operation.
Contact check criteria can be used where the fault current through the breaker is
small.
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 its
own breaker to avoid unnecessary tripping of surrounding breakers at an incorrect
initiation due to mistakes during testing.
8.6.3 Function block
M11944-3 v7
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-US
Figure 93: CCRBRF function block
8.6.4 Signals
PID-3562-INPUTSIGNALS v7
Table 101: 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
1MRK 505 394-UEN A Section 8
Current protection
Line differential protection RED650 2.2 IEC 213
Technical manual
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