ABB Relion 670 Series Applications Manual page 184

Section 8
Current protection
START
Current Check
CB Position Check
IEC18001003 V1 EN-US
Figure 87: Simplified overall logic for FollowStart
START
Current Check
CB Position Check
IEC18001004 V1 EN-US
Figure 88: Simplified overall logic for FollowStart&Mode
RetripMode : This setting defines how the retrip function shall operate. Refer to Table
more details.
Table 25:
RetripMode
Off
UseFunctionMode
Always
BuTripMode : Defines how many current criterias to be fulfilled in order to detect failure of the
breaker. For
currents and the residual current, shall be high to indicate breaker failure.
that at least one current of the three-phase currents shall be high to indicate breaker failure.
out of 4 means that at least one current of the three phase currents or the residual current
shall be high to indicate breaker failure. In most applications
operation
IP> : Current level for detection of breaker failure, set in % of IBase . This parameter should be
set so that faults with small fault current can be detected. The setting can be chosen in
178
t1 t1
t t
OR
t2 t2
t t
OR
Dependencies between parameters RetripMode and FunctionMode
FunctionMode
Current operation 2 out of 4 means that at least two currents, of the three-phase
1 out of 3 is always used.
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OR OR
AND
AND
OR OR
IEC18001003-1-en.vsdx
t1
AND
t
t2
t
N/A
Current
CB Pos
Current or CB Pos
N/A
1MRK 511 401-UEN Rev. K
TRRET
TRBU
TRRET
TRBU
IEC18001004-1-en.vsdx
Description
The retrip function is disabled
A phase current should be larger
than the set operate level to allow
retrip once the t1 timer elapses
retrip is done when the breaker
position indicates that breaker is
still closed after retrip time has
elapsed
Both the methods are used
retrip is always given when
elapses without any further
checks
1 out of 3 means
1 out of 3 is sufficient. For CB Pos
Bay control REC670
Application manual
25 for
t1
1