ABB Relion 670 Series Applications Manual page 201

1MRK 505 370-UUS Rev. K
PICKUP
Current Check
CB Position Check
ANSI18001003 V1 EN-US
Figure 106: Simplified overall logic for FollowStart
PICKUP
Current Check
CB Position Check
ANSI18001004 V1 EN-US
Figure 107: Simplified overall logic for FollowStart&Mode
RetripMode: This setting defines how the retrip function shall operate. Refer to Table
Table 34:
RetripMode
Off
UseFunctionMode
Always
: 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 accordance with the most
sensitive protection function to start the breaker failure protection. Default setting is 10% of IBase. Note
that this setting shall not be set lower than 4% of Ir, where Ir is rated current of the IED CT input where
function is connected. In principle Ir is either 1A or 5A depending on the ordered IED
PU_BlkCont: If the FunctionMode is set to Current or CB pos breaker failure for high current faults are
safely detected by the current measurement function. To increase security for low currents the contact
Busbar protection REB670
Application manual
t1 t1
t t
OR
t2 t2
t t
OR
Dependencies between RetripMode and FunctionMode
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OR OR
AND
AND
OR OR
ANSI18001003-1-en.vsdx
t1
AND
t
t2
t
FunctionMode
N/A
Current
CB Pos
Current or CB Pos
N/A
TRRET
TRBU
TRRET
TRBU
ANSI18001004-1-en.vsdx
34 for more details.
Description
the re-trip function is disabled
a phase current must be larger than
the set operate level to allow re-trip
once the t1 timer elapses
Re-trip is done when breaker position
indicates that breaker is still closed
after re-trip time has elapsed
both methods are used
Re-trip is always given when t1
elapses without any further checks
Section 7
Current protection
195