ABB RELION 670 Series Applications Manual page 188

Section 7
Current protection
7.7.3 Setting guidelines
The parameters for Breaker failure protection, single phase version (CCSRBRF,50BF) are set via the
local HMI or PCM600.
The following settings can be done for the breaker failure protection.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
Operation : Disabled or Enabled
FunctionMode: This parameter can be set to Current or Contact . This states the way the detection
of failure of the breaker is performed. In the mode
the detection. In the mode
failure of the breaker. The mode
activated.
breaker is small. This can be the case for some generator protection application (for example,
reverse power protection) or in case of line ends with weak end infeed.
RetripMode : This setting states how the re-trip function shall operate. Retrip Off means that the
re-trip function is not activated.
that a phase current must be larger than the operate level to allow re-trip.
breaker position check) and
position is used).
Pickup_PH : Current level for detection of breaker failure, set in % of IBase . This parameter must 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 initiate the breaker failure protection.
Typical setting is 10% of
PU_BlkCont : If any contact based detection of breaker failure is used this function can be blocked
if the current is larger than this setting level. If the
breaker failure for high current faults are safely detected by the current measurement function. To
increase security the contact based function must be disabled for high currents. The setting can
be given within the range 5 – 200% of
t1 : Time delay of the re-trip. The setting can be given within the range 0 – 60 s in steps of 0.001 s.
Typical setting is 0 – 50 ms.
t2 : Time delay of the back-up trip. The choice of this setting is made as short as possible at the
same time as unwanted operation must be avoided. Typical setting is 90 – 150 ms (also dependent
of re-trip timer).
The minimum time delay for the re-trip can be estimated as:
³ +
t 2 t 1
EQUATION1430 V1 EN-US
182
Contact the long duration of initiate signal (trip) is used as indicator of
Current&Contact means that both ways of detections are
Contact mode can be usable in applications where the fault current through the circuit
CB Pos Check (circuit breaker position check) and Current means
Contact means retrip is done when circuit breaker is closed (breaker
No CB Pos Check means re-trip is done without check of breaker position.
IBase .
+ +
t t t
cbopen BFP reset _ margin
Current the current measurement is used for
FunctionMode is set to Current&Contact
IBase .
1MRK 505 337-UUS A
SEMOD127980-4 v5
CB Pos Check (circuit
(Equation 43)
Application manual