ABB RELION REB670, Applications Manual

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GlobalBaseSel : Selects the global base value group used by the function to define
IBase , VBase and SBase as applicable.
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 Current the current
measurement is used for the detection. In the mode Contact the long duration of initiate
signal (trip) is used as indicator of failure of the breaker. The mode Current&Contact
means that both ways of detections are activated. Contact mode can be usable in
applications where the fault current through the circuit 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. CB Pos Check (circuit breaker position check)
and Current means that a phase current must be larger than the operate level to allow
re-trip. CB Pos Check (circuit breaker position check) and Contact means retrip is done
when circuit breaker is closed (breaker position is used). No CB Pos Check means re-
trip is done without check of breaker position.
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
IBase .
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 FunctionMode is set to
Current&Contact 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
IBase .
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:
_
2 1
³ + + +
cbopen BFP reset margin
t t t t t
EQUATION1430 V1 EN-US
(Equation 40)
Section 7
1MRK 505 370-UUS A
Current protection
220 Busbar protection REB670 2.2 ANSI
Application manual