ABB RELION 670 Series Applications Manual page 119

1MRK 505 337-UUS A
1. By using the reset menu on the local HMI
2. By energizing the dedicated binary input called "Reset OCT" via communication links
3. By energizing the dedicated binary input called "Reset OCT" via logic done in the internal
configuration
For more details about the working principles of the Open CT Detection algorithm, refer to
Technical reference manual.
6.1.3.12 Tripping circuit arrangement
The contact outputs are of medium duty type. It is possible to use them to directly trip the
individual bay circuit breakers. This solution is suitable for all types of station arrangements. The
internal zone selection logic provides individual bay trip signals in the internal software and no
external relay for this purpose are required. This arrangement insures correct trip signal
distribution to all circuit breakers in case of busbar protection operation or individual bay breaker
failure protection operation. Breaker failure protection can be internal or external to the IED.
By a parameter setting it is possible to provide self-rest or latched trip output contacts from the
IED. However it shall be noted that the latching is electrical (that is, if dc supply to the IED is lost
the output contacts will reset).
However, sometimes due to a large number of required trip output contacts (that is, single pole
operated circuit breakers and/or main and backup trip coils), a separate trip repeat relay unit is
applied for the tripping of the circuit breakers in the station. In that case the tripping arrangement
can be done in different ways.
6.1.3.13 Trip arrangement with one-phase version
When one-phase version of the IED is used it is typically required to have three IEDs (that is, one
per phase). Thus, when busbar protection in one IED operates the trip commands will be given to
all bays but internal circuit breaker failure function will be started in the same phase only. In order
to secure internal breaker failure picking-up in all three phases it is advisable to do the following.
Connect Zone A trip signal from one IED to the external trip input of the Zone A in the other two
IEDs. Thus all three IEDs will then issue trip in Zone A and pick-up internally circuit breaker failure
protection in all three phases.
Note that:
• similar arrangements shall be done for Zone B
• this have to be done between all three IEDs (that is, three times)
Such a scheme can be arranged in one of the following ways:
• by wiring between three IEDs
• by using GOOSE messages when IEC 61850-8-1 is used
• by using LDCM communication module.
Note that in this case the external trip signal from other two IEDs shall be arranged via pulse timer
in configuration in order to avoid locking of the trip signal between three IED. Such arrangement
via GOOSE is given in figure 52:
Application manual
Section 6
Differential protection
M12116-3 v2
SEMOD130408-5 v1
SEMOD130408-6 v3
113