ABB REB670 Applications Manual page 235

1MRK 505 337-UUS -
Application manual
consecutive current zero crossings. This condition is manifested as high current pulses at
the moment of current re-ignition.
To detect this CB condition, the built in overcurrent feature can be used. Simply, any start
of the overcurrent feature during breaker normal opening means a restrike. Therefore
simple logic can be created in the Application Configuration tool to detect such CB
behavior. Such CB condition can be just alarmed, and if required, the built in disturbance
recorder can also be triggered.
To create this logic, a binary signal that the CB is going to be opened (but not trip
command) shall be made available to the IED.
Section 7
Current protection
229