In simple words this means that the CB is not breaking the current at the first zero
crossing after separation of the CB contacts. Instead current is re-ignited and only
braked at 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 1MRK 505 370-UUS A
Current protection
242 Busbar protection REB670 2.2 ANSI
Application manual
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