ABB RELION 620 Series Technical Manual page 538

Section 5
Protection-related functions
532
Function resetting is prohibited in 150 ms after TRRET or TRBU is set. The 150 ms time
elapse is provided to prevent malfunctioning due to oscillation in the starting signal.
In case the setting Start latching mode is set to "Level sensitive", the CCBRBRF is reset
immediately after the PICKUP signal is deactivated. The recommended setting value is
"Rising edge".
The resetting of the function depends on the CB failure mode setting.
• If CB failure mode is set to "Current", the resetting logic further depends on the CB
failure trip mode setting.
• If CB failure trip mode is set to "1 out of 3", the resetting logic requires that the
values of all the phase currents drop below the Current value setting.
• If CB failure trip mode is set to "1 out of 4", the resetting logic requires that the
values of the phase currents and the residual current drops below the Current
value and Current value Res setting respectively.
• If CB failure trip mode is set to "2 out of 4", the resetting logic requires that the
values of all the phase currents drop below the Current value setting.
• If CB failure mode is set to the "Breaker status" mode, the resetting logic requires that
the circuit breaker is in the open condition.
• If the CB failure mode setting is set to "Both", the resetting logic requires that the
circuit breaker is in the open condition and the values of the phase currents and the
residual current drops below the Current value and Current value Res setting
respectively.
The activation of the BLOCK input resets the function.
1MAC504801-IB E
620 series ANSI
Technical Manual