Figure 3.7-2 50BF Startup Logic
There are 4 check modes for circuit breaker failure protection, as shown in the following table.
Table 3.7-3 Options for check mode
If the 50BF_Chk_Mod value is 1, the Start logic is activated when the current criteria are fulfilled
and the start input signal is set. If the measured phase current or the measured residual current or
negative current exceeds the 50BF_Cur_Str and 50BF_ResCur_Str settings and
50BF_NegCur_Str, the level detector reports the exceeding of the value to the Start logic. The
residual current or negative current check can be enabled separately.
If the 50BF_Chk_Mod value is 2, the Start logic is activated when the CB position is closed and the
start input signal is set.
If the 50BF_Chk_Mod value is 3, the Start logic is activated when the current criteria or CB
position are fulfilled and the start input signal is set.
If the 50BF_Chk_Mod value is 4, the Start logic is activated when the current criteria and CB
position are fulfilled and the start input signal is set.
Once the start logic is activated(50BF_ExtStr1=1), 50BF can be reset only after the 50BF_CBF
State return and last for 50BF_Max_T, the 50BF_Max_T is the max value of the duration of the
50BF_ReTr_T, 50BF_Op_T1, 50BF_BFTrBu_T and 50BF_Max_T settings, the default value of
50BF_Max_T is 150ms.
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