Section 5 1MRK 505 350-UEN
Additional protection options
40 Technical Manual
Distributed busbar protection REB500
Figure 9 Settings of BFP
In the “Details” view, BFP can be activated per bay: Intertripping (remote trip) can
be applied after completion of either timer t
1
or t
2
. For a description of the different
logic types, please refer to the Application Manual.
5.2 BFP neutral measurement system (BFP L0)
5.2.1 Mode of operation
Certain network configurations (e.g. impedance grounded networks) might cause
fault currents which are below the normal load current. While protection devices
such as sensitive earth fault protections or similar are still starting and tripping the
breaker, the conventional BFP is usually set at levels above normal load currents
for the phase systems. In such situations a separate setting for the neutral current I
0
might be helpful.
Detailed knowledge of the network, the protection systems and
possible fault scenarios is necessary to configure this function
correctly. Misconfiguration might lead to unselective tripping and
loss of supply.
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