Bfp Neutral Measurement System (Bfp L0); Mode Of Operation - ABB RELION REB500 Operation Manual

Section 6
Additional protection options
IEC18000464 V1 EN-US
Figure 11:
In the Details view, BFP can be activated per bay; Intertripping (remote trip) can be applied
after completion of either timer t1 or t2. For a description of the different logic types, refer to
Application Manual .
the
The breaker failure function includes the setting Enable start input supervision. For details
about the functionality and the supervised signals, please refer to the
6.2

BFP neutral measurement system (BFP L0)

6.2.1

Mode of operation

Certain network configurations (for example, 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 I0 might be helpful.
44
Settings/Breaker failure protection - Details
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.
© Copyright 2019 ABB. All rights reserved
1MRK 505 400-UEN B
14000027-IEC18000464-1-en.vsdx
Application Manual .
GUID-21C98B84-CF4A-4C67-BE49-EE0E4E7E2E3C v1
Distributed busbar protection REB500
Technical manual