4.7.2 Synchronizing using PPS........................................................................................................38
4.7.3 Synchronization by SNTP....................................................................................................... 38
4.7.4 Additional settings................................................................................................................... 39
4.7.4.1 Time zone correction..........................................................................................................39
4.7.4.2 Daylight saving time........................................................................................................... 39
Section 5 Busbar protection.............................................................................................41
5.1 Configuration............................................................................................................................. 41
5.2 Tripping logic............................................................................................................................. 42
Section 6 Additional protection options..........................................................................43
6.1 Breaker failure protection (BFP)................................................................................................43
6.1.1 Mode of operation................................................................................................................... 43
6.1.2 Configuration...........................................................................................................................45
6.2 BFP neutral measurement system (BFP L0).............................................................................46
6.2.1 Mode of operation................................................................................................................... 46
6.2.2 Configuration or current setting of BFP L0 system..................................................................48
6.2.2.1 Details................................................................................................................................ 49
6.3 Overcurrent definite time protection.......................................................................................... 50
6.3.1 Mode of operation................................................................................................................... 50
6.3.2 Configuration of overcurrent protection...................................................................................50
6.4 End fault protection................................................................................................................... 51
6.4.1 Mode of operation................................................................................................................... 51
6.4.2 Configuration...........................................................................................................................53
6.5 Breaker pole discrepancy protection (PDF).............................................................................. 54
6.5.1 Mode of operation................................................................................................................... 54
6.5.2 Configuration...........................................................................................................................56
Section 7 Additional functions......................................................................................... 57
7.1 Voltage release..........................................................................................................................57
7.1.1 Combined over- and undervoltage release............................................................................. 58
7.1.2 VT assignment........................................................................................................................ 59
7.1.2.1 VT Located in a feeder or a bus-tie breaker arrangement ................................................ 60
7.1.2.2 VT Located at the busbar...................................................................................................60
7.2 Enabling tripping commands..................................................................................................... 60
7.2.1 Overcurrent release of the trip command................................................................................60
7.2.2 Release logic or matrix............................................................................................................61
7.2.2.1 Enabling bay unit functions (column 5).............................................................................. 61
7.2.2.2 Enabling protection zone functions (columns 1 to 4)..........................................................62
7.2.3 Release by 31805_External release BB zone.........................................................................63
7.2.4 Release by the internal voltage function................................................................................. 63
7.3 Trip redirection...........................................................................................................................63
Table of contents 1MRK 505 400-UUS Rev. B
2Distributed busbar protection REB500
Technical manual
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