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2. OPERATION LOGIC
GEK-106168E DBF Breaker Failure Protection 11
The user can select from the following list which signals may trigger the oscillography:
Events to Trigger the
Oscillography
PICKUP
1ST STAGE TRIP
2ND STAGE TRIP
INTERNAL ARC
50BF A TRIP
50BF B TRIP
50BF C TRIP
50BF 3P TRIP
EXTERNAL TRIGGER
COMM. TRIGGER
HI-SET A PICKUP
HI-SET B PICKUP
HI-SET C PICKUP
50BF A INIT
50BF B INIT
50BF C INIT
LO-SET A PICKUP
LO-SET B PICKUP
LO-SET C PICKUP
3 POLE 50BF INIT
NEUTRAL PICKUP
ARC A PICKUP
ARC B PICKUP
ARC C PICKUP
The oscillography records are retrieved from the relay to the computer in COMTRADE international standard
format using the GE_LOCAL communications program. To draw the waveforms, digital flags, phasors and post-
fault analysis in general, it is suggested to use the GE_OSC oscillography program or any other that accepts
COMTRADE international format (IEEE-C37.111-1991). It is also possible to import the waveforms with
mathematical or spreadsheet programs (for example EXCEL
TM
).