9.4
SEL-751A Relay Instruction Manual Date Code 20100129
Analyzing Events
Event Reporting
The relay sends event summaries to all serial ports with setting AUTO := Y
each time an event triggers.
Event Type
The Event field displays the event type. Event types and the logic used to
determine event types are shown in Table 9.1.
Table 9.1 Event Types (Sheet 1 of 2)
Event Type Event Type Logic
Arc Flash Trip
(50PAF OR 50NAF) AND (TOL1 OR TOL2 OR TOL3
OR TOL4) AND TRIP
AG, BG, CG
Single phase-to-ground faults. Appends T if any overcur-
rent trip asserted.
ABC
Three-phase faults. Appends T if any overcurrent trip
asserted.
AB, BC, CA
Phase-to-phase faults. Appends T if any overcurrent trip
asserted.
ABG, BCG, CAG
a
Phase-to-phase-to-ground faults. Appends T if any over-
current trip asserted.
Phase A1 50 Trip
50A1P AND 50P1T AND TRIP
Phase B1 50 Trip
50B1P AND 50P1T AND TRIP
Phase C1 50 Trip
50C1P AND 50P1T AND TRIP
Phase 50 Trip
(50P2T OR 50P3T OR 50P4T) AND TRIP
GND/NEUT 50 Trip
(50N1T OR 50N2T OR 50N3T OR 50N4T OR 50G1T
OR 50G2T OR 50G3T OR 50G4T) AND TRIP
NEG SEQ 50 Trip
(50Q1T OR 50Q2T OR 50Q3T OR 50Q4T) AND TRIP
Phase A 51 Trip
51AT AND TRIP
Phase B 51 Trip
51BT AND TRIP
Phase C 51 Trip
51CT AND TRIP
Phase 51 Trip
(51P1T OR 51P2T) AND TRIP
GND/NEUT 51 Trip
(51N1T OR 51N2T OR 51G1T OR 51G2T) AND TRIP
NEG SEQ 51 Trip
(51QT) AND TRIP
59 Trip
(59P1T OR 59P2T OR 59G1T OR 59G2T OR 59Q1T OR
59Q2T) AND TRIP
55 Trip
55T AND TRIP
Underfreq 81 Trip
(81DnT AND TRIP) when 81DnTP < FNOM setting,
n = 1, 2, 3, 4, 5, or 6
Overfreq 81 Trip
(81DnT AND TRIP) when 81DnTP > FNOM setting,
n = 1, 2, 3, 4, 5, or 6
PowerElemnt Trip (3PWR1T OR 3PWR2T) AND TRIP
RTD Trip
(WDGTRIP OR BRGTRIP OR AMBTRIP OR OTH-
TRIP) AND TRIP
Remote Trip
REMTRIP AND TRIP
27 Trip
(27P1T OR 27P2T) AND NOT LOP AND TRIP
RTD Fail Trip
RTDFLT AND TRIP
Breaker Failure Trip
BFT AND TRIP
CommIdleLossTrip
(COMMIDLE OR COMMLOSS) AND TRIP
Trigger
Serial port TRI command
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