Schweitzer Engineering Laboratories SEL-751 - Table 10.2 Phase Involvement Event Type

10.5
Date Code 20170927 Instruction Manual SEL-751 Relay
Analyzing Events
Event Reporting
GND/NEUT 51 Trip
(51N1T + 51N2T + 51G1T + 51G2T) * TRIP
a
NEG SEQ 51 Trip
(51QT) * TRIP
a
59 Trip
(59P1T + 59P2T + 59PP1T + 59PP2T + 59G1T + 59G2T + 59Q1T + 59Q2T + 59I1T + 59I2T +
59I3T + 59I4T)* TRIP
55 Trip
55T * TRIP
78 Trip
78VSO * TRIP
Undrfreq 81 Trip
(81DnT * TRIP) when 81DnTP < FNOM setting, n = 1, 2, 3, 4, 5, or 6.
Overfreq 81 Trip
(81DnT * TRIP) when 81DnTP > FNOM setting, n = 1, 2, 3, 4, 5, or 6.
PowerElemnt Trip
(3PWR1T + 3PWR2T) * TRIP
RTD Trip
(WDGTRIP + BRGTRIP + AMBTRIP + OTHTRIP) * TRIP
49 Thermal Trip
(THRLT1 + THRLT2 + THRLT3) * TRIP
Remote Trip
REMTRIP * TRIP
27 Trip
(27P1T + 27P2T+ 27PP1T + 27PP2T + 27I1T + 27I2T) * !LOP * TRIP
RTD Fail Trip
RTDFLT * TRIP
Brk Failure Trip
BFT * TRIP
CommIdleLossTrip
(COMMIDLE + COMMLOSS)*TRIP
Trigger
Trigger command
ER Trigger
ER equation assertion
a
Trip
TRIP with no known cause
a
The GFLT bit asserts if any one of the residual overcurrent or residual time-overcurrent Relay Word bits pick up during the event. The NFLT
bit asserts if any one of the neutral overcurrent or neutral time-overcurrent Relay Word bits pick up during the event. When PHASE_A,
PHASE_B, PHASE_C, or GFLT is set to latch target LEDs, latching can only occur when TRIP occurs after the event trigger and within the
event. PHASE_A, PHASE_B, PHASE_C, and GFLT bits assert for a fixed duration of (LER – PRE – 0.75) cycles.
Table 10.1 Event Types (Sheet 2 of 2)
Event Type Event Type Logic
Table 10.2 Phase Involvement Event Type (Sheet 1 of 2)
Type Condition
ABC PHASE_A * PHASE_B * PHASE_C * NOT TRIP
AB PHASE_A * PHASE_B * NOT TRIP
BC PHASE_B * PHASE_C * NOT TRIP
CA PHASE_C * PHASE_A * NOT TRIP
ABG PHASE_A * PHASE_B * GFLT * NOT TRIP
BCG PHASE_B * PHASE_C * GFLT * NOT TRIP
CAG PHASE_C * PHASE_A * GFLT * NOT TRIP
AG PHASE_A * NOT TRIP
BG PHASE_B * NOT TRIP
CG PHASE_C * NOT TRIP
ABC T PHASE_A * PHASE_B * PHASE_C*TRIP
AB T PHASE_A * PHASE_B * TRIP
BC T PHASE_B * PHASE_C * TRIP
CA T PHASE_C * PHASE_A * TRIP
ABG T PHASE_A * PHASE_B * GFLT * TRIP
BCG T PHASE_B * PHASE_C * GFLT * TRIP