P.3.330
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Protection Application Examples
We would have the following at both terminals:
EPO := 52 Pole Open Detection (52, V)
SPOD := 0.500 Single-Pole Open Dropout Delay (0.000–60 cycles)
3POD := 0.500 Three-Pole Open Dropout Delay (0.000–60 cycles)
Trip Logic
Set TR to current differential, Zone 1 instantaneous distance protection and
Zone 2 time-delayed distance protection, and SOTF.
TR := 87OP OR Z1T OR Z2T (SEL
OGIC control equation)
Set instantaneous overcurrent element 50P1 and Zone 2 distance protection in
the TRSOTF SEL
OGIC control equation.
TRSOTF := M2P OR Z2G OR 50P1 Switch-Onto-Fault Trip (SEL
OGIC
control equation)
Use the default setting to assert ULTR when you push the front-panel target
reset.
ULTR := TRGTR Unlatch Trip (SEL
OGIC control equation)
This application uses an external reclosing relay, so set TOPD to the single-
pole open dead time (30 cycles) and the reset time (three seconds) for the
recloser plus a 5-cycle safety margin.
TOPD := 215.00 Trip During Open Pole Time Delay (2.000–8000 cycles)
Select the third option for TULO, because breaker auxiliary contacts are
available.
TULO := 3 Trip Unlatch Option (1, 2, 3, 4)
This is a two terminal application, so selection of 87DTT does not provide
additional availability. Set E87DTT to 0.
E87DTT := 0 Disable 87 Direct Transfer Trip (SEL
OGIC control equation)
Manual breaker tripping is not necessary for this application.
BK1MTR := NA Breaker 1 Manual Trip -BK1 (SEL
OGIC control
equation)
BK2MTR := NA Breaker 2 Manual Trip -BK2 (SEL
OGIC control
equation)
ULMTR1 := NA Unlatch Manual Trip -BK1 (SEL
OGIC control equation)
ULMTR2 := NA Unlatch Manual Trip -BK2 (SEL
OGIC control equation)
Single-Pole Trip Options
Program the SEL-411L to single-pole trip for Zone 2 ground distance
operations.
Z2GTSP := Y Zone 2 Ground Distance Time Delay SPT (Y, N)
This application does not use communications-assisted tripping, so do not
allow single-pole tripping from overcurrent elements.
67QGSP := N Zone 2 Dir. Negative-Sequence/Residual Ground
Overcurrent SPT
Apply the typical setting of 9 cycles for the minimum trip duration timers.
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