Schweitzer Engineering Laboratories SEL-751 - Figure 4.105 Analog Input Card Adaptive Name

4.180
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Global Settings (SET G Command)
EXAMPLE 4.36 Output Logic Programming Example 1:
SEL-751 applied at the source breaker.
Assume light sensors LS1, LS2, and LS3 are located downstream of the
source breaker and output contacts in Slot 3 are selected for high-speed
processing (AOUTSLOT := 301_4).
Set:
OUT301FS := N
OUT301 := (50PAF OR 50NAF) AND (TOL1 OR TOL2 OR TOL3) OR TRIP
TR := ORED50T OR ORED51T OR … OR (50PAF OR 50NAF) AND (TOL1 OR
TOL2 OR TOL3)
EXAMPLE 4.37 Output Logic Programming Example 2:
SEL-751 applied at the radial feeder breaker.
Assume light sensors LS1 and LS2 are located downstream, LS3 is located
upstream of the feeder breaker, and output contacts in Slot 3 are selected
for the high speed processing (AOUTSLOT := 301_4).
Set:
OUT301FS := N, OUT302FS := N
OUT301 := (50PAF OR 50NAF) AND (TOL1 OR TOL2) OR TRIP
OUT302 := TOL3
TR := ORED50T OR ORED51T OR … OR (50PAF OR 50NAF) AND (TOL1 OR
TOL2)
Use the OUT302 contact to trip upstream breaker. Note that OUT302 does
not include overcurrent element supervision. When desired, this supervision
should be added by upstream relay(s). For instance, you can do the
following:
➤ Connect OUT302 of breaker 2 relay to drive IN302 of the
breaker 1 relay
➤ Add IN302 to the OR string of TOLn in both OUT301 and TR
equations of breaker 1 relay.
You can use M
IRRORED BITS instead of IN302 for faster operation if desired.
Analog Inputs
The SEL-751 tracks the power system frequency and samples the analog
inputs four times per power system cycle. For analog inputs, set the following
parameters for each input:
➤ Analog type
➤ High and low input levels
➤ Engineering units
Because of the flexibility to install different cards in the rear-panel slots on the
device, the setting prompt adapts to the x and y variables shown in
Figure 4.105. Variable x displays the slot position (3 through 5), and variable y
displays the transducer (analog) input number (1 through 4 or 8).
Figure 4.105 Analog Input Card Adaptive Name
Inputs Number (1 through 8)
Slot Position (3 through 5)
Analo
g
In
p
ut
A
Ix0y