SEL-451 Data Sheet
Schweitzer Engineering Laboratories, Inc.
16
Flexible Control Logic and
Integration Features
The SEL-451 control logic can be used to perform the
following:
➤
Replace traditional panel control switches
➤
Eliminate remote terminal unit (RTU)-to-bay wiring
➤
Replace traditional latching relays
➤
Replace traditional indicating panel lights
Eliminate traditional panel control switches with 32 local
control points. Set, clear, or pulse local control points with
the front-panel pushbuttons and display. Program the local
control points to implement your control scheme via
SEL
OGIC
control equations. Use the local control points for
such functions as trip testing, enabling/disabling reclosing,
and tripping/closing circuit breakers.
Eliminate RTU-to-bay wiring with 32 remote control
points. Set, clear, or pulse remote control points via serial
port commands. Incorporate the remote control points
into your control scheme via SEL
OGIC
control equations.
Use remote control points for SCADA-type control oper-
ations (e.g., trip, close, settings group selection).
Replace traditional latching relays for such functions as
“remote control enable” with 32 latching control points.
Program latch set and latch reset conditions with
SEL
OGIC
control equations. Set or reset the latch control
points via control inputs, remote control points, local
control points, or any programmable logic condition. The
latch control points retain states when the relay loses power.
Replace traditional indicating panel lights and switches
with as many as 24 latching target LEDs and as many as
12 programmable pushbuttons with LEDs. Define cus-
tom messages (i.e.,
BREAKER OPEN
,
BREAKER CLOSED
,
RECLOSER ENABLED
) to report power system or relay con-
ditions on the large format LCD. Control which mes-
sages are displayed via SEL
OGIC
control equations by
driving the LCD display via any logic point in the relay.
Open Communications Protocols
The SEL-451 does not require special communications
software. ASCII terminals, printing terminals, or a com-
puter supplied with terminal emulation and a serial com-
munications port are all that is required.
lists a
brief description of the terminal protocols.
Figure 22
Sample SEL-451 Topology
Port
6A
6B
6C
6D
6E
6F
Analogs
IAW, IBW, ICW
IAX, IBX, ICX
(optional)
VAY, VBY, VCY
VAZ (optional)
VBZ (optional)
VCZ (optional)
IAW, IBW, ICW
Feeder 1
IAW, IBW, ICW
Feeder 2
VAY,
VBY,
VCY
VAY,
VBY,
VCY
VAZ
(sync.
check)
SEL Axion
SEL Axion
SEL Axion
SEL Axion
SEL Axion
SEL Relay
SEL Relay
Control House
Substation Yard
