Schweitzer Engineering Laboratories, Inc.
SEL-351R Falcon Data Sheet
9
B
ITS
) for each serial port operating in the M
IRRORED
B
ITS
mode (see Figure 10). Use these M
IRRORED
B
ITS
to
transmit/receive information between an upstream relay
and a downstream recloser control to enhance
coordination and achieve faster tripping for downstream
faults. M
IRRORED
B
ITS
technology also helps reduce
total scheme operating time by eliminating the need to
assert output contacts to transmit information.
Figure 10
M
IRRORED
B
ITS
Transmit and Receive Bits
Advanced SEL
OGIC
Control Equations
Advanced SEL
OGIC
control equations allow you to
assign relay outputs to any logical combination of Relay
Word elements or inputs.
Program SEL
OGIC
control equations by combining relay
elements, inputs, and outputs with SEL
OGIC
control
equation operators. Bits in a table called the “Relay
Word” reflect the state of all logical elements in the
recloser control. These logical elements include all
current (50/51) and directional-level detecting elements,
timer elements, SEL
OGIC
control equation variables,
inputs, outputs, and remote, local, and latched bits.
SEL
OGIC
control equation operators include OR, AND,
invert, parentheses, and rising and falling edges of
element state changes. Analog compare functions (<, >,
=, < >) are also available. These functions add control
flexibility to customize logic based on recloser shot
count or other control values.
The basic building blocks of SEL
OGIC
control equations
are the Relay Word bits. The Relay Word bits are simple
digital quantities having a logical value of either 0 or 1.
The terms “assert” or “asserted” refer to a Relay Word
bit that has a value of 1 or is changing from 0 to 1. The
terms “deassert” or “deasserted” refer to a Relay Word
bit that has a value of 0 or is changing from 1 to 0.
Various elements within the recloser control assert or
deassert Relay Word bits. Use these elements in the fixed
internal logic of the recloser control to make decisions,
to interpret inputs, or to drive outputs. These bits are
available so that you can exercise flexibility in defining
inputs or outputs, in specifying control variables for
internal logic, or in creating special customized logic
through the use of SEL
OGIC
control equations.
In addition to Boolean logic, 16 general purpose
SEL
OGIC
control equation timers eliminate external
timers for custom protection or control schemes. Each
timer has independent time-delay pickup and dropout
settings. Program each timer input with any element
(e.g., time qualify a voltage element) you specify. Assign
the timer output to trip logic, transfer trip
communications, or other control scheme logic.
The SEL-351R Falcon has the same SEL
OGIC
control
equations capability as the established SEL-351R-2.
Hardware Overview
The convenient side-panel construction of the SEL-351R
Falcon provides easy access to all controls and connec-
tions.
Communications ports, contacts, and control cable
connection points are all readily available. Labeling is
shown in Figure 14 (right-hand side).
Figure 11
SEL-351R Falcon Module Side Panel
SEL-351S Relay
Transmit
Receive
Transmit
Receive
.
.
.
.
SEL-351R Falcon Recloser Control
0
0
0
1
0
0
.
.
.
.
1
0
0
0
0
0
TMB1
TMB2
TMB8
RMB1
RMB2
RMB8
RMB8
TMB1
TMB2
TMB8
.
.
.
.
.
.
RMB1
RMB2
.
.
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