Schweitzer Engineering Laboratories, Inc.
SEL- 2664S Data Sheet
5
Apply an SEL communications processor as the hub of a
star network, with point-to-point connection between the
hub and the SEL-2664S (see
).
The communications processor supports external
communications links including the public switched
telephone network for engineering access to dial-out
alerts and private line connections of the SCADA system.
Figure 3
Example Communications System
SEL manufactures a variety of standard cables for
connecting this and other relays to a variety of external
devices. Consult your SEL representative for more
information on cable availability.
SEL-2664S control logic improves integration in the
following ways.
➤
Eliminates RTU-to-relay wiring with eight
remote bits.
Set, clear, or pulse remote bits through
the use of serial port commands. Program the
remote bits into your control scheme with SEL
OGIC
control equations. Use remote bits for SCADA-type
control operations, such as trip and close.
➤
Replaces traditional latching relays.
Replace as
many as eight traditional latching relays for such
functions as “remote control enable” with latch bits.
Program latch set and latch reset conditions with
SEL
OGIC
control equations. Use optoisolated inputs,
remote bits, or any programmable logic condition to set
or reset the nonvolatile latch bits. Each latch bit retains
its state when the relay loses power.
➤
Eliminates external timers.
Replace external
timers for custom protection or control schemes
with eight general-purpose SEL
OGIC
control equa-
tion timers. Each timer has independent time-delay
pickup and dropout settings. Program each timer
input with any element you need (e.g., time qualify
a current element). Assign the timer output to trip
logic, transfer trip communications, or other control
scheme logic.
Fast SER Protocol
SEL Fast SER Protocol provides SER events to an automated
data collection system. SEL Fast SER Protocol is
available on any serial port. Devices with embedded
processing capability can use these messages to enable
and accept unsolicited binary SER messages from the
SEL-2664S Relay.
SEL relays and communications processors have two
separate data streams that share the same serial port. The
normal serial interface consists of ASCII character
commands and reports that are human readable through
use of a terminal or terminal emulation package. The
binary data streams can interrupt the ASCII data stream to
obtain information, and then allow the ASCII data stream
to continue. This mechanism allows use of a single
communications channel for ASCII communications
(e.g., transmission of a long event report) interleaved with
short bursts of binary data to support fast acquisition of
metering or SER data.
Ethernet Network Architectures
Figure 4
Simple Ethernet Network Configuration
Dial-Up ASCII Link
SCADA Link
SEL Communications Processor
ASCII Reports Plus
Interleaved Binary Data
SEL-2664S
IED
IED
IED
Cat 5 shielded twisted pair (STP) cables
with RJ45 connectors (SEL-C627/C628)
for copper Ethernet ports
OR
Fiber-optic Ethernet cables with
LC connectors (SEL-C808) for
fiber-optic Ethernet ports
NETWORK
Fiber only
