C.5
Date Code 20090730 Instruction Manual SEL-734 Meter
SEL Communications Processors
SEL Communications Processor and Meter Architecture
SEL Communications
Processor and Meter Architecture
You can apply SEL communications processors and SEL meters in a limitless
variety of applications that integrate, automate, and improve station operation.
Most system integration architectures utilizing SEL communications
processors involve either developing a star network or enhancing a multidrop
network.
Developing
Star Networks
The simplest architecture using both the SEL-734 and an SEL
communications processors is shown in Figure C.1. In this architecture, the
SEL communications processor collects data from the SEL-734 and other
station IEDs. The SEL communications processor acts as a single point of
access for local and remote data consumers (local HMI, SCADA, engineers).
The communications processor also provides a single point of access for
engineering operations including configuration and the collection of
report-based information.
By configuring a data set optimized to each data consumer, you can
significantly increase the utilization efficiency on each link. A system that
uses an SEL communications processor to provide a protocol interface to an
RTU will have a shorter lag time (data latency); communication overhead is
much less for a single data exchange conversation to collect all substation data
(from a communications processor) than for many conversations required to
collect data directly from each individual IED. You can further reduce data
latency by connecting an SEL communications processor directly to the
SCADA master and eliminating redundant communication processing in the
RTU.
The SEL communications processor is responsible for the protocol interface,
so you can install, test, and even upgrade the system in the future without
disturbing protective meters and other station IEDs. This insulation of the
protective devices from the communications interface assists greatly in
situations where different departments are responsible for SCADA operation,
communication, and protection.
SEL communications processors equipped with an SEL-2701 can provide a
UCA2 interface to SEL-734 meters and other serial IEDs. The SEL-734 data
appear in models in a virtual device domain. The combination of the
SEL-2701 with an SEL communications processor offers a significant cost
savings because you can use existing IEDs or purchase less expensive IEDs.
For full details on applying the SEL-2701 with an SEL communications
processor, see the SEL-2701 Ethernet Processor Instruction Manual.
The engineering connection can use either an Ethernet network connection
through the SEL-2701 or a serial port connection. This versatility will
accommodate the channel that is available between the station and the
engineering center. SEL software, including the
ACSELERATOR QuickSet
®
SEL-5030 Software Program, can use either a serial port connection or an
Ethernet network connection from an engineering workstation to the meters in
the field.
Courtesy of NationalSwitchgear.com
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