Sel 2414 - SEL Communications Processor and Device Architecture; Developing Star Networks

C.5
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
SEL Communications Processors
SEL Communications Processor and Device Architecture
SEL Communications Processor and
Device Architecture
You can apply SEL communications processors and SEL devices 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
Figure C.1 shows the simplest architecture using both the SEL-2414 and an SEL
communications processor. In this architecture, the SEL communications proces-
sor collects data from the SEL-2414 and other station IEDs. The SEL communi-
cations 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 configura-
tion 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 com-
munications 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 any SEL
communications processor directly to the SCADA master and eliminating redun-
dant 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 devices and other station IEDs. This insulation of the protective
devices from the communications interface assists greatly in situations where dif-
ferent departments are responsible for SCADA operation, communication, and
protection.
SEL communications processors equipped with an SEL-2701 Ethernet Processor
can provide a UCA2 interface to the SEL-2414 and other serial IEDs. The
SEL-2414 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 accommo-
date the channel that is available between the station and the engineering center.
SEL software can use either a serial port connection or an Ethernet network con-
nection from an engineering workstation to the devices in the field.