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PRODUCT OVERVIEW
SEL-2020 Description
The SEL-2020 Communications Processor (SEL-2020) provides many special features needed in
today's substations for communicating with a variety of microprocessor-based devices, including
digital fault recorders, sequential events recorders (SER), digital meters, and digital relays. The
SEL-2020 can function as a simple, but intelligent, port switch. Or it can provide sophisticated
communication and data handling capability required for advanced substation integration
projects. Data are collected, processed, and stored in the SEL-2020 database, permitting quick
distribution of selected data to an RTU (remote terminal unit) or other device. Figure 1 shows an
example block diagram configuration of the SEL-2020 with various SEL relays and peripheral
devices connected.
Enhanced/Intelligent Port Switching
Unlike conventional port switches, the SEL-2020 can support communications on all active ports
— simultaneously — at baud rates up to 19200 or 38400 depending on port configuration. This
means that you can communicate locally through the SEL-2020 with one connected intelligent
electronic device (IED) at the same time that someone else is communicating remotely through
the same SEL-2020 to another connected IED. Other intelligent features, like the SEL-2020 auto-
configuration function, make setup and operation much easier than with simple port switches. In
advanced applications, where the SEL-2020 is used to collect, store, and distribute information,
the simultaneous communication function provides an uninterrupted flow of information from all
active IEDs to an RTU or station integration computer; at the same time you can communicate
through the SEL-2020, either locally or remotely, with one of the connected relays or IEDs.
Data Collection, Processing, Storage, Distribution
You can collect, store, process, and distribute target, meter, event, status, and other information
— virtually all information available from an SEL relay and a variety of information available
from other IEDs — with the SEL-2020, using a simple, but powerful, set of communication
commands. Likewise, the SEL-2020 reduces the processing burden for these external devices by
separating selected data from IEDs so that only the essential information is delivered and in the
form and format required.
Substation Integration and Network Interface
Communication and information handling features make the SEL-2020 ideal for substation
integration projects, eliminating the need for separate substation network architecture. On larger
integration projects, the SEL-2020 reduces or eliminates the need for costly network interface
devices, otherwise required for each IED. Inclusion of Modbus and DNP support eases integra-
tion with systems that support Modbus or DNP.
Time Synchronization
The SEL-2020 can synchronize the time clocks in attached devices, such as SEL relays, that
accept a demodulated IRIG-B time signal. The demodulated IRIG-B signal is regenerated in the
SEL-2020 from an external modulated or demodulated source, such as a GOES or GPS satellite
clock receiver. If no IRIG-B source is available, the demodulated IRIG-B time signal is gener-
ated internally by the SEL-2020.
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