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APPLICATION EXAMPLES
Collect and Format Data from Relays and Other Devices
The operator can define strings to instruct the SEL-2020 to collect and format relay data for
RTUs. Simple settings enable you to individually configure SEL-2020 ports to define their data
retrieval and storage attributes. You can instruct the SEL-2020 to automatically interrogate
connected devices for data collection. Built-in parsing and conversion capabilities help you
retrieve data from many different devices. The SEL-2020 can also provide a uniform data
interface to the RTU, so that the RTU software does not have to specifically accommodate each
IED type.
Access Data Through Multiple Paths
Different departments in a utility may be interested in different data and different data rates. For
example, a system operator may be interested in metering and contact data every five or ten
seconds and fault location shortly after a fault. A protection engineer is usually interested in
setting relays, and analyzing a full event report after a fault occurs. You can accommodate these
needs by connecting one port on the SEL-2020 to a SCADA RTU for the operator and a tele-
phone modem to another port for the protection engineer.
Program the SEL-2020 Database Functions
Use the SEL-2020 settings and SEL
OGIC control equations to build a database of load profiles
and event reports and to store them in nonvolatile memory. Define commands so different
devices can retrieve appropriately formatted data. Use arithmetic functions to sum current,
power, or other data. Subtract sensed information from a threshold value and check the resulting
sign to implement comparisons.
Synchronize All Relay Clocks Within a Substation
The SEL-2020 receives an IRIG-B time-code input from a single IRIG-B receiver or local clock
and distributes it to the devices connected to any of the 16 serial ports. The SEL-2020 supports
modulated or demodulated time-code input.
If there is no external signal, the SEL-2020 generates an IRIG-B signal using an internal clock so
you can synchronize device clocks without an IRIG-B receiver or local clock.
Use Events to Switch Relay Setting Groups
Program the SEL-2020 to use the time of day, day of the week, or a specific event, such as a relay
alarm output, to switch relay setting groups.
Monitor Relay Alarm Contacts
With the optional I/O installed, you can program the SEL-2020 to monitor relay alarm contacts.
Instruct the SEL-2020 to send predetermined messages or initiate an action you designate, like
closing an output contact based on these inputs.
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