Date Code 20010518 “Job Done” Examples - (Example 3) 4-25
SEL-2020 Instruction Manual
EXAMPLE 3: SEL-2020 APPLIED TO SCADA RTU DATA ACCESS
I
NTRODUCTION
Example 3 is similar to Examples 1 and 2, except an RTU is added in this example to
demonstrate the database and data transfer capabilities of the SEL-2020.
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
SEL-251
Relay
Optional
Modem
Port 8
Port 7Port 6Port 5Port 4Port 3Port 2Port 1
SEL-2020
Port 2R
Telephone
Line
DWG: 2020_11.vsd
RTU
Port 11
Printer
Port 9
Fast Meter
Port F
Local
Terminal
Port 10
GETDAT
1I
A
. . . 7I
A
1V
A
. . . 7V
A
I
A
, V
A
(for all relay ports)
Port 2R Port 2R
Port 2R Port 2R Port 2R Port 2R
Figure 4.3: SCADA RTU Configuration Diagram
IDENTIFYING THE PROBLEM
Your objective in Example 3 is to collect A-phase voltage and current information from the
substation feeders for the SCADA system. After evaluating several options, you decide that the
most cost-effective method is to use the SEL-2020 to collect metering data from the seven
substation relays. You want the SEL-2020 to collect data every second to avoid data latency
when the RTU requests data at 1.5 second intervals.
DEFINING THE SOLUTION
The solution is to use the automatic database features of the SEL-2020. Figure 4.3 shows the
SEL-2020 installation, with the RTU connected to Port 11.
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