DNP3 Configuration in SEL Relays
Key Takeaway
How to configure DNP3 outstation in SEL relays — data point mapping, binary/analog inputs, unsolicited responses, and SCADA master integration.
Quick Answer
Enable DNP3 in Quickset under Communications settings. Set outstation address, port assignment (serial RS-485 or Ethernet), and map relay word bits and metering values to DNP3 binary input, analog input, and counter objects. Enable unsolicited response for protection event reporting.
Data Point Mapping
- Binary Inputs — Protection element states (51PT, 50P, 27, 81), breaker status (52A), alarm bits
- Analog Inputs — Metering (phase currents, voltages, power, frequency, impedance)
- Binary Outputs — Remote trip, settings group switch, target reset
- Counters — Energy accumulators
Event Classes
Class 1 for protection operations and alarms, Class 2 for metering, Class 3 for status.
Testing
Test with Geo SCADA or Ignition as DNP3 master. Verify integrity poll, event reporting, and control commands. See also SCADAPack DNP3 and Geo SCADA DNP3 setup.
Secure Authentication
SEL supports DNP3 SAv5 (HMAC-SHA256) for authenticated control commands — required for NERC CIP compliance at BES substations.
Frequently Asked Questions
In Quickset Communications settings: set outstation address, port, master address, data point map (relay word bits and metering to DNP3 objects), and event class assignment.
Yes. SEL supports unsolicited response, sending protection events and status changes to the SCADA master immediately without waiting for a poll.