Date Code 20171006 Instruction Manual SEL-400 Series Relays
Instruction Manual
SECTION 16
DNP3 Communication
The relay provides a DNP3-2009 Level 2 outstation interface for direct network
connections to the relay. This section covers the following topics:
➤ Introduction to DNP3 on page 16.1
➤ DNP3 in the Relay on page 16.7
➤ DNP3 Documentation on page 16.12
➤ DNP3 Serial Application Example on page 16.26
➤ DNP3 LAN/WAN Application Example on page 16.31
Introduction to DNP3
A SCADA (supervisory control and data acquisition) manufacturer developed
DNP3 from the lower layers of IEC 60870-5. Originally designed for use in tele-
control applications, version 3 of the protocol has also become popular for local
substation data collection. DNP3 has been standardized as IEEE 1815.
Rather than wiring individual input and output points from the station RTU to the
station IEDs, many stations use DNP3 to convey measurement and control data
over a single serial or Ethernet cable to the RTU. The RTU then forwards data to
the offsite master station. By using a data communications protocol rather than
hard wiring, designers have reduced installation, commissioning, and mainte-
nance costs while increasing remote control and monitoring flexibility.
The DNP User’s Group maintains and publishes DNP3 standards in cooperation
with IEEE. See the DNP User’s Group web site (www.dnp.org) for more infor-
mation on DNP3 standards, implementers of DNP3, and tools for working with
DNP3.
DNP3 Specifications
DNP3 is a feature-rich protocol with many ways to accomplish tasks. The
Interoperability section of IEEE 1815 defines four levels of subsets to help
improve interoperability. The levels are listed in Table 1 6. 1.
Table 16.1 DNP3 Implementation Levels
Level Description Equipment Types
1 Simple: limited communications requirements Meters, simple IEDs
2 Moderately complex: monitoring and metering
devices and multifunction devices that contain
more data
Protective relays, RTUs
3 Sophisticated: devices with great amounts of data
or complex communications requirements
Large RTUs, SCADA masters
4 Enhanced: additional data types and functionality
for more complex requirements
Large RTUs, SCADA masters
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