17.2
SEL-400 Series Relays Instruction Manual Date Code 20171006
IEC 61850 Communication
Introduction to IEC 61850
Introduction to IEC 61850
In the early 1990s, the Electric Power Research Institute (EPRI) and the Institute
of Electrical and Electronics Engineers, Inc. (IEEE) began to define a Utility
Communications Architecture (UCA). They initially focused on inter-control
center and substation-to-control center communications and produced the Inter-
Control Center Communications Protocol (ICCP) specification. This specifica-
tion, later adopted by the IEC as 60870-6 TASE.2, became the standard protocol
for real-time exchange of data between databases.
In 1994, EPRI and IEEE began work on UCA 2.0 for Field Devices (simply
referred to as UCA2). In 1997, they combined efforts with Technical Committee
57 of the IEC to create a common international standard. Their joint efforts cre-
ated the current IEC 61850 standard.
The IEC 61850 standard, a superset of UCA2, contains most of the UCA2 speci-
fication, plus additional functionality. The standard describes client/server and
peer-to-peer communications, substation design and configuration, testing, and
project standards.
The IEC 61850 standard consists of the parts listed in Table 17.1. These parts
were first published between 2001 and 2004, and they are often referred to as
IEC 61850 Edition 1 (Ed1). Selected parts of these standards were released in
2011 and tagged as Edition 2 (Ed2). Some SEL-400 series devices are compliant
with Ed2. Please refer to the product-specific manual to identify such devices.
It is possible and even likely, that an installation can have a mixture of devices
that conform to either Ed1 or Ed2. The standard supports backwards compatibil-
ity, i.e., Ed2 devices can send and receive messages to and from Ed1 devices.
However, there are important considerations to be made when adding Ed2
devices to an existing Ed1 system. Please refer to Potential Client and Automa-
tion Application Issues With Edition 2 Upgrades on page 17.54 for more infor-
mation.
Table 17.1 IEC 61850 Document Set (Sheet 1 of 2)
IEC 61850 Sections Definitions
IEC 61850-1 Introduction and overview
IEC 61850-2 Glossary
IEC 61850-3 General requirements
IEC 61850-4 System and project management
IEC 61850-5 Communication requirements
IEC 61850-6 Configuration description language for substation IEDs
IEC 61850-7-1 Basic communication structure for substations and feeder equipment—
Principles and models
IEC 61850-7-2 Basic communication structure for substations and feeder equipment—
Abstract communication service interface (ACSI)
IEC 61850-7-3 Basic communication structure for substations and feeder equipment—
Common data classes
IEC 61850-7-4 Basic communication structure for substations and feeder equipment—
Compatible logical node (LN) classes and data classes
IEC 61850-8-1 SCSM—Mapping to Manufacturing
Messaging Specification (MMS)
(ISO/IEC 9506-1 and ISO/IEC 9506-2 over ISO/IEC 8802-3)
IEC 61850-9-1 SCSM—Sampled values over serial multidrop point-to-point link
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