F.2
SEL-751A Relay Instruction Manual Date Code 20100129
IEC 61850 Communications
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
specification, 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 created the current IEC 61850 standard.
The IEC 61850 standard, a superset of UCA2, contains most of the UCA2
specification, 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 F.1.
The IEC 61850 document set, available directly from the IEC at
http://www.iec.ch, contains information necessary for successful
implementation of this protocol. SEL strongly recommends that anyone
involved with the design, installation, configuration, or maintenance of IEC
61850 systems be familiar with the appropriate sections of these documents.
Ta b le F.1 IEC 6 18 5 0 Do c u m e nt S e t
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 equip-
ment-Principles and models
IEC 61850-7-2 Basic communication structure for substations and feeder equip-
ment—Abstract Communication Service Interface (ACSI)
IEC 61850-7-3 Basic communication structure for substations and feeder equip-
ment-Common data classes
IEC 61850-7-4 Basic communication structure for substations and feeder equip-
ment—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
IEC 61850-9-2 SCSM-Sampled values over ISO/IEC 8802-3
IEC 61850-10 Conformance testing
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