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IEC 61850 Protocols Used in Protective Relays Communication Chapter | 17 183

17.2.1.3 Communication in IEC 61850
The services and protocols used for communicating under IEC 61850 are:
Sampled value service
Goose service (GOOSE)
Simple network time protocol
Manufacturer message specification (MMS)
User datagram protocol
Transport control protocol
Internet protocol
Each physical device can be a “publisher”, that is, create information,
and send it using abstract communication services interface (ACSI) commu-
nication to other physical devices that are nominated as “subscribers.” These
ACSI communications can be in the form of GOOSE messages or generic
substation event (GSE).
MMS defines the communication messages between controllers and
between engineering stations and controllers (downloading and application
or reading/writing variables).

17 .2.1.4 Transport Profile
The above are the different services used for communication in IEC 61850.
The data and services of an application can be classified in the following
levels:
Abstract communication service interface (ACSI) the mechanism of com-
munication services.
Common data class.
Compatible addressing of logical nodes and data objects.

17.2.1.5 Bus Topology
This can be one of the following configurations:

Single and double star topology
Single and double tree topology
Mesh topology
Ring topology

17.2.2 Substation Configuration Language

IEC 61850-6-1 specifies a substation configuration language (SCL) that is
based upon eXtensible Markup Language (XML) to describe a system
configuration. SCL specifies a hierarchy of configuration files that enable
multiple levels of the system to be described in standardized XML files. The
various SCL files include system specification description (SSD), IED
capability description (ICD), substation configuration description (SCD), and