Communication Profiles; Tcp Connection Timing; Mms Protocol; Peer-To-Peer Communication - GE F650 Instruction Manual

7.2 IEC 61850 PROFILE FOR F650 7 IEC 61850 PROTOCOL
From a system perspective, there is a significant amount of configuration that is required in order to put all the pieces
together and have them work. In order to facilitate this process and to eliminate much of the human error component, an
XML based Substation Configuration Language (SCL) was defined in part 6. It allows the formal description of the relations
between the substation automation system and the substation. At the application level, the substation topology itself and
the relation of the substation structure to the SAS functions (logical nodes) configured on the IEDs can be described. Each
device must provide an SCL file that describes the configuration of itself.
Finally, part 10 defines a testing methodology in order to determine "conformance" with the numerous protocol definitions
and constraints defined in the standard.

7.2.2 COMMUNICATION PROFILES

The F650 relay supports IEC61850 server services over TCP/IP. This profile requires the F650 to have an IP address to
establish communications. It is possible to have up to five simultaneous connections.

7.2.3 TCP CONNECTION TIMING

A built-in TCP/IP connection timeout of 30 seconds is employed by the F650 to detect "dead" connections. If there is no
data traffic on a TCP connection for greater than 30 seconds, the connection will be aborted by the server. Therefore, when
using IEC61850 reporting, clients should configure report control block items such that an integrity report will be issued al
least every 30 seconds. If other MMS data is being polled on the same connection al least once every 30 seconds, this
timeout will not apply.

7.2.4 MMS PROTOCOL

IEC 61850 specifies the use of the Manufacturing Message Specification (MMS) at the upper (application) layer for transfer
of real-time data. This protocol has been in existence for a number of years and provides a set of services suitable for the
transfer of data within a substation LAN environment. Actual MMS protocol services are mapped to IEC 61850 abstract ser-
vices in IEC 61850-8-1.
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The exact structure and values of the supported IEC61850 logical nodes can be seen by connecting to a F650 relay with an
MMS browser, such as "MMS Object Explorer and AXS4-MMS" DDE/OPC server from Sisco Inc.

7.2.5 PEER-TO-PEER COMMUNICATION

Peer-to-peer communication of a digital state information (remote inputs/outputs) is supported using the IEC61850
GOOSE/GSE services. This feature allows digital points to be exchanged between IEC 61850 conforming devices.

7.2.6 FILE SERVICES

MMS file services are supported to allow transfer of oscillography, event record, or other files from a F650 relay.
7-8 F650 Digital Bay Controller GEK-106310AB