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10.
IEC 61850 PROTOCOL
This section describes the implementation of IEC 61850 protocol.
IEC 61850 protocol defines a way of structuring the available information in each device,
that is reflected in the Data Model and a way of managing and sending this information
through communications using specific Services.
SILG device will be known as a Server IED (Intelligent Electronic Device), which services
will be available using the Ethernet through its default IP (192.168.0.121)
MMS will be the used Ethernet protocol for the Client-Server communication and 102 will
be the used port.
GOOSE fast messages is not a Client-Server communication like TCP/IP but a Multicast
communication that sends messages directly to the Link Layer using MAC directions as
destination directions for publishing the GOOSE.
10.1. Data model
Server IEDs have all the information of all their events, measures, parameters and
services, organized in a hierachical structure with device’s functional units as main ones.
The main level of the structure is the name of the IED, by default TEMPLATE, with its
instance LD1
Down the IED there are Logical Nodes that represent the functional units of the IED
(Protection, Control and measure units, status of external elements like circuit breaker,
etc.)
Inside Logical Nodes there are Data objects that compose a functional unit, and inside
each Data object, there are Data attributes that give complete information about this Data
object.
As example, the ground overvoltage protection unit is represented in SIL-V according IEC
61850 as the logical node PTOV, with the prefix GND and the instance 1: GNDPTOV1
In the Logical Node, the starting of the unit is represented by its Data Object, Str , with a list
of Data Attributes that give information about the starting:
Attribute neut indicates the status of the starting, t attribute indicates the time stamp when
the starting has changed, etc.