Iec 61850 Interoperability; The Iec 61850 Data Model; Figure 158: Data Model Layers In Iec61850 - GE P24DM Technical Manual

Chapter 16 - Communications
Ethernet, which is becoming more and more widely used in substations, in favour of RS485. Using Ethernet in the
substation offers many advantages, most significantly including:
Ethernet allows high-speed data rates (currently 100 Mbps, rather than tens of kbps or less used by most
●
serial protocols)
Ethernet provides the possibility to have multiple clients
●
Ethernet is an open standard in every-day use
●
There is a wide range of Ethernet-compatible products that may be used to supplement the LAN installation
●
(hubs, bridges, switches)
6.5.2

IEC 61850 INTEROPERABILITY

A major benefit of IEC 61850 is interoperability. IEC 61850 standardizes the data model of substation IEDs, which
allows interoperability between products from multiple vendors.
An IEC 61850-compliant device may be interoperable, but this does not mean it is interchangeable. You cannot
simply replace a product from one vendor with that of another without reconfiguration. However the terminology
is pre-defined and anyone with prior knowledge of IEC 61850 should be able to integrate a new device very quickly
without having to map all of the new data. IEC 61850 brings improved substation communications and
interoperability to the end user, at a lower cost.
6.5.3

THE IEC 61850 DATA MODEL

The data model of any IEC 61850 IED can be viewed as a hierarchy of information, whose nomenclature and
categorization is defined and standardized in the IEC 61850 specification.
V01008
Figure 158: Data model layers in IEC 61850
The levels of this hierarchy can be described as follows:
Data Frame format
Layer
Physical Device
Logical Device
352
stVal q
Pos
LN1: XCBR
Logical Device : IEDs 1 to n
Physical Device (network address)
Identifies the actual IED within a system. Typically the device's name or IP address can be used (for
example Feeder_1 or 10.0.0.2.
Identifies groups of related Logical Nodes within the Physical Device. For the MiCOM IEDs, 5 Logical
Devices exist: Control, Measurements, Protection, Records, System.
Data Attributes
t PhA
Data Objects
Logical Nodes : 1 to n
LN2: MMXU
Description
PhB PhC
A
P24xM
P24xM-TM-EN-2.1