Iec 61850 In Micom Ieds; Figure 282: Data Model Layers In Iec61850 - GE MiCOM P40 Technical Manual

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Table of Contents

Chapter 21 - Communications

Figure 282: Data model layers in IEC 61850

The levels of this hierarchy can be described as follows:

Data Frame format

Physical Device

Logical Device

Wrapper/Logical Node Instance

Data Attribute

IEC 61850 IN MICOM IEDS

IEC 61850 is implemented by use of a separate Ethernet card. This Ethernet card manages the majority of the

IEC 61850 implementation and data transfer to avoid any impact on the performance of the protection functions.

To communicate with an IEC 61850 IED on Ethernet, it is necessary only to know its IP address. This can then be

configured into either:

An IEC 61850 client (or master), for example a bay computer (MiCOM C264)

An MMS browser, with which the full data model can be retrieved from the IED, without any prior knowledge

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.

Identifies the major functional areas within the IEC 61850 data model. Either 3 or 6 characters are

used as a prefix to define the functional group (wrapper) while the actual functionality is identified by

a 4 character Logical Node name suffixed by an instance number.

For example, XCBR1 (circuit breaker), MMXU1 (measurements), FrqPTOF2 (overfrequency protection,

This next layer is used to identify the type of data you will be presented with. For example, Pos

(position) of Logical Node type XCBR.

This is the actual data (measurement value, status, description, etc.). For example, stVal (status value)

indicating actual position of circuit breaker for Data Object type Pos of Logical Node type XCBR.

Data Attributes

Data Objects

Logical Nodes : 1 to n

P446SV-TM-EN-1