P341/EN AD/F43 Update Documentation
(AD) -38
MiCOM P341
The levels of this hierarchy can be described as follows:
Physical Device – 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).
Logical Device – Identifies groups of related Logical Nodes
within the Physical Device. For the MiCOM
relays, 5 Logical Devices exist: Control,
Measurements, Protection, Records,
System.
Wrapper/Logical Node Instance – 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, stage 2).
Data Object – 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.
Data Attribute – 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.
9.3 IEC 61850 in MiCOM relays
IEC 61850 is implemented in MiCOM relays by use of a separate Ethernet card. This card
manages the majority of the IEC 61850 implementation and data transfer to avoid any
impact on the performance of the protection.
In order 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 PACiS computer (MiCOM C264) or
HMI, or
An “MMS browser”, with which the full data model can be retrieved from the IED, without
any prior knowledge
9.3.1 Capability
The IEC 61850 interface provides the following capabilities:
Read access to measurements
All measurands are presented using the measurement Logical Nodes, in the
‘Measurements’ Logical Device. Reported measurement values are refreshed by
the relay once per second, in line with the relay user interface.
Generation of unbuffered reports on change of status/measurement
Unbuffered reports, when enabled, report any change of state in statuses and/or
measurements (according to deadband settings).
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