Iec 61850 In Micom Relays; Capability - GE MiCOM P40 Agile Technical Manual

P44x/EN SC/Hb6
(SC) 12-40
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Physical Device
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Logical Device
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Wrapper/Logical Node Instance – Identifies the major functional areas within the
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Data Object
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Data Attribute
6.3

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
6.3.1

Capability

The IEC 61850 interface provides the following capabilities:
1. 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.
2. 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).
3. Support for time synchronization over an Ethernet link
Time synchronization is supported using SNTP (Simple Network Time Protocol); this
protocol is used to synchronize the internal real time clock of the relays.
4. GOOSE peer-to-peer communication
GOOSE communications of statuses are included as part of the IEC 61850
implementation.Please see section 6.6 for more details.
5. Disturbance record extraction
Extraction of disturbance records, by file transfer, is supported by the MiCOM relays.
– Identifies the actual IED within a system. Typically t
the device's name or IP address can be used (for e
example Feeder_1 or 10.0.0.2).
– Identifies groups of related Logical Nodes within t
the Physical Device. For the MiCOM relays, 5 Logi
Logical Devices exist: Control, Measurements,
Protection, Records, System.
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).
– 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.
SCADA Communications
MiCOM P40 Agile P442, P444