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Chapter 17 - Communications
The IEC 61850 compatible interface standard provides capability for the following:
Read access to measurements
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Refresh of all measurements at the rate of once per second.
Generation of non-buffered reports on change of status or measurement
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SNTP time synchronization over an Ethernet link. (This is used to synchronize the IED's internal real time
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clock.
GOOSE peer-to-peer communication
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Disturbance record extraction by file transfer. The record is extracted as an ASCII format COMTRADE file
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Controls (Direct and Select Before Operate)
Note:
Setting changes are not supported in the current IEC 61850 implementation. Currently these setting changes are carried out
using the settings application software.
7.4.5
IEC 61850 DATA MODEL IMPLEMENTATION
The data model naming adopted in the IEDs has been standardised for consistency. Therefore the Logical Nodes
are allocated to one of the five Logical Devices, as appropriate.
The data model is described in the Model Implementation Conformance Statement (MICS) document, which is
available as a separate document.
7.4.6
IEC 61850 COMMUNICATION SERVICES IMPLEMENTATION
The IEC 61850 communication services which are implemented in the IEDs are described in the Protocol
Implementation Conformance Statement (PICS) document, which is available as a separate document.
7.4.7
IEC 61850 PEER-TO-PEER (GOOSE) COMMUNICATIONS
The implementation of IEC 61850 Generic Object Oriented Substation Event (GOOSE) enables faster
communication between IEDs offering the possibility for a fast and reliable system-wide distribution of input and
output data values. The GOOSE model uses multicast services to deliver event information. Multicast messaging
means that messages are sent to selected devices on the network. The receiving devices can specifically accept
frames from certain devices and discard frames from the other devices. It is also known as a publisher-subscriber
system. When a device detects a change in one of its monitored status points it publishes a new message. Any
device that is interested in the information subscribes to the data it contains.
7.4.8
MAPPING GOOSE MESSAGES TO VIRTUAL INPUTS
Each GOOSE signal contained in a subscribed GOOSE message can be mapped to any of the virtual inputs within
the PSL. The virtual inputs allow the mapping to internal logic functions for protection control, directly to output
contacts or LEDs for monitoring.
An IED can subscribe to all GOOSE messages but only the following data types can be decoded and mapped to a
virtual input:
BOOLEAN
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BSTR2
INT16
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INT32
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INT8
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402
P54A/B/C/E
P54xMED-TM-EN-1
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