PRS-7910
30 PRS-7910
communication activity is controlled by the client. IEC61850 clients are often substation computers
running HMI programs or SOE logging software. Servers are usually substation equipment such
as protection relays, meters, RTUs, transformer, tap changers, or bay controllers.
3. Peer-to-peer
This is a non-connection-oriented, high speed type of communication usually between substation
equipment, such as protection relays, intelligent terminal. GOOSE is the method of peer-to-peer
communication.
4. Substation configuration language (SCL)
A substation configuration language is a number of files used to describe IED configurations and
communication systems according to IEC 61850-5 and IEC 61850-7. Each configured device has
an IED Capability Description (ICD) file and a Configured IED Description (CID) file. The
substation single line information is stored in a System Specification Description (SSD) file. The
entire substation configuration is stored in a Substation Configuration Description (SCD) file. The
SCD file is the combination of the individual ICD files and the SSD file, moreover, add
communication system parameters (MMS, GOOSE, control block, SV control block) and the
connection relationship of GOOSE and SV to SCD file.
9.4.3 MMS Communication Network Deployment
In order to enhance the stability and reliability of SAS, dual-MMS Ethernet is widely adopted. This
section is applied to introduce the details of dual-MMS Ethernet technology. Generally,
single-MMS Ethernet is recommended to be adopted in the SAS of 110kV and lower voltage levels,
while dual-MMS Ethernet is recommended to be adopted in the SAS of voltage levels above
110kV.
Client-server mode is adopted: clients (SCADA, control center and etc.) communicate with the
IEDs via MMS communication network, and the IEDs operate as the servers. IEDs are connected
to clients passively, and they can interact with the clients according to the configuration and the
issued command of the clients.
Three modes for dual-MMS Ethernet (abbreviated as dual-net) are provided as below.
NOTICE!
Hereinafter, the normal operation status of net means the physical link and TCP link are
both ok. The abnormal operation status of net means physical link or TCP link is
broken.
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