F.5
Date Code 20170927 Instruction Manual SEL-751 Relay
IEC 61850 Communications
IEC 61850 Operation
Settings files, event files and reports are also available through MMS. See File
Transfer Protocol (FTP) and MMS File Transfer on page 7.13, Retrieving
COMTRADE Event Files on page 10.29, and Retrieving Event Reports Via
Ethernet File Transfer on page 10.18.
If MMS authentication is enabled, the device authenticates each MMS
association by requiring the client to provide the password authentication
parameter with a value that is equal to the 2AC password of the SEL-751.
➤ If the correct password authentication parameter is not
received, the device returns a not authenticated error code.
➤ If the correct password authentication parameter value is
received, the device gives a successful association response.
Once an authenticated association is established, the device allows access to
all supported MMS services for that association.
GOOSE
The Generic Object Oriented Substation Event (GOOSE) object within IEC
61850 is for high-speed control messaging. IEC 61850 GOOSE automatically
broadcasts messages containing status, controls, and measured values onto the
network for use by other devices. IEC 61850 GOOSE sends the messages
several times, increasing the likelihood that other devices receive the
messages.
IEC 61850 GOOSE objects can quickly and conveniently transfer status,
controls, and measured values between peers on an IEC 61850 network.
Configure SEL devices to respond to GOOSE messages from other network
with Architect software. Also, configure outgoing GOOSE messages for SEL
devices in Architect. See the Architect online help for more information.
Each IEC 61850 GOOSE sender includes a text identification string (GOOSE
Control Block Reference) in each outgoing message and an Ethernet multicast
group address. Devices that receive GOOSE messages use the text
identification and multicast group to identify and filter incoming GOOSE
messages.
Virtual bits (VB001–VB128) are control inputs that you can map to GOOSE
receive messages by using the Architect software. See the VBnnn bits in
Table F.15 for details on which logical nodes and names are used for these
bits. This information can be useful when searching through device data with
MMS browsers. If you intend to use any SEL-751 virtual bits for controls, you
must create SEL
OGIC control equations to define these operations. The Virtual
Bit Logical Nodes only contain Virtual Bit status, and only those Virtual Bits
that are assigned to an SER report are able to track bit transitions (via
reporting) between LN data update scans.
The relay is capable of receiving analog values via peer-to-peer GOOSE
messages. Remote Analogs (RA001–RA128) are analog inputs that you can
map to values from incoming GOOSE messages.
File Services
The Ethernet file system allows reading or writing data as files. The file
system supports FTP and MMS file transfer. The file system provides:
➤ A means for the devices to transfer data as files
➤ A hierarchical file structure for the device data
NOTE: Virtual bits and remote
analogs mapped to GOOSE
subscriptions retain their state until
they are overwritten, a new CID file is
loaded, or the device is restarted. To
reset the virtual bits and remote
analogs by restarting the device,
issue an STA C command or remove
and then restore power to the device.
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