F.9
Date Code 20100129 Instruction Manual SEL-751A Relay
IEC 61850 Communications
IEC 61850 Operation
For example, if the device becomes disabled, as shown via status indications
(e.g., an internal self-test failure), the SEL-751A will set the Validity attribute
to invalid and the Failure attribute to TRUE. Note that the SEL-751A does not
set any of the other quality attributes. These attributes will always indicate
FALSE (0). See the
ACSELERATOR Architect online help for additional
information on GOOSE Quality attributes.
Figure F.3 GOOSE Quality
GOOSE Processing
SEL devices support GOOSE processing as defined by IEC 61850-7-1:2003(E),
IEC 61850-7-2:2003(E), and IEC 61850-8-1:2004(E) via the installed
Ethernet port. Outgoing GOOSE messages are processed in accordance with
the following constraints:
➤ The user can define up to eight outgoing GOOSE messages
consisting of any Data Attribute (DA) from any logical node. A
single DA can be mapped to one or more outgoing GOOSE, or
one or more times within the same outgoing GOOSE. A user
can also map a single GOOSE dataset to multiple GOOSE
control blocks.
➤ The SEL-751A will transmit all configured GOOSE
immediately upon successful initialization. If a GOOSE is not
retriggered, then, following initial transmission, the SEL-751A
will retransmit that GOOSE on a curve. The curve begins at 10
ms and doubles for each retransmission until leveling at the
maximum specified in the CID file for that GOOSE. For
example, a message with a maximum retransmit interval of 100
ms is retransmitted at intervals of 10 ms, 20 ms, 40 ms, 80 ms,
and 100 ms, then repeated every 100 ms until a trigger causes
the transmission sequence to be repeated. The time-to-live
reported in each transmitted message, is three times the current
interval, or two times the interval, if the maximum time-to-live
has been reached (30 ms, 60 ms, 120 ms, 240 ms, and 200 ms
for the example above; see IEC 61850-8-1, sec. 18.1).
➤ GOOSE transmission is squelched (silenced) after a permanent
(latching) self-test failure.
➤ Each outgoing GOOSE includes communication parameters
(VLAN, Priority, and Multicast Address) and is transmitted
entirely in a single network frame.
➤ The SEL-751A will maintain the configuration of outgoing
GOOSE through a power cycle and device reset.
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