R.8.10
SEL-421 Relay Reference Manual Date Code 20111215
IEC 61850 Communications
IEC 61850 Operation
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 card.
Outgoing GOOSE messages are processed in accordance with the following
constraints:
➤ The user can define up to 8 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.
➤ High-speed GOOSE messaging (as defined under GOOSE
Performance on page R.8.11) is only available for CCOUTn
data.
➤ The SEL-421 will transmit all configured GOOSE immediately
upon successful initialization. If a GOOSE is not retriggered,
then following initial transmission, the SEL-421 will retransmit
that GOOSE on a curve. The curve begins at 4 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 50 ms is retransmitted at
intervals of 4 ms, 8 ms, 16 ms, 32 ms and 50 ms, then repeated
every 50 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 (12 ms,
24 ms, 48 ms, 96 ms and 100 ms for the example above. See
IEC 61850-8-1, sec. 18.1).
➤ GOOSE transmission is squelched (silenced) if the SEL-421
stops responding to the Ethernet card, or 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-421 will maintain the configuration of outgoing
GOOSE through a power cycle and device reset.
Incoming GOOSE messages are processed in accordance with the following
constraints:
➤ The user can configure the SEL-421 to subscribe to as many as
24 incoming GOOSE messages.
➤ Control bits in the SEL-421 get data from incoming GOOSE
messages which are mapped to CCINn bits. Note: MMS can
independently operate these bits.
➤ The SEL-421 will recognize incoming GOOSE messages as
valid based on the following content:
➢ Source broadcast MAC address.
➢ Dataset Reference
➢ Application ID
➢ GOOSE Control Reference
Any GOOSE message that fails these checks shall be rejected.
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