F.10
SEL-787 Relay Instruction Manual Date Code 20081022
IEC 61850 Communications
IEC 61850 Operation
➤ The SEL-787 will transmit all configured GOOSE immediately
upon successful initialization. If a GOOSE is not retriggered,
then, following initial transmission, the SEL-787 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-787 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-787 to subscribe to as many as
16 incoming GOOSE messages.
The SEL-787 will recognize incoming GOOSE messages as
valid based on the following content. Any GOOSE message
that fails these checks shall be rejected.
➢ Source broadcast MAC address
➢ Dataset Reference
➢ Application ID
➢ GOOSE Control Reference
➤ Rejection of all DA contained in an incoming GOOSE, based
on the accumulation of the following error indications created
by inspection of the received GOOSE:
➢ Configuration Mismatch: the configuration number of
the incoming GOOSE changes.
➢ Needs Commissioning: this Boolean parameter of the
incoming GOOSE is true.
➢ Test M od e: this Boolean parameter of the incoming
GOOSE is true.
➢ Decode Error: the format of the incoming GOOSE is
not as configured.
➤ The SEL-787 will discard incoming GOOSE under the
following conditions:
➢ after a permanent (latching) self-test failure
➢ when EGSE is set to No
Link-layered priority tagging and virtual LAN is supported as described in
Annex C of IEC 61850-8-1:2004(E).
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