The GOOSE service model of IEC 61850-7-2 provides the possibility for fast and reliable
system-wide distribution of input and output data values. This implementation uses a
specific scheme of re-transmission to achieve the appropriate level of reliability. When a
GOOSE server generates a SendGOOSEMessage request, the current data set values are
encoded in a GOOSE message and transmitted on the multicast association. The event that
causes the server to invoke a SendGOOSE service is a local application issue as defined
in IEC 61850-7-2. Each update may generate a message in order to minimize throughput
time.
Additional reliability is achieved by re-transmitting the same data (with gradually
increasing SqNum and retransmission time).
T0
retransmission in stable conditions (no event for a long time)
(T0)
retransmission in stable conditions may be shortened by an event
T1
shortest retransmission time after the event
T2, T3
retransmission times until achieving the stable conditions time
Time of transmission
T0
(T0)
T1 T1 T2
T3
T0
event
IEC09000152-1-en.vsd
IEC09000152 V1 EN
Figure 11:
Transmission time for events
Each message in the retransmission sequence carries a timeAllowedToLive parameter
that informs the receiver of the maximum time to wait for the next re-transmission. If a
new message is not received within that time interval, the receiver assumes that the
association is lost. The specific intervals used by any GOOSE publisher are a local issue.
The timeAllowedtoLive parameter informs subscribers of how long to wait. In 650 series,
the detection time is 1.8*timeAllowedToLive to cope with possible transmission delays.
The GOOSE message concept is used for all application functions where two or more
IEDs are involved. Typical example is the station-wide interlocking procedure or breaker
failure protection.
1MRK 511 281-UUS A
Section 6
Data sets and control blocks
650 series ANSI
45
Communication protocol manual
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