ABB IEC 61850 Edition 2 Communication Protocol Manual page 50

Section 6
Data sets and control blocks
44
A GOOSE message is forced to be transmitted when a trigger change is detected
for a data attribute. All members of the data set are copied in the send buffer with
their actual value and the message is sent. The subscribers, who knows the address
of this GOOSE message, receives the telegram. The GOOSE message includes a
sequence number to verify that all messages are received.
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Communication protocol manual