A communication model part of the IEC 61850 standard (power systems). GOOSE messages are a mechanism for very fast, event-driven communication in electrical substations (for example, to trip breakers or signal alarms). They are multicast messages that can convey a change of state (like “Breaker open!”) with extremely low latency, replacing old hard-wired inter-relays. While this term is power-industry-specific, it’s good to know since modern substations now use GOOSE over Ethernet to react to faults in milliseconds.
