Generic Object Oriented Substation Events
Generic Object Oriented Substation Events ( GOOSE ) is a real-time capable network protocol for controlling devices via Ethernet - networks . It is conceptually described by the International Electrotechnical Commission (IEC) in the standard IEC 61850 in part 7-1 and specified in part 8-1.
GOOSE sends messages about the status of a device regularly at a fixed interval (e.g. every second). If the status of an element in the GOOSE's so-called dataset changes, the repetition interval changes and the message is transmitted more often. The repetition interval is extended until it has reached the original value again. The GOOSE messages are sent via multicast , i. This means that several receivers can be informed of the status of one transmitter at the same time.
A typical application of GOOSE is the spontaneous transmission of status changes of switching devices (e.g. switch position on / off) or other status messages in switchgear that have to be sent to all network participants. The advantage of device control via Ethernet compared to a classic direct device-to-device connection lies in the free configuration of the devices connected to the network. No new cables have to be laid for new send and receive relationships. The spread of Ethernet and the possibility of using Ethernet for other services are further reasons for using this technology. GOOSE are now also used for protective functions (rear locking, breaker failure protection).
GOOSE datagrams set their own Ethertype (0x88b8) in Ethernet packets, whereby prioritizations are mapped directly on the Ethernet data link layer (see also IEEE 802.1Q ). The prioritization means that the datagrams are given priority over IP packets in network switches, so that the delay in the network is as low as possible and the recipients can reach GOOSE messages while observing a time window. Nevertheless, delays in networks are possible and measurable. This protocol structure enables the real-time capability of GOOSE. GOOSE datagrams can be limited to certain segments of the network by VLANs , but in current implementations only the priority in the VLAN tag is used as far as possible (VLAN ID = 0).
Individual evidence
- ^ A b Walter and Thomas Schossig, Rolf Rüdiger Cichowski (eds.): Netzschutztechnik, 5th edition. EW Medien und Kongresse GmbH, Frankfurt am Main and VDE-Verlag, Berlin 2016, ISBN 978-3-8022-1137-9 and ISBN 978-3-8007-3927-1 .
- ↑ http://standards.ieee.org/develop/regauth/ethertype/eth.txt
- ↑ https://www.omicron.at/fileadmin/user_upload/pdf/papers/2014-08-PotM-Assessing-IEC-61850-communication-network-ENU.pdf ( page no longer available , search in web archives ) Info: The link was automatically marked as broken. Please check the link according to the instructions and then remove this notice.
- ↑ Archived copy ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
