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E154713
C-5
C: Using the IEC61850 Protocol Ethernet Network Server
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
C.1.1.2: Publisher/Subscriber Communication (GOOSE)
There is an additional, essential relationship in IEC 61850, known as publisher and
subscriber, which is the method used in GOOSE messaging. The publisher/subscriber
relationship differs from the client/server in that there is no explicit one-to-one rela-
tionship between the information producer and consumer. Publishers issue data with-
out knowledge of which devices will consume the data, and whether the data has
been received. Subscribers use internal means to access the published data. From the
viewpoint of IEC 61850, the publisher/subscriber mechanism uses the Ethernet multi-
cast mechanism (i.e., multicast MAC addresses at layer 2). The communication layer
of the system is responsible for transmitting this information to all interested sub-
scribers and the subscribers are responsible for accepting these multicast packets
from the Ethernet layer.
The publish/subscribe mechanism is used both for GOOSE and Sampled Value
services. GOOSE is fully supported by the Nexus® 1500+ meter’s IEC 61850 Protocol
Ethernet Network server. In addition, the Nexus® 1500+ meter adds a unique,
powerful implementation to GOOSE, by using it to send alarm/limit messages that
trigger waveforms whenever there is a power quality event. In this way, if there is a
power anomaly, there will be multiple captures of the event so that a detailed analysis
can be performed. See Section C.1.4.2: GOOSE on page C-15, for information on the
Nexus® 1500+ meter’s GOOSE implementation.
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