UNIGEAR DIGITAL
IEC 6185 0
1VLG5 00007 E
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2.3
IEC 61850
The IEC 61850 standard was released in 2004 as a global international standard representing
the architecture for communication networks and systems for power utility automation.
The IEC 61850 standard defines the Ethernet technology for substation automation commu-
nication. It also includes the related system requirements and the data model of the protec-
tion and control functions. The standardized data modelling of substation functions includ-
ing the communication interfaces pave the way to openness and interoperability of devices.
The IEC 61850 standard distinguishes Station bus IEC 61850-8-1 with vertical and horizontal
GOOSE communication (real time communication between protection relays) and Process
bus IEC 61850-9-2 for transmission of Sampled Measured Values (SMV) gathered by measure-
ments. The UCA International Users Group created a guideline (commonly referred to as
IEC 61850-9-2LE where “LE” stays for “Lite Edition”) that defines an application profile of
IEC 61850-9-2 to facilitate implementation and enable interoperability
.
The Station and Process busses can be physically separated or they can coexist on the same
Ethernet network. The GOOSE and SMV profiles enable designing substation communication
for MV switchgear in a novel and flexible way to make the protection relay process data
available to all other protection relays in the local network in a real-time manner.
Protection relays publish signals for interlocking, blocking, tripping between panels via hori-
zontal GOOSE communication in UniGear Digital. Nowadays, GOOSE communication is used
increasingly in substations and it offers new additional values like simplicity, functional
flexibility, easy scalability and improved diagnostic, faster performance compared to
conventional hard wired interpanel wires.
Figure 22: Switchgear with sensor measurement
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