Glossary
686
7SD5 Manual
C53000-G1176-C169-1
image. The current process state can also be sampled after a data loss by means of
a GI.
GOOSE messages The GOOSE messages (Generic Object Oriented Substation Event) are data packag-
es which are transmitted event-controlled via the Ethernet communication system.
They are used for a direct information exchange between devices. This mechanism
enables the cross-communication between bay units.
GPS Global Positioning System. Satellites with atomic clocks on board orbit the earth twice
a day in different parts in approx. 20,000 km. They transmit signals which also contain
the GPS universal time. The GPS receiver determines its own position from the
signals received. From its position it can derive the running time of a satellite and thus
correct the transmitted GPS universal time.
Hierarchy level Within a structure with higher-level and lower-level objects a hierarchy level is a con-
tainer of equivalent objects.
HV field description The HV project description file contains details of fields which exist in a ModPara-
project. The actual field information of each field is memorized in a HV field description
file. Within the HV project description file, each field is allocated such a HV field de-
scription file by a reference to the file name.
HV project descrip-
tion
All the data is exported once the configuration and parameterisation of PCUs and sub-
modules using ModPara has been completed. This data is split up into several files.
One file contains details about the fundamental project structure. This also includes,
for example, information detailing which fields exist in this project. This file is called a
HV project description file.
ID Internal double point indication → Double-point indication
ID_S Internal double point indication intermediate position 00, → Double-point indication
IEC International Electrotechnical Commission
IEC address Within an IEC bus a unique IEC address has to be assigned to each SIPROTEC 4
device. A total of 254 IEC addresses are available for each IEC bus.
IEC communication
branch
Within an IEC communication branch the users communicate on the basis of the
IEC60-870-5-103 protocol via an IEC bus.
IEC61850 International communication standard for communication in substations. The objective
of this standard is the interoperability of devices from different manufacturers on the
station bus. An Ethernet network is used for data tranfer.
Initialization string An initialization string comprises a range of modem-specific commands. These are
transmitted to the modem within the framework of modem initialization. The com-
mands can, for example, force specific settings for the modem.
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