Siemens SIPROTEC 5 Manual page 478

Glossary
Folder
This object type helps when structuring a project hierarchically.
Function block
A block that can perform one specific task or function.
Function group
Functions are brought together into function groups (FG). The assignment of functions to current and/or
voltage transformers (assignment of functions to measuring points), the information exchange between the
function groups via interfaces as well as the generation of group indications are important for this bringing
together.
General interrogation
The state of all process inputs, of the status and of the error image are scanned on system startup. This infor-
mation is used to update the system-side process image. Likewise, the current process state can be interro-
gated after data loss with a general interrogation (GA).
Generic Object-Oriented Substation Event
GOOSE. Protocol of IEC 61850 for communication between bay units.
GI
See General Interrogation
Global Positioning System
Satellites with atomic clocks orbit the earth twice a day at a height of about 20 000 km. They emit signals
which contain the GPS universal time with other data. The GPS receiver determines its own position from the
signals received. It can derive the propagation runtime of a satellite's signal from this position and hence
correct the emitted GPS universal time.
GOOSE
See Generic Object-Oriented Substation Event.
GPS
See Global Positioning System
Ground
The conductive ground whose electric potential can be set equal to 0 at every point. In the area of grounding
conductors, the ground can have a potential diverging from 0. The term reference ground is also used for
this situation.
Grounding
The grounding is the entirety of all means and measuring for grounding.
Hierarchy level
In a structure with superordinate and subordinate objects, a hierarchy level is a level of equal-ranking objects.
HSR protocol
Like PRP (Parallel Redundancy Protocol), HSR (High Availability Seamless Redundancy Protocol) is specified in
IEC 62439-3. Both protocols offer redundancy without switching time. The principal function can be found in
the definition of PRP. With PRP, the same message is sent via 2 separated networks. In contrast to this, in the
478 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017