Glossary
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
152
DP
Double-point indication
DP_I
Double point indication, intermediate position 00
Electromagnetic compatibility
Electromagnetic compatibility (EMC) is the ability of an electrical apparatus to function fault-free in a specified
environment without influencing the environment unduly.
EMC
Electromagnetic compatibility
ExBPxx
External bit pattern indication via an ETHERNET connection, device-specific
Bit pattern indication
General interrogation (GI)
During the system start-up the state of all the process inputs, of the status and of the fault image is sampled.
This information is used to update the system-end process image. The current process state can also be
sampled after a data loss by means of a GI.
GOOSE message
GOOSE messages (Generic Object Oriented Substation Event) in accordance with IEC 61850 are data pack-
ages that are transmitted cyclically and event-controlled via the Ethernet communication system. They serve
for direct information exchange among the relays. This mechanism facilitates cross-communication between
bay devices.
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 de-
termines 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.
Ground
The conductive ground whose electric potential can be set equal to zero in any point. In the area of ground
electrodes the ground can have a potential deviating from zero. The term "Ground reference plane" is often
used for this state.
Grounding
Grounding means that a conductive part is to connect via a grounding system to
ground.
Grounding
Grounding is the total of all means and measured used for grounding.
