GE P444

P
44x/EN SG/ Hb6
Symbols and Glossary
(SG) 1
3-4 MiCO
M P40 Agile P442, P444
Symbols Explanation
CsZ1 Carrier sent by Z1
CT Current transformer.
CTRL. Abbreviation of “Control”:
As used for the Control Inputs function.
CTS Current transformer supervision (to detect CT input failure.)
CVMR Start and Convergency
CVT Capacitive Voltage Transformer supervision (Voltage dividers capacitors failure.)
CZ Abbreviation of “Check Zone”:
Zone taking into account only the feeders.
DDB
Digital data bus within the programmable scheme logic: A logic point that has a zero or 1 status.
DDB signals are mapped in logic to customize the relay’s operation.
DEF Directional earth fault protection: A directionalised ground fault aided scheme.
Df/dt Rate of change of frequency protection (ROCOF).
Dly Time delay.
DNP Distributed Network Protocol
DR Abbreviation of “Disturbance Record”
DT Abbreviation of “Definite Time”:
An element which always responds with the same constant time delay on operation.
DZ Abbreviation of “Dead Zone”:
Area between a CT and an open breaker or an open isolator.
E/F Earth fault:
Directly equivalent to ground fault.
F< An underfrequency element:
Could be labelled 81U in ANSI terminology.
F> An overfrequency element:
Could be labelled 81O in ANSI terminology.
FLC Full load current:
The nominal rated current for the circuit.
Flt. Abbreviation of “Fault”:
Typically used to indicate faulted phase selection.
FN Function.
FSK Frequency Shift Keyed
Fwd. Indicates an element responding to a flow in the “Forward” direction.
GN> Neutral over conductance protection element:
Real component of admittance calculation from neutral current and residual voltage.
Gnd. Abbreviation of “Ground”:
Used in distance settings to identify settings that relate to ground (earth) faults.
GOOSE Generic Object Oriented Substation Event:
In IEC 61850, a specific definition of a type of generic substation event, for peer-peer
communication.
GRP. Abbreviation of “Group”:
Typically an alternative setting group.
GSE Generic Substation Event:
In IEC 61850, the generic substation event model provides the possibility for a fast and reliable
system-wide distribution of input and output data values (peer-peer communication).
HMI Human Machine Interface:
The graphical user interface of the control system.
I Current.