GE P741

Symbols and Glossary
P74x/EN SG/N
a7
MiCOM P74
1, P742, P743
(SG) 14-
3
SG
Symbols Explanation
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.
I
∧
Current raised to a power:
Such as when breaker statistics monitor the square of ruptured current squared
(
∧
power = 2).
I/O Abbreviation of “Inputs and Outputs”:
Used in connection with the number of optocoupled inputs and output contacts within
the relay.
I/P
Abbreviation of “Input”.
I< An undercurrent element:
Responds to current dropout.
I> An overcurrent element:
Detects phase faults; Optionally used by the 50BF protection.
I>1 First stage of phase overcurrent protection:
Could be labelled 51-1 in ANSI terminology.
I>2 Second stage of phase overcurrent protection:
Could be labelled 51-2 in ANSI terminology.
I>3 Third stage of phase overcurrent protection:
Could be labelled 51-3 in ANSI terminology.
I>4 Fourth stage of phase overcurrent protection:
Could be labelled 51-4 in ANSI terminology.
I>BB
Minimum pick-up phase threshold for the local trip order confirmation.
I>DZ
Minimum pick-up phase threshold for the Dead Zone protection.
I
0
Zero sequence current:
Equals one third of the measured neutral/residual current.
I
1
Positive sequence current.
I
2
Negative sequence current.
IA Phase A current:
Might be phase L1, red phase. or other, in customer terminology.
IB Phase B current:
Might be phase L2, yellow phase. or other, in customer terminology.
IbiasPh>
Cur.
SDEF blocking bias current threshold.
IC Phase C current:
Might be phase L3, blue phase. or other, in customer terminology.
ID Abbreviation of “Identifier”:
Often a label used to track a software version installed.
ID>1
Minimum pick-up phase circuitry fault threshold.