scheider electric MiCOM P746, Technical Manual

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Symbols and Glossary P746/EN SG/F21
MiCOM P746 (SG) 14-
3
SG
Symbols Explanation
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.
I2> Negative sequence overcurrent protection (NPS element).
I2pol Negative sequence polarizing 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.
ID>2 Minimum pick-up differential phase element for all the zones.
IDCZ>2 Minimum pick-up differential phase element for the Check Zone.