P44x/EN SG/ Hb
MiCOM P40 Agile P442, P444
(SG) 13-
Symbols Explanation
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.
IDMT Inverse definite minimum time:
A characteristic whose trip time depends on the measured input (e.g. current) according to an
inverse-time curve.
IDN>1 Minimum pick-up neutral circuitry fault threshold.
IDN>2 Minimum pick-up differential neutral element for all the zones.
IDNCZ>2 Minimum pick-up differential neutral element for the Check Zone.
IDZ Minimum pick-up differential neutral element for the Check Zone.
IEC
International Electrotechnical Commission (organization that prepares and publishes
International Standards for all electrical, electronic and related technologies)
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