P44x/EN SG/ Hb
MiCOM P40 Agile P442, P444
(SG) 13-
Symbols Explanation
N/O A normally open or “make” contact:
Often called a “form A” contact.
NCIT Non Conventional Instrument Transformer
NIC Network Interface Card:
i.e. the Ethernet card of the IED
NPS Negative phase sequence.
NVD Neutral voltage displacement:
Equivalent to residual overvoltage protection.
NXT Abbreviation of “Next”:
In connection with hotkey menu navigation.
o
A small circle on the input or output of a logic gate:
Indicates a NOT (invert) function.
O/C Abbreviation of “Overcurrent”.
O/P Abbreviation of “output”.
O/V Abbreviation of “Overvoltage”
Opto An optocoupled logic input:
Alternative terminology: binary input.
P1 Used in IEC terminology to identify the primary CT terminal polarity:
Replace by a dot when using ANSI standards.
P2 Used in IEC terminology to identify the primary CT terminal polarity:
The non-dot terminal.
PCB Printed circuit board.
Ph Abbreviation of “Phase”:
Used in distance settings to identify settings that relate to phase-phase faults.
PICS Protocol Implementation Conformance Specification:
Defines the IEC 61850 services implemented in an IED, with reference to the ACSI.
PLC Power Line Carrier or Power Line Communication
PN> Wattmetric earth fault protection:
Calculated using residual voltage and current quantities.
Pol Abbreviation of “Polarizing”:
Typically the polarizing voltage used in making directional decisions.
POP Permissive Overreach Protection
PUP Permissive Underreach Protection
BOP Blocking Overreach Protection
PCB Printed Circuit Board
PSL
Programmable Scheme Logic: The part of the relay’s logic configuration that can be modified by
the user, using the graphical editor within MiCOM S1 Studio software.
Qx Isolator number x (from 1 to 6).
R A resistance.
R Gnd. A distance zone resistive reach setting:
Used for ground (earth) faults.
RBN Lead burden for the neutral.
RBPh Lead burden for the phases.
RCA Abbreviation of “Relay Characteristic Angle”:
The centre of the directional characteristic.
RCT Current Transformer secondary resistance.
REF Restricted earth fault protection.
Rev. Indicates an element responding to a flow in the “reverse” direction.
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