Alstom MiCOM P846, Техническое руководство

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Symbols and Glossary P846/EN SG/D
MiCOM P846 (SG) 14-3
SG
Symbol Explanation
MCB
VT secondary circuits.
A “miniature circuit breaker”:
Used instead of a fuse to protect
N/A
Not applicable.
N/C A normally closed or “break” contact:
Often called a “form B” contact.
N/O ntact: A normally open or “make” co
Often called a “form A” contact.
NXT
ation.
Abbreviation of “Next”:
In connection with hotkey menu navig
O/P Abbreviation of “output”.
Opto put:
input.
An optocoupled logic in
Alternative terminology: binary
P1 the primary CT terminal polarity: Used in IEC terminology to identify
Replace by a dot when using ANSI standards.
P2 ary CT terminal polarity: Used in IEC terminology to identify the prim
The non-dot terminal.
PCB Printed circuit board.
Ph Abbreviation of “Phase”:
identify settings that relate to phase-phase faults. Used in distance settings to
PSL
figuration that can be modified by the user, using the
Programmable scheme logic:
The part of the relay’s logic con
graphical editor within S1 software.
Rev. flow in the “reverse” direction. Indicates an element responding to a
RMS The equivalent a.c. current:
Taking into account the fundamental, plus the equivalent heating effect of any
harmonics. Abbreviation of “root mean square”.
RP
rear of the relay.
Abbreviation of “Rear Port”:
The communication ports on the
Rx
mmunication receive line/pin.
Abbreviation of “Receive”:
Typically used to indicate a co
S1 minal polarity: Used in IEC terminology to identify the secondary CT ter
Replace by a dot when using ANSI standards.
S2 ndary CT terminal polarity: Used in IEC terminology to identify the seco
The non-dot terminal.
t A time delay.
TCS on. Trip circuit supervisi
TE A standard for measuring the width of a relay case:
One inch = 5TE units.
V Voltage.
V
0
Zero sequence voltage:
asured neutral/residual voltage. Equals one third of the me
V
1
Positive sequence voltage.
V
2
Negative sequence voltage.