GE P444

P
44x/EN SG/ Hb6
Symbols and Glossary
(SG) 1
3-8 MiCO
M P40 Agile P442, P444
Symbols Explanation
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 Abbreviation of “Rear Port”:
The communication ports on the rear of the relay.
Rx Abbreviation of “Receive”:
Typically used to indicate a communication receive line/pin.
S1 Used in IEC terminology to identify the secondary CT terminal polarity:
Replace by a dot when using ANSI standards.
S2 Used in IEC terminology to identify the secondary CT terminal polarity:
The non-dot terminal.
SCADA Supervisory Control and Data Acquisition
remote communications interfaces of the MiCOM relay
SCL Substation Configuration Language:
In IEC 61850, the definition of the configuration files.
SCSM Specific Communication Service Mappings:
In IEC 61850, the SCSMs define the actual information exchange mechanisms currently used
(e.g. MMS).
SDEF Sensitive Differential Earth Fault Protection.
SEF Sensitive Earth Fault Protection.
SNTP Simple Network Time Protocol
used to synchronize the internal real time clock of the relays
SOTF Switch On To Fault
SSD Solid State Device
SV
Sample Value
Digital values obtained from the analog to digital conversion of a measured voltages and
currents (used with Ethernet NCIT board)
T A time delay.
TCS Trip circuit supervision.
TD The time dial multiplier setting:
Applied to inverse-time curves (ANSI/IEEE).
TE A standard for measuring the width of a relay case:
One inch = 5TE units.
TMS The Time Multiplier Setting applied to inverse-time curves (IEC).
TOR Trip On Reclose
tZ
Tx Abbreviation of “Transmit”:
Typically used to indicate a communication transmit line/pin.
V Voltage.
V< An undervoltage element.
V<1 First stage of undervoltage protection:
Could be labelled 27-1 in ANSI terminology.
V<2 Second stage of undervoltage protection:
Could be labelled 27-2 in ANSI terminology.
V> An overvoltage element.
V>1 First stage of overvoltage protection:
Could be labelled 59-1 in ANSI terminology.
V>2 Second stage of overvoltage protection:
Could be labelled 59-2 in ANSI terminology.