Glossary
176 USER MANUAL FPC 200 - 3/2017
NRT - Non-real time.
NS – Negative sequence.
NVD – Neutral voltage displacement.
OC – Overcurrent.
OCE – Overcurrent earth.
OF – Overfrequency.
OV – Overvoltage.
PPV – Peak to peak voltage.
PS – Power supply.
PSUV – Positive sequence under voltage.
REF – Restricted earth fault.
RJ45 – Registered jack 45.
ROCOF – Rate of change of frequency.
RS-232 – Recommended standard defining the electrical characteristics of drivers and receivers for use in serial
communication systems.
RS-485 – Recommended standard defining the electrical characteristics of drivers and receivers for use in serial
communication systems.
RT – Real time.
RTC – Real-time clock.
RTU – Remote terminal unit.
RUV – Remanent undervoltage.
Screw connector – Moving clamp connector.
SPH – Starts per hour.
ST connector – Type of optical fibre connector.
TCS – Trip circuit supervision.
TO – Thermal overload.
U – AC Voltage input.
U
0
– Zero sequence voltage of symmetrical components calculation.
U
1
– Positive sequence voltage of symmetrical components calculation.
U
2
– Negative sequence voltage of symmetrical components calculation.
UC – Undercurrent.
U
e_n
– Secondary rated phase voltage of VT.
U
e_pri
– Primary rated phase voltage of VT.
UF – Underfrequency.
U
m
– Measured voltage.
U
m_min
– Minimal measured voltage.
U
n
– Nominal voltage, secondary rated phase to phase voltage of VT.
U
p
– Pickup voltage.
U
pri
– Primary rated phase to phase voltage of VT.
USB – Universal serial bus.
UV – Undervoltage.
VT – Voltage transformer.
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