MI 2893 / MI 2892 / MI 2885
Abbreviations
27
Uh
N
,
n
th
voltage RMS harmonic component including U
pg
h
N
(phase p to
phase g voltage n
th
RMS harmonic component) and U
p
h
N
(phase p to
neutral voltage n
th
RMS harmonic component). See 5.1.8 for
definition.
Uih
N
n
th
voltage RMS interharmonic voltage component including U
pg
ih
N
(phase p to phase g voltage n
th
RMS interharmonic component) and
U
p
ih
N
(phase p to neutral voltage n
th
RMS interharmonic
component). See 5.1.8 for definition.
U
Int
Minimal U
Rms(1/2)
voltage measured during interrupt occurrence.
U
Nom
Nominal voltage, normally a voltage by which network is designated
or identified.
U
Over
Voltage over-deviation, difference between the measured value and
the nominal value of a voltage, only when the measured value is
greater than the nominal value. Voltage over-deviation measured
over recorded interval, expressed in % of nominal voltage including
U
pgOver
(phase p to phase g voltage) and U
pOver
(phase p to neutral
voltage). See 5.1.12 for details.
U
Pk
Peak voltage, including U
pgPk
(phase p to phase g voltage) and U
pPk
(phase p to neutral voltage)
U
Rms(1/2)
RMS voltage refreshed each half-cycle, including U
pgRms(1/2)
(phase p
to phase g half-cycle voltage) and U
p
Rms(1/2)
(phase p to neutral half-
cycle voltage). See 5.1.12 for definition.
U
Swell
Maximal U
Rms(1/2)
voltage measured during swell occurrence.
U
Sig
Mains signalling RMS voltage, including U
Sigpg
(phase p to phase g
half-cycle signalling voltage) and U
Sig
p
(phase p to neutral half-cycle
signalling voltage). Signalling is a burst of signals, often applied at a
non-harmonic frequency, that remotely control equipment. See
5.2.6 for details.
U
Under
Voltage under-deviation, difference between the measured value
and the nominal value of a voltage, only when the voltage is lower
than the nominal value. Voltage under-deviation measured over
recorded interval and expressed in % of nominal voltage, including
U
pgUnder
(phase p to phase g voltage) and U
pUnder
(phase p to neutral
voltage). See 5.1.12 for details.
∆U
max
Maximum absolute difference between any of the U
Rms(1/2)
values
during the RVC event and the final arithmetic mean 100/120 U
Rms(1/2)
value just prior to the RVC event. For poly-phase systems, the ∆U
max
is the largest ∆U
max
on any channel. See 5.1.15 for details.
∆U
ss
Absolute difference between the final arithmetic mean
100/120 U
Rms(1/2)
value just prior to the RVC event and the first
arithmetic mean 100/120 U
Rms(1/2)
value after the RVC event. For
poly-phase systems, the ∆U
ss
is the largest ∆U
ss
on any channel. See
5.1.15 for details.
