MI 2883 Energy Master
Introduction
18
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
5.1.11 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
underdeviation,
difference
between
the
measured value and the nominal value of a voltage, only
when the voltage is lower than the nominal value. Voltage
underdeviation 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 5.1.11 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 5.1.14 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 5.1.14 for details.
