1 Introduction
10
P
lt
Long term flicker (2 hours) including P
lt
pg
(phase p to phase g long term
voltage flicker) and P
lt
p
(phase p to neutral long term voltage flicker). See
5.1.9 for definition.
P
st
Short term flicker (10 minutes) including P
st
pg
(phase p to phase g short
term voltage flicker) and P
st
p
(phase p to neutral voltage flicker). See 5.1.9
for definition.
P
st1min
Short term flicker (1 minutes) including P
st1min
pg
(phase p to phase g short
term voltage flicker) and P
st1min
p
(phase p to neutral voltage flicker). See
5.1.9 for definition.
±
Q, Q
i+
,
Q
c+
, Q
i-
,
Q
c-
Reactive power including Q
p
(phase p reactive power) and Q
tot
(total
reactive power). Minus sign indicates generated power and plus sign,
indicate consumed power. Inductive reactive character is marked with “i”
and capacitive reactive character is marked with “c”. See 5.1.5 and 5.1.6
for definition.
S, S
+
, S
-
Apparent power including S
p
(phase p active power) and S
tot
(total
apparent power). See 5.1.5 and 5.1.6 for definition. Minus sign indicates
apparent power during generation and plus sign indicate apparent power
during consumption. See 5.1.5 and 5.1.6 for definition.
THD
I
total harmonic distortion current related to fundamental, including THD
Ip
(phase p current THD) and THD
IN
(neutral current THD). See 5.1.8 for
definition
THD
U
total harmonic distortion voltage related to fundamental, including THD
Upg
(phase p to phase g voltage THD) and THD
Up
(phase p to neutral voltage
THD). See 5.1.10 for definition.
u
-
Negative sequence voltage ratio (%). See 5.1.10 for definition.
u
0
Zero sequence voltage ratio (%). See 5.1.10 for definition.
U, U
Rms
RMS voltage, including
U
pg
(phase p to phase g voltage) and
U
p
(phase p
to neutral). See 5.1.2 for definition.
U
+
Positive sequence voltage component on three phase systems. See
5.1.10 for definition.
U
-
Negative sequence voltage component on three phase systems. See
5.1.10 for definition.
U
0
Zero sequence voltage component on three phase systems. See 5.1.10
for definition.
U
Dip
Minimal U
Rms(1/2)
voltage measured during dip occurrence
U
Fnd
Fundamental RMS voltage (Uh
1
on 1
st
harmonics), including
U
pgFnd
(phase
p to phase g fundamental voltage) and
U
pFmd
(phase p to neutral
fundamental voltage). See 5.1.8 for definition
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.
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
