METREL MI 2885, Manual

Page: 210 / 241

MI 2893 / MI 2892 / MI 2885 EN 50160 Standard Overview
210
230V
+10%
-15%
100%
Flicker severity Plt
Plt ≤ 1 2 h 1 Week 95%
Voltage unbalance u-
0 ÷ 2 %,
occasionally 3%
10 min 1 Week 95%
Total harm. distortion, THD
U
8% 10 min 1 Week 95%
Harmonic Voltages, Uh
n
See
Table 143:
Values of individual
harmonic voltages
at the supply
10 min 1 Week 95%
Mains signalling
See
Figure 177:
Mains signalling
voltage level limits
according to
EN50160
3 s 1 Day 99%
5.2.1 Power frequency
The nominal frequency of the supply voltage shall be 50 Hz, for systems with synchronous connection to
an interconnected system. Under normal operating conditions the mean value of the fundamental
frequency measured over 10 s shall be within a range of:
50 Hz ± 1 % (49,5 Hz .. 50,5 Hz) during 99,5 % of a year;
50 Hz + 4 % / - 6 % (i.e. 47 Hz .. 52 Hz) during 100 % of the time.
5.2.2 Supply voltage variations
Under normal operating conditions, during each period of one week 95 % of the 10 min mean U
Rms
values of the supply voltage shall be within the range of U
Nom
± 10 %, and all U
Rms
values of the supply
voltage shall be within the range of U
Nom
+ 10 % / - 15 %.
5.2.3 Supply voltage unbalance
Under normal operating conditions, during each period of one week, 95 % of the 10 min mean RMS
values of the negative phase sequence component (fundamental) of the supply voltage shall be within
the range 0 % to 2 % of the positive phase sequence component (fundamental). In some areas with
partly single phase or two-phase connected network users’ installations, unbalances up to about 3 % at
three-phase supply terminals occur.
5.2.4 THD voltage and harmonics
Under normal operating conditions, during each period of one week, 95 % of the 10 min mean values of
each individual harmonic voltage shall be less or equal to the value given in table below.
Moreover, THD
U
values of the supply voltage (including all harmonics up to the order 50) shall be less
than or equal to 8 %.
Table 143: Values of individual harmonic voltages at the supply
Odd harmonics Even harmonics
Not Multiples of 3 Multiples of 3
Order h Relative
voltage (U
N
)
Order h Relative voltage
(U
N
)
Order h Relative
voltage (U
N
)
5 6,0 % 3 5,0 % 2 2,0 %
7 5,0 % 9 1,5 % 4 1,0 %