Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 475
EN 50160 Conformance Tracking Appendix H
Rapid Voltage Changes
Long-time flicker severity P
lt
is measured over each 2-hour interval. The
following is the conformance specification for these measurements in low- and
medium-voltage systems:
•P
lt
must be less than or equal to 1 for 95% of each week
Supply Voltage Unbalance
Mean rms values of fundamental positive and negative sequence voltages are
measured each valid 10 minute interval. The following is the conformance
specification for these measurements in low- and medium-voltage systems:
• Negative sequence voltage within the range 0…2% of the positive sequence
voltage for 95% of each week
Harmonic Voltage
Mean rms values of each harmonic voltage are measured each valid 10 minute
interval. The following is the conformance specification for these measurements
in low-voltage systems:
• Harmonic voltage is less than or equal to the values listed in Table 228
(low-voltage) or Table 229
(medium-voltage) for 95% of each week
• Voltage THD including harmonics up to the 40th order is less than or
equal to 8%
Table 228 - Values of Individual Harmonic Voltages at the Supply Terminals for Orders up to 25
(1)
Given in Percent of the Fundamental Voltage
u1, Low-voltage Systems
Odd Harmonics Even Harmonics
Not Multiples of 3 Multiples of 3
Order h Relative Amplitude U
h
Order h Relative Amplitude U
h
Order h Relative Amplitude U
h
56.0%35.0%22.0%
75.0%91.5%41.0%
11 3.5% 15 0.5% 6…24 0.5%
13 3.0% 21 0.5%
17 2.0%
19 1.5%
23 1.5%
25 1.5%
(1) No values are given for harmonics of order higher than 25, as they are usually small, but largely unpredictable due to resonance effects.
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