488 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Appendix I EN 61000-4-30 Metering and Aggregation
Supply Voltage Unbalance
Supply voltage unbalance is evaluated by using the method of symmetrical
components, at the basic 10/12 cycle metering rate, and by using filtering to
minimize the effects of harmonics. Measurement uncertainty must be less than
±0.15% of both negative sequence ratio and zero-sequence ratio.
The 10/12 cycle results of positive, negative, and zero-sequence component
values on all voltage and current channels, and the 10/12 cycle results of voltage
and current percent unbalance, are returned in the
PowerQuality.EN61000_4_30_Sequence Data Table
. Three-second, 10 minute,
and 2-hour time aggregations of voltage unbalance are returned in the
PowerQuality.EN61000_4_30_Aggregation Data Table
.
Voltage Harmonics and Interharmonics
Harmonic and Interharmonic groups are measured by using the requirements of
IEC 61000-4-7, at the basic 10/12 cycle metering rate. Measurement accuracy is
specified as follows:
• For voltage and current harmonics, the measurement uncertainty is no
greater than ±1% of the measured fundamental voltage or current.
• The phase shift between individual channels must be less than h * 1°.
The PowerMonitor 5000 M8 model provides the following sets of harmonic
measurements in accordance with EN 61000-4-30.
• 10/12 cycle voltage and current IEEE and IEC THD, crest factor, and K-
factor, in the following data table:
– PowerQuality.EN61000_4_30_THD (M8 only)
• 10/12 cycle THD voltage THD of harmonic (THDS) and interhamonic
(TIHDS) subgroups, in the following data table:
– PowerQuality.EN61000_4_30_HSG (M8 only)
• Harmonic subgroup up to the 50th harmonic for voltage and current
updated every 10/12 cycles (200 mS). These results are reported in the
following data tables:
– PowerQuality.200mS_V1_N_Volts_RMS_HDS
– PowerQuality.200mS_V2_N_Volts_RMS_HDS
– PowerQuality.200mS_V3_N_Volts_RMS_HDS
– PowerQuality.200mS_VN_G_Volts_RMS_HDS
– PowerQuality.200mS_V1_V2_Volts_RMS_HDS
– PowerQuality.200mS_V2_V3_Volts_RMS_HDS
TIP You can also set up user-configurable voltage interruption detection in the
PowerMonitor 5000 M6 and M8 models. See
Sag and Swell Detection on
page 102.
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