E-Mon E-PS-S-HV-RTU - Manual (Page 227)

Appendix F EN50160 Evaluation and Recording
PowerSmart Socket Power Quality Meter 227
Voltage Unbalance
This characteristic defines the magnitude and/or phase
asymmetries of three-phase steady state supply voltage.
Method of Evaluation
The basic measurement is the RMS value of the steady state
voltage unbalance over a period of 10 minutes under normal
operating conditions. It is defined using the theory of
symmetrical
components by the negative sequence
component expressed in percent of the positive sequence
component.
Voltage unbalance is not evaluated if the supply voltage
crosses a voltage tolerance limit (±15% Un).
Target Values
The range of voltage unbalance given in the EN50160 is:
≤ 2% ( ≤ 3% in some areas) for 95% of a week
The voltage unbalance compliance limit can be changed in
the meter via the EN50160 PQ Recorder setup.
Harmonic Voltage
Method of Evaluation
The basic measurements are the individual harmonic voltage
distortion factors (HD) and the total harmonic distortion
factor (THD) over a period of 10 minutes under normal
operating conditions.
Harmonic voltages are evaluated by instrumentation
complying with IEC 61000-4-7. All calculations are made
relative to the nominal voltage.
The THD is evaluated including all harmonics up to the order
40. Harmonic voltages are evaluated up the order 25 since
the EN50160 provides target values for individual harmonic
voltages only for orders up to 25. The highest harmonic order
for evaluating individual harmonic voltages and THD can be
changed in the meter in the range of 25 to 50 via the
EN50160 Advanced Setup.
Harmonic voltages are not evaluated if the supply voltage
crosses a voltage tolerance limit (±15% Un).
Target Values
The ranges of harmonic voltages given in the EN50160 are:
• THD ≤ 8 % for 95% of a week
• Individual harmonic voltages shall be less than or equal to the
values given in Table 1 Clause 2.11 of the EN50160 for 95% of
a week.
The THD compliance limit can be changed in the meter via
the EN50160 PQ Recorder setup. The individual harmonic
voltage limits can be adjusted via the EN50160 Harmonics
setup.