SATEC SA300 ezPAC Operation Manual - Manual (Page 101)

Chapter 8 Configuring Recorders Configuring the EN50160 Power Quality Recorder
SA300 Substation Automation Unit 101
Statistical Survey
The SA300 provides the statistical evaluation of transient overvoltages using the
classification recommended by Eurelectric’s Measurement guide for voltage
characteristics. Transient overvoltages are classified by voltage magnitude as shown
in Appendix D.
Indicative Values
Temporary overvoltages in LV systems will generally not exceed 6 kV peak, but
higher values occur occasionally.
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 device 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.
THD is evaluated including all harmonics up to the order 40. Harmonic voltages are
evaluated up to 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 device 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 in Clause 2.11 of the EN50160 for 95% of a week.
The THD compliance limit can be changed in the device via the EN50160 PQ
Recorder setup. The individual harmonic voltage limits can be adjusted via the
EN50160 Harmonics setup.