This standard specifies tech-regulations and verification method etc. of power quality analyzer.
This standard is applicable to verification of power quality measurement function of newly-produced and engaged power quality analyzer and multifunctional measurer as well as the verification of measurement error of the voltage monitor.
This standard is not applicable to verification of transient harmonics.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.
GB 12326-2000 Power Quality-Voltage Fluctuation and Flicker
GB/T 14549-1993 Quality of Electric Energy Supply-Harmonics in Public Supply Network"
GB/T 15543-1995 Quality of Electric Energy Supply-Admissible Three-phase Voltage Unbalance Factor
GB/T 19862-2005 General Requirements for Monitoring Equipments of Power Quality
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement
IEC 61000-4-7:2002 Electromagnetic Compatibility-Testing and Measurement Techniques-General Guide on Harmonics and Interharmonics Measurements and Instrumentation for Power Supply Systems and Equipment Connected Thereto
IEC 61000-4-15:1997 Electromagnetic Compatibility-Testing and Measurement Techniques-Flickermeter-Functional and Design Specifications
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
Fundamental
Component sine waves of the frequency of public period obtained by Fourier series decomposition of periodical AC capacity.
3.2
Harmonic
Component of frequency as non-fundamental frequency obtained by decomposing the periodicity alternating current component. Therein, the component with frequency being integral multiple of fundamental is called as integer harmonic; if the component with frequency as non-integral multiple of fundamental and fractional component of frequency less than fundamental frequency is called as interharmonic.
3.3
Harmonic content
Amount obtained by deducting fundamental component from periodicity alternating current component.
[see GB/T 14549-1993, 3.6]
3.4
Harmonic ratio
Ratio of the root-mean-square value of the harmonic component h included in periodicity alternating current component to that of the fundamental component (expressed in percent).
[see GB/T 14549-1993, 3.7]
3.5
Harmonic order h
Ratio of harmonic frequency to fundamental frequency.
3.6
Harmonic power
Product of the harmonic voltage, harmonic current h and the harmonic power factor of this order.
3.7
Harmonic phase
Phase of the harmonic voltage, harmonic current of the same order.
3.8
Unbalance factor ε
Unbalanced degree of three-phase in the three phase power system and shall be represented by root mean square value percentage of negative-sequence component and positive-sequence component of voltage or current.
[see GB/T 15543-1995, 2.1]
3.9
Positive-sequence component
Component of the positive sequence symmetric system, when the electric quantity of the unbalanced three-phase system is decomposed according to the symmetrical component method.
[see GB/T 15543-1995, 2.2]
3.10
Negative-sequence component
Component of the negative-sequence symmetric system, when the electric quantity of the unbalanced three-phase system is decomposed according to the symmetrical component method.
[see GB/T 15543-1995, 2.3]
3.11
Flicker
Visual sense caused by instable illumination.
[see GB 12326-2000, 3.9]
3.12
Short term severity Pst
One statistic value to judge flicker degree in a short term (several minutes). Pst=1 is the limit to usually cause the visual sense irritation.
[see GB 12326-2000, 3.11]
3.13
Long term severity Pit
Quantity value to reflect flicker degree for a long term (several hours) and deduced by short term severity Pst.
[see GB 12326-2000, 3.12]
