| Abstract |
This paper presents a complex VIRTUAL INSTRUMENT (VI) for harmonic and power analysis
using the graphic programming system LabVIEW. For the acquisition of the measuring data a data
acquisition card with a simultaneous sampling for each single measuring channel is applied.
In particular, VI’s for a long time measurement with an integrated digital flickermeter (above all for
the analysis of line voltage) and for the statistical evaluation are introduced.
A further VI included a short time recorder for an offline measurement with a triggerable recording of
measuring data for the acquisition of fast changing harmonics. Relevant characteristics are calculated
and stored by means of an additional VI for the inspection of the recorded sampling data. A single,
clocked or continous storage of characteristics is possible in accordance with appropriate regulations.
The presentation of these characteristics in variation with time and additional evaluations are possible
by means of an integrated VI.
A VI for quasi online measurements allows the acquisition and presentation of characteristics in steady
state respectively quasi stationary operating conditions.
The comparison of measuring results, won by VI’s, with results of commercial measuring instruments
has shown a very good conformity. |
