Community Research and Development Information Service - CORDIS

Power quality monitoring

Controlling electrical disturbances is essential in order to safeguard electrical equipment. The development of a voltage quality analyser by an Andalusian research group has made this possible.
Power quality monitoring
INVESPOT has developed a virtual Power Quality Meter, which allows the accurate measurement of the instantaneous frequency and harmonic content of three-phase voltage waveforms and their symmetrical components. These parameters are used to classify electrical disturbances ands assess any deterioration in the quality of the power.

The system consists of a number of voltage transducers and is PC controlled through the installation of a software control program and a data acquisition card in the PC. It is connected to the mains, where it monitors the stability in frequency, the degree of distortion of the signals, and the symmetry of the signals. The results are displayed on graphs, which give the instantaneous frequency variations, with distorted and noisy signals, with a precision of 0.01%. The harmonics are also displayed in the form of voltage-phasers and the equivalent total harmonic distortion (THD) of the three phase voltages. Three instantaneous phase-voltage signals and their respective instantaneous symmetrical components are also depicted.

The device gives on-line monitoring and can be adapted to meet the required accuracy of the system being monitored and is low in cost. It would be most useful for electrical companies and the manufacturers of electronic and electromechanical equipment and for industrial production plants. A prototype has been developed. Partners are sought to collaborate on the design and development of industrial prototypes.
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