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COMTRADE files are typically generated by Intelligent Electronic Devices , such as an electronic protective relay, in electrical substations during power systems disturbances. These IEDs monitor the electrical characteristics of the power system by digitally sampling measurements of the current, voltage, power, frequency, etc. at a high speed.
Users of PQDIF files include meter manufacturers, electric utility company engineers, [3] and commercial/industrial consumers of electric power. PQDIF is defined in a "recommended practice" standard maintained by the IEEE PQDIF Task Force, [ 4 ] which is sponsored by the Transmission & Distribution Committee of the IEEE Power & Energy Society .
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Electric power quality is the degree to which the voltage, frequency, and waveform of a power supply system conform to established specifications. Good power quality can be defined as a steady supply voltage that stays within the prescribed range, steady AC frequency close to the rated value, and smooth voltage curve waveform (which resembles a sine wave).
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It measures power quality of AC mains for different voltage levels as described in common EMC test standards. By definition, the AC harmonic is a multiple of the electrical quantity (voltage or current) at multiples of the fundamental frequency of the system, produced by the action of non-linear loads such as rectifier , lighting , or saturated ...
The site is updated approximately every 2 minutes with worldwide power quality and energy recordings. Data from these PQubes can be used, for example, for developing and testing power quality algorithms. [11] [12] [13] Available data include daily, weekly, and monthly files in GIF and Microsoft Excel CSV format. Voltage and current ...