MeasurementPower quality monitoringdeviceImportant indicators:

1Voltage quality:Current quality refers to the deviation between the actual voltage and the ideal voltage,Reflect whether the electricity supplied by the power supply enterprise to users is qualified. The deviation here should be generalized, including amplitude, waveform, and phase. This definition includes most power quality issues,But it does not include power quality issues caused by frequency, norExcluding the impact and pollution of electrical equipment on the power quality of the power grid.

2Current quality:Reflects the changes in current that are closely related to voltage quality,In addition to the requirement of constant frequency and sinusoidal waveform for AC power supply, power users also require the current waveform to be in phase with the voltage to ensure high power factor operation. This definition contributes to the improvement of power quality in the power grid,And reduce line losses,But it cannot summarize most quality issues caused by voltage reasons.

3Power supply quality, electricity consumption quality, etc,These indicators collectively reflect the quality of electricity produced and transmitted by the power system,And electrical energy can be managed based on these indicators。In a general sense, power quality refers to the supply of electricity. But so far, it has been challengingPower quality monitoring deviceThere are still different understandings of the technical meaning of ", which is due to people's different perspectives on problems.For example, power companies may view power quality as simply voltage(deviation)And frequency(deviation)The qualification rate of the power system and the use of statistical data to illustrate the electrical energy of the power system9%It meets the quality requirements；Power users may generally view power quality as whether it is normal to supply power to the load。

AndPower quality monitoring deviceManufacturers believe that qualified power quality refers to the power supply characteristics, which fully meet the needs of normal design conditions for electrical equipment. However, in reality, the requirements for power supply characteristics may vary greatly among different manufacturers and equipment.On the other hand, the understanding of power quality is also constrained by the development level of the power system, especially the performance and structure of the electricity load.