Power quality can be simply understood as the quality of power in power system. In general, the evaluation criteria of qualified power quality are: constant frequency, positive waveform and standard voltage, etc. But because the technology is not mature enough, the system often appears imperfect control, operation influence in the process of operation, external interference and various faults, as well as various problems in the process of power grid operation, extrusion equipment and power supply. Therefore, the power quality is dynamic, as long as it meets a certain range of changes, it is in line with international standards.
The power quality monitor can continuously monitor the power quality data such as harmonic content rate, total harmonic distortion rate, three-phase voltage unbalance, flicker, voltage deviation, voltage fluctuation, frequency, harmonic active power, reactive power, power factor, phase shift power factor, effective value, positive and negative sequence, transient events, etc.
The analysis of the monitoring data of power quality monitoring device can reflect the AC power quality supplied by the public power grid to the user's receiving end, the influence of various electrical equipment on the power quality of the public power grid under different operating conditions, and the dynamic monitoring of the power equipment adjustment and operation process, so as to help users solve the problems in the process of power equipment adjustment and operation. Monitor and analyze the dynamic parameters of power system, and make quantitative evaluation on the function and technical index of relevant equipment, so as to protect the power safety of important equipment in the system and avoid major accidents caused by power quality problems.
The whole network is divided into three parts: acquisition unit, substation monitoring and superior monitoring layer. The acquisition unit is the monitoring terminal, which transmits the data to the local monitoring system through Ethernet. Users can manage through the superior monitoring layer and local monitoring system.
