All kinds of power events in power grid often indicate some abnormal quality of power grid. Timely finding these abnormalities and taking corresponding measures will be of great help to ensure the quality of power grid and reduce the economic losses and accidents caused by abnormal conditions. On the contrary, if we can't find the abnormal power events in the power grid in time and deal with them in time, it will cause serious safety accidents.

The influence of power quality on military industry, precision instrument processing industry, aerospace, railway transportation, communication and other industries is particularly obvious.

Traditional quality analysis instrument and new online power quality detection device

The traditional power event analysis has the following characteristics：

Generally, it is carried out by hand-held or portable instruments;When the analysis of grid data is needed, the operation and maintenance personnel first carry the power energy detector to the power grid field for wiring, collecting data and then exporting it for analysis.

Because of the need for field operation, field collection and export analysis, there are many shortcomings in its safety (there is electric shock hazard), convenience (data collection waiting on site), timeliness (analysis results lag behind), etc. For finding out the abnormal power in power grid, there is obvious time lag phenomenon. It is often that abnormal events occur and cause significant economic losses before time and money are spent to monitor the quality of power grid.

With the development of power electronics technology, the use of nonlinear load leads to the harmonic exceeding the standard, three-phase imbalance, and many power quality problems such as voltage sag and impact current caused by impact load have a great impact on the power grid. The traditional power monitoring method can not meet the requirements of the current security, real-time, high efficiency and rapid monitoring of power grid.