The power quality online monitoring device can monitor harmonics online. It is necessary to know the specific harmonic data of the system whether it is to thoroughly treat the harmonic in the system or to isolate and purify the key equipment. Therefore, it is more reasonable to recommend the user to carry out harmonic monitoring first and then determine the specific implementation scheme.

With the wide use of power electronic devices, the nonlinear load is increasing, and the harmonic content in the power grid is also rising. Harmonic pollution poses a potential threat to the safety, stability and economic operation of the power system, and has a great impact on the surrounding electrical environment. For example, it consumes the reactive power reserve of the power system, increases the additional harmonic consumption of the motor, makes it hot and shortens its service life, causes large errors in the measurement of electric energy, causes the work disorder of important and sensitive automatic control and protection devices, increases the phenomenon of maloperation and cabinet operation, and leads to the decrease of reliability, etc.

      One of the functional features of the power quality monitor is that it can make statistical analysis on the recorded historical data and view the record charts of each parameter, including: historical statistical data, three-phase voltage effective value, three-phase current effective value, three-phase voltage imbalance, three-phase current imbalance, each harmonic voltage content, harmonic current content, active power, reactive power Apparent power, value of power factor, and value of frequency and flicker.

      Through the power quality monitoring device, we can fully and accurately understand the operation of the whole power supply network system, and can quantitatively analyze the harmonic content, active use, reactive loss, power factor, voltage change, flicker interference, three-phase imbalance and other specific parameter indicators of the enterprise power grid system, and input the parameters to the supporting online monitoring device, which can form A complete power quality analysis report can not only accurately reflect the "health" status of the whole power grid system, but also diagnose the problems affecting energy conservation and consumption reduction and the extent to which it can be optimized. Based on this, engineers and technicians can provide implementation schemes for harmonic control, reactive power optimization, dynamic compensation, etc, Help enterprises to realize the development goals of safe and stable operation of power grid system and energy saving and consumption reduction, and promote the reduction of energy consumption cost and improvement of economic benefits.