Every big city's night lights are brilliant, there is no tired atmosphere, all kinds of landscape lights decorate the beautiful city, so many lights and city power consumption are also a great challenge to the power grid. The complex electricity environment and diverse electricity demand make the security and stability of power grid more strict. It is necessary to strengthen the monitoring and management of power quality, no matter from the needs of power grid operation or from the needs of users for power quality.

For the security and stability of the power grid, in addition to the construction of the relevant hardware by the power grid company itself, online monitoring of power quality is also very necessary. Power quality online monitoring device integrates harmonic analysis, flicker measurement, power measurement, unbalance measurement and fault recording, event recording and other functions. It records steady-state data and transient data, and deeply digs the cause of each event.

The harmonic source user's nonlinear load causes voltage waveform distortion. On the one hand, the quality of power supply drops sharply, which affects the power customers. On the other hand, the harmonic current returned by the user impacts the parallel compensation capacitor, which sometimes makes the compensation part unable to be put into operation and accidents occur continuously, resulting in the increase of line loss and the decline of system operation stability.

The on-line power quality monitoring device can monitor the electrical parameters of 10 channels (each channel contains A, B, C three-phase voltage and A, B, C three-phase current). It can provide customized power quality monitoring scheme for users to adapt to various scenarios.