Is it said that the power quality monitoring device in the power grid has the significance? 

Describe with a practical phenomenon: the night lights of a beautiful city are brilliant, all kinds of landscape lights are decorated, so many lights and urban electricity are a huge challenge to the power grid. Complex power environment and diverse power demand make the security and stability of power grid more stringent. It is very necessary to strengthen the monitoring and management of power quality no matter from the needs of power grid operation or the needs of users for power quality.

Modern society is the era of knowledge economy with information technology as the guide. In the past, many electrical equipment in the power system could work normally within the relatively large variation range of rated parameters. However, in the past decade, the development of information technology has led to the extensive use of computer-based, microprocessor-controlled electrical equipment and power electronic equipment in power supply and distribution system. Such equipment is more sensitive to grid fluctuations, so it also puts forward higher requirements for power quality.

Nowadays, industries that need to improve power quality include large industrial enterprises (automobile, steel, nonferrous metals, metallurgy, petroleum, electric power, etc.); new energy access (photovoltaic, wind power, energy storage, charging station, etc.); Data Center (Internet data center, financial data center); intelligent buildings (CBD, office buildings); rail transit (subway, maglev); large medical facilities Large scale aviation facilities; warehousing and logistics; port shore power; laboratory / laboratory, etc.

In order to ensure the security and stability of power grid, in addition to the construction of relevant hardware, online power quality monitoring is also very necessary. Power quality on-line monitoring device integrates harmonic analysis, flicker measurement, power measurement, unbalance measurement, fault recording, event recording and other functions, records steady-state data and transient data, and deeply excavates the cause of each event.

The non-linear load of harmonic source users causes the distortion of voltage waveform, on the one hand, the power supply quality drops sharply, which affects the consumers. On the other hand, the harmonic current returned by the user impacts the parallel compensation capacitance, which makes the compensation part sometimes unable to operate and the accidents occur constantly, which leads to the increase of line loss and the decrease of system operation stability.

The online power quality monitoring device can monitor the electrical parameters of 10 channels (each monitoring channel includes 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.