The smr-em series power quality online monitoring device produced by our company is a high-end power quality data acquisition, analysis, storage and transmission online monitoring terminal to meet the intelligent demand. It can collect the electrical parameters of 10 monitoring channels (each monitoring channel contains a, B, C three-phase voltage and a, B, C three-phase current).

The power quality on-line monitoring instrument collects three-phase AC voltage and three-phase AC current. Through the unbalanced degree and transformation ratio of collected three-phase AC voltage and three-phase AC current, the voltage fluctuation, flicker, harmonic frequency, deviation and other data are analyzed. It realizes the analysis and processing of collected data, and generates various power and power quality reports, analysis curves, graphs and so on, so as to facilitate the analysis and research of electric energy.

The power grid is composed of five links of "generation, transmission, transformation, distribution and utilization", which consumes 80% of the total electric energy. With the development of social economy, more and more impulsive, nonlinear and unbalanced loads such as electrified railway and frequency converter are applied in power system. Power quality problems such as harmonics, negative sequence, flicker and voltage transient directly affect the power supply security of power system. Power can be regarded as a kind of commodity, and its quality problem is the common concern of suppliers and customers. It is necessary for power enterprises to establish online monitoring system of power quality to realize real-time monitoring of power quality of the whole distribution network.