What is the dynamic compensation of 2450mm four-high reversible hot rolling mill?

The DC mill adopts six-pulse rectifier technology, so the harmonics generated by the low-voltage winding side of the rectifier transformer are mainly 5, 7, 1 1, 13 times. In order to ensure the normal operation, reliable power supply and energy saving of power supply system equipment, technical measures must be taken to suppress harmonic current and consider compensating reactive power. Ordinary capacitor bank compensation can't track the load change in real time for effective compensation, and the mechanical contacts are easily damaged due to frequent switching, which has a great impact on the power grid. The low-voltage dynamic reactive power compensation device has the characteristic of dynamically following the load change, which can effectively improve the power quality and power factor of the power grid, save power, improve the reliability of the whole power system and the operation efficiency of equipment, reduce the operation cost and equipment maintenance cost, prolong the service life of equipment and bring obvious economic benefits to users.

This scheme is used for compensation of low-voltage 0.4kV rolling mill, and the installation capacity is 1 100kvar, and * * * is divided into 22 roads, each with 50kvar. Choose 0.48kV, 50Hz, 50kvar three-phase parallel capacitors, and adopt equal capacitance * * * compensation mode; Three-phase dry reactor with rated reactance rate of 7% is adopted; The fast SCR switch is used for switching (the response speed is less than 20ms) and tracking the rapid change of load in real time; When the system voltage is 0.4kV, the actual output capacity is about 82 1kvar (capacitive).