Port machinery, lifts, cranes, winches, plastic extrusion plants, injection molding machines, and other industries lifts, stamping machines, elevators, crushers, conveyors and other of mine operations in the period of about a minute or so, the whole process needs to a large amount of non-functional, voltage fluctuations very quickly. Vintage reactive power compensation equipment inability to follow rapid changes in reactive power, running mostly in the under-compensated or overcompensated segment, less than ideal power factor indicators, not only prone to fine electricity loss is caused mainly due to waste a lot of energy . According to these fast changes in load characteristics, particularly the development of high and low pressure dynamic compensation device, the device uses an alternative general contactor thyristor switches with fast 20ms response switched capacitor advantage of being able to follow the changes in the system without instant success, in a very short period of time and determine the amount of change in the reactive system, because the zero voltage switching, no inrush current, eliminating the impact of the capacitor switching system, is the best of such load compensation device.