Variable-frequency system

The basic working principle of variable-frequency system is: the three-phase medium-voltage is connected through the medium-voltage switch cabinet, and the power is supplied to each power unit through the step-down, phase-shifting and isolation of the phase-shifting transformer. The power unit is a three-phase input and single-phase output H-bridge cascade structure,each phase is connected in series by N end-to-end H-bridge power units,the three-phase is connected into a Y-type directly output high voltage to supply power to motor stator.

6kV voltage level, with 5 units in cascaded connection to form one phase,and the phase-shifting transformer input side featuring 30 pulse rectification,when the system operates at 50Hz, the effective output voltage of each unit is 690V, and the phase voltage is 3450V, the line voltage is 6000V.

10kV voltage level,with 8 units in cascaded connection to form one phase,and the phase-shifting transformer input side featuring 48 pulse rectification. when the system operates at 50Hz, the effective output voltage of each unit is 690V, the phase voltage is 5520V, and the line voltage is 10000V.

Topologically structured with units connected to multiple electrical levels in series, modularized design, small size, compact structure, smooth and reliable performance.

Range : 160kW～20000kW（3～11kV）,0.75kW～630kW（380～ 690V） 

Size & Type : HVTDV-L series, HVTDV-F series, LVTDV 

Model : Medium voltage, low voltage 

Application : Fans, pumps, conveyor belts, mixers, elevators, etc. 

Industries : Steel & Iron works, electricity, petroleum, chemistry, coal mining, metallurgy, water purification, construction materials, etc.