1.Safely improve power factor, avoid power factor’s examination penalty from power supply department;
2. Save energy and reduce consumption, reduce operation cost
3. Reduce damage from harmonic to electric device, secure the steady operation of distribution device and reactive power compensation device
4. Increase the using efficiency of system capacitance and distribution device
The main electric devices of metal cold rolling is rolling machine. Rolling machine drags the DC motor, DC motor transfers the AC by bridge rectifier to DC to supply power. As the motor load varies during metal rolling, the harmonic which rectifier produces changed between 3, 5, 7times , besides, the reactive power consumption is changing synchronously.
Other auxiliary motors of rolling consumes reactive power, it produces less harmonic.
The main electric devices of metal cold rolling is rolling machine. Rolling machine drags the DC motor, DC motor transfers the AC by bridge rectifier to DC to supply power. As the motor load varies during metal rolling, the harmonic which rectifier produces changed between 3, 5, 7times , besides, the reactive power consumption is changing synchronously.
Other auxiliary motors of rolling consumes reactive power, it produces less harmonic.
Suggestion is to use passive filter+ fast filter compensation to conduct local centralized harmonic control and reactive power compensation:
1.Use passive filter to conduct local harmonic control and reactive power compensation on rolling beside rectifier
2.Use fast filter compensation to centralized harmonic control other devices